首页 > 最新文献

Atoms最新文献

英文 中文
Quasi-Static Lineshape Theory for Rydberg Excitations in High-Density Media 高密度介质中Rydberg激发的准静态线形理论
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-15 DOI: 10.3390/atoms11060095
Trevor Scheuing, J. Pérez-Ríos
This work presents a theoretical approach for lineshapes of Rydberg excitations in high-density media. In particular, we introduce the quasi-static lineshape theory, leading to a methodic and general approach, and its validity is studied. Next, using 84Sr as a prototypical scenario, we discuss the role of the thermal atoms and core–perturber interactions, generally disregarded in Rydberg physics. Finally, we present a characterization of the role of Rydberg–core perturber interactions based on the density and principal quantum number that, beyond affecting the lineshape, could potentially apply to chemi-ionization reactions responsible for the decay of Rydberg atoms in high-density media.
本文提出了高密度介质中里德堡激励线形的理论方法。特别地,我们引入了准静态线形理论,给出了一种方法和一般方法,并对其有效性进行了研究。接下来,我们以84Sr为原型,讨论了热原子和核心-摄动器相互作用的作用,这在里德伯物理中通常被忽视。最后,我们提出了基于密度和主量子数的里德堡核微扰相互作用的特征,除了影响线形外,还可以潜在地应用于高密度介质中导致里德堡原子衰变的化学电离反应。
{"title":"Quasi-Static Lineshape Theory for Rydberg Excitations in High-Density Media","authors":"Trevor Scheuing, J. Pérez-Ríos","doi":"10.3390/atoms11060095","DOIUrl":"https://doi.org/10.3390/atoms11060095","url":null,"abstract":"This work presents a theoretical approach for lineshapes of Rydberg excitations in high-density media. In particular, we introduce the quasi-static lineshape theory, leading to a methodic and general approach, and its validity is studied. Next, using 84Sr as a prototypical scenario, we discuss the role of the thermal atoms and core–perturber interactions, generally disregarded in Rydberg physics. Finally, we present a characterization of the role of Rydberg–core perturber interactions based on the density and principal quantum number that, beyond affecting the lineshape, could potentially apply to chemi-ionization reactions responsible for the decay of Rydberg atoms in high-density media.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43088986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Attosecond Time Delay Trends across the Isoelectronic Noble Gas Sequence 等电子惰性气体序列的阿秒时延趋势
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-15 DOI: 10.3390/atoms11050084
Brock Grafstrom, A. Landsman
The analysis and measurement of Wigner time delays can provide detailed information about the electronic environment within and around atomic and molecular systems, with one the key differences being the lack of a long-range potential after a halogen ion undergoes photoionization. In this work, we use relativistic random-phase approximation to calculate the average Wigner delay from the highest occupied subshells of the atomic pairings (2p, 2s in Fluorine, Neon), (3p, 3s in Chlorine, Argon), (4p, 4s, 3d, in Bromine, Krypton), and (5p, 5s, 4d in Iodine, Xenon). The qualitative behaviors of the Wigner delays between the isoelectronic pairings were found to be similar in nature, with the only large differences occurring at photoelectron energies less than 20 eV and around Cooper minima. Interestingly, the relative shift in Wigner time delays between negatively charged halogens and noble gases decreases as atomic mass increases. All atomic pairings show large differences at low energies, with noble gas atoms showing large positive Wigner delays, while negatively charged halogen ions show negative delays. The implications for photoionization studies in halide-containing molecules is also discussed.
维格纳时间延迟的分析和测量可以提供有关原子和分子系统内部和周围电子环境的详细信息,其中一个关键区别是卤素离子经历光离后缺乏远程电势。在这项工作中,我们使用相对论随机相位近似来计算原子对(氟、氖中的2p、2s)、(氯、氩中的3p、3s)、(溴、氪中的4p、4s、3d)和(碘、氙中的5p、5s、4d)的最高占据亚壳层的平均维格纳延迟。发现等电子对之间的Wigner延迟的定性行为在本质上是相似的,只有在光电子能量小于20 eV和库珀最小值附近发生较大差异。有趣的是,带负电荷的卤素和惰性气体之间的维格纳时间延迟的相对位移随着原子质量的增加而减小。所有的原子对在低能时表现出很大的差异,稀有气体原子表现出很大的正维格纳延迟,而带负电的卤素离子表现出负延迟。对含卤化物分子的光电离研究的意义也进行了讨论。
{"title":"Attosecond Time Delay Trends across the Isoelectronic Noble Gas Sequence","authors":"Brock Grafstrom, A. Landsman","doi":"10.3390/atoms11050084","DOIUrl":"https://doi.org/10.3390/atoms11050084","url":null,"abstract":"The analysis and measurement of Wigner time delays can provide detailed information about the electronic environment within and around atomic and molecular systems, with one the key differences being the lack of a long-range potential after a halogen ion undergoes photoionization. In this work, we use relativistic random-phase approximation to calculate the average Wigner delay from the highest occupied subshells of the atomic pairings (2p, 2s in Fluorine, Neon), (3p, 3s in Chlorine, Argon), (4p, 4s, 3d, in Bromine, Krypton), and (5p, 5s, 4d in Iodine, Xenon). The qualitative behaviors of the Wigner delays between the isoelectronic pairings were found to be similar in nature, with the only large differences occurring at photoelectron energies less than 20 eV and around Cooper minima. Interestingly, the relative shift in Wigner time delays between negatively charged halogens and noble gases decreases as atomic mass increases. All atomic pairings show large differences at low energies, with noble gas atoms showing large positive Wigner delays, while negatively charged halogen ions show negative delays. The implications for photoionization studies in halide-containing molecules is also discussed.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45443241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stabilizing Frequency of a Diode Laser to a Reference Transition of Molecular Iodine through Modulation Transfer Spectroscopy 用调制转移光谱法稳定二极管激光器对分子碘参考跃迁的频率
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-12 DOI: 10.3390/atoms11050083
L. Sharma, A. Roy, S. Panja, S. De
We report the frequency stabilization of an external cavity diode laser (ECDL) to a reference molecular iodine (I2) transition at 13,531.18 cm−1 (739.03382 nm). Using the Modulation Transfer Spectroscopy (MTS) method for the highly sensitive detection of weak absorption signals, the Doppler-free absorption peaks of I2 corresponding to the hot band transition R(78) (1–11) are resolved. The ECDL’s frequency is stabilized with respect to one of the lines lying within the reference absorption band. For this, the iodine vapor cell is heated to 450 °C and the corresponding circularly polarized pump and probe beam powers are maintained at 10 mW and 1 mW, respectively, to avoid power broadening. The short (100 ms) and long-term (50 h) linewidths of the frequency stabilized laser are measured to be 0.75(3) MHz and 0.5(2) MHz, respectively, whereas the natural linewidth of the specific I2-transitions lie within a range of tens of MHz.
我们报道了外腔二极管激光器(ECDL)在13531.18 cm-1(739.03382 nm)处对参考分子碘(I2)跃迁的频率稳定。使用调制转移光谱(MTS)方法对弱吸收信号进行高灵敏度检测,解析了对应于热带跃迁R(78)(1-11)的I2的无多普勒吸收峰。ECDL的频率相对于位于参考吸收带内的一条线是稳定的。为此,将碘蒸气池加热至450°C,并将相应的圆偏振泵浦和探测光束功率分别保持在10mW和1mW,以避免功率加宽。测得频率稳定激光器的短(100ms)和长(50H)线宽分别为0.75(3)MHz和0.5(2)MHz,而特定I2跃迁的自然线宽在几十MHz的范围内。
{"title":"Stabilizing Frequency of a Diode Laser to a Reference Transition of Molecular Iodine through Modulation Transfer Spectroscopy","authors":"L. Sharma, A. Roy, S. Panja, S. De","doi":"10.3390/atoms11050083","DOIUrl":"https://doi.org/10.3390/atoms11050083","url":null,"abstract":"We report the frequency stabilization of an external cavity diode laser (ECDL) to a reference molecular iodine (I2) transition at 13,531.18 cm−1 (739.03382 nm). Using the Modulation Transfer Spectroscopy (MTS) method for the highly sensitive detection of weak absorption signals, the Doppler-free absorption peaks of I2 corresponding to the hot band transition R(78) (1–11) are resolved. The ECDL’s frequency is stabilized with respect to one of the lines lying within the reference absorption band. For this, the iodine vapor cell is heated to 450 °C and the corresponding circularly polarized pump and probe beam powers are maintained at 10 mW and 1 mW, respectively, to avoid power broadening. The short (100 ms) and long-term (50 h) linewidths of the frequency stabilized laser are measured to be 0.75(3) MHz and 0.5(2) MHz, respectively, whereas the natural linewidth of the specific I2-transitions lie within a range of tens of MHz.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48410936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Electron Impact Ionization Cross-Section Maxima of Atoms 原子的电子冲击电离截面最大值
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-08 DOI: 10.3390/atoms11050081
A. C. F. dos Santos, K. Tőkési
Using measured cross-sections and polarizability data, an empirical scaling law is extracted for the electron collision single-ionization cross-section maxima of neutral atoms. We found that the cross sections scale linearly with the target’s static polarizability. We confirm this observation using our present three-body classical trajectory Monte Carlo simulations.
利用实测截面和极化率数据,提取了中性原子电子碰撞单电离截面最大值的经验标度规律。我们发现横截面与目标的静态极化率呈线性关系。我们用我们目前的三体经典轨迹蒙特卡洛模拟证实了这一观察结果。
{"title":"Electron Impact Ionization Cross-Section Maxima of Atoms","authors":"A. C. F. dos Santos, K. Tőkési","doi":"10.3390/atoms11050081","DOIUrl":"https://doi.org/10.3390/atoms11050081","url":null,"abstract":"Using measured cross-sections and polarizability data, an empirical scaling law is extracted for the electron collision single-ionization cross-section maxima of neutral atoms. We found that the cross sections scale linearly with the target’s static polarizability. We confirm this observation using our present three-body classical trajectory Monte Carlo simulations.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":"1 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69556022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Collision Strengths of Astrophysical Interest for Multiply Charged Ions 天体物理学对多重带电离子碰撞强度的兴趣
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-06 DOI: 10.3390/atoms11050080
S. Fritzsche, L. Jiao, Yuancheng Wang, J. Sienkiewicz
The electron impact excitation and ionization processes are crucial for modeling the spectra of different astrophysical objects, from atmospheres of late-type stars to remnants of supernovae and up to the light emission from neutron star mergers, to name just a few. Despite their significance, however, little is known quantitatively about these processes for low- and medium-impact energies of, say, Ekin≲5000 eV of the free incident electron. To further explore the role of impact excitation, we here expanded Jac, the Jena Atomic Calculator, to the computation of distorted wave collision strengths for fine-structure-resolved, as well as configuration-averaged transitions. While we excluded the formation of dielectronic resonances, these tools can be readily applied for ions with a complex shell structure and by including the major relativistic contributions to these strengths. Detailed computations of the collision strengths are shown and explained for the impact excitation of lithium- and chlorine-like ions. When compared with other, well-correlated methods, good agreement was found, and hence, these tools will support studies of effective collision strengths for a wide range of electron impact energies, levels, and ionic charge states.
电子撞击激发和电离过程对于不同天体物理对象的光谱建模至关重要,从晚期恒星的大气到超新星的残骸,再到中子星合并的光发射,仅举几例。然而,尽管它们具有重要意义,但对于低和中等冲击能量,例如,自由入射电子的Ekin > 5000 eV,这些过程的定量知之甚少。为了进一步探索碰撞激发的作用,我们在这里扩展了Jac,耶拿原子计算器,用于计算精细结构分辨的畸变波碰撞强度,以及构型平均跃迁。虽然我们排除了介电共振的形成,但这些工具可以很容易地应用于具有复杂壳结构的离子,并通过包括对这些强度的主要相对论贡献。给出了碰撞强度的详细计算,并解释了锂离子和氯离子的碰撞激发。当与其他相关方法比较时,发现了良好的一致性,因此,这些工具将支持研究大范围的电子冲击能量、能级和离子荷态的有效碰撞强度。
{"title":"Collision Strengths of Astrophysical Interest for Multiply Charged Ions","authors":"S. Fritzsche, L. Jiao, Yuancheng Wang, J. Sienkiewicz","doi":"10.3390/atoms11050080","DOIUrl":"https://doi.org/10.3390/atoms11050080","url":null,"abstract":"The electron impact excitation and ionization processes are crucial for modeling the spectra of different astrophysical objects, from atmospheres of late-type stars to remnants of supernovae and up to the light emission from neutron star mergers, to name just a few. Despite their significance, however, little is known quantitatively about these processes for low- and medium-impact energies of, say, Ekin≲5000 eV of the free incident electron. To further explore the role of impact excitation, we here expanded Jac, the Jena Atomic Calculator, to the computation of distorted wave collision strengths for fine-structure-resolved, as well as configuration-averaged transitions. While we excluded the formation of dielectronic resonances, these tools can be readily applied for ions with a complex shell structure and by including the major relativistic contributions to these strengths. Detailed computations of the collision strengths are shown and explained for the impact excitation of lithium- and chlorine-like ions. When compared with other, well-correlated methods, good agreement was found, and hence, these tools will support studies of effective collision strengths for a wide range of electron impact energies, levels, and ionic charge states.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45104445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Projectile Coherence Effects in Twisted Electron Ionization of Helium 氦扭曲电子电离中的抛射相干效应
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-03 DOI: 10.3390/atoms11050079
A. Harris
Over the last decade, it has become clear that for heavy ion projectiles, the projectile’s transverse coherence length must be considered in theoretical models. While traditional scattering theory often assumes that the projectile has an infinite coherence length, many studies have demonstrated that the effect of projectile coherence cannot be ignored, even when the projectile-target interaction is within the perturbative regime. This has led to a surge in studies that examine the effects of the projectile’s coherence length. Heavy-ion collisions are particularly well-suited to this because the projectile’s momentum can be large, leading to a small deBroglie wavelength. In contrast, electron projectiles that have larger deBroglie wavelengths and coherence effects can usually be safely ignored. However, the recent demonstration of sculpted electron wave packets opens the door to studying projectile coherence effects in electron-impact collisions. We report here theoretical triple differential cross-sections (TDCSs) for the electron-impact ionization of helium using Bessel and Laguerre-Gauss projectiles. We show that the projectile’s transverse coherence length affects the shape and magnitude of the TDCSs and that the atomic target’s position within the projectile beam plays a significant role in the probability of ionization. We also demonstrate that projectiles with large coherence lengths result in cross-sections that more closely resemble their fully coherent counterparts.
在过去的十年里,很明显,对于重离子射弹,理论模型中必须考虑射弹的横向相干长度。虽然传统的散射理论通常假设射弹具有无限相干长度,但许多研究表明,即使射弹与目标的相互作用处于微扰状态,也不能忽视射弹相干的影响。这导致了研究抛射物相干长度影响的研究激增。重离子碰撞特别适合这种情况,因为抛射物的动量可能很大,导致德布罗意波长很小。相反,具有较大德布罗意波长和相干效应的电子射弹通常可以被安全地忽略。然而,最近雕刻的电子波包的演示为研究电子碰撞中的射弹相干效应打开了大门。本文报道了利用贝塞尔和拉盖尔-高斯射弹对氦进行电子碰撞电离的理论三微分截面(TDCS)。我们表明,射弹的横向相干长度影响TDCS的形状和大小,原子目标在射弹束中的位置对电离概率起着重要作用。我们还证明,具有大相干长度的射弹的横截面与完全相干的射弹更相似。
{"title":"Projectile Coherence Effects in Twisted Electron Ionization of Helium","authors":"A. Harris","doi":"10.3390/atoms11050079","DOIUrl":"https://doi.org/10.3390/atoms11050079","url":null,"abstract":"Over the last decade, it has become clear that for heavy ion projectiles, the projectile’s transverse coherence length must be considered in theoretical models. While traditional scattering theory often assumes that the projectile has an infinite coherence length, many studies have demonstrated that the effect of projectile coherence cannot be ignored, even when the projectile-target interaction is within the perturbative regime. This has led to a surge in studies that examine the effects of the projectile’s coherence length. Heavy-ion collisions are particularly well-suited to this because the projectile’s momentum can be large, leading to a small deBroglie wavelength. In contrast, electron projectiles that have larger deBroglie wavelengths and coherence effects can usually be safely ignored. However, the recent demonstration of sculpted electron wave packets opens the door to studying projectile coherence effects in electron-impact collisions. We report here theoretical triple differential cross-sections (TDCSs) for the electron-impact ionization of helium using Bessel and Laguerre-Gauss projectiles. We show that the projectile’s transverse coherence length affects the shape and magnitude of the TDCSs and that the atomic target’s position within the projectile beam plays a significant role in the probability of ionization. We also demonstrate that projectiles with large coherence lengths result in cross-sections that more closely resemble their fully coherent counterparts.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45786518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Enhanced Acetone Sensing Based on Group-11 Metal (Cu, Ag, and Au) Nanoparticles Embedded in Graphitic Carbon Nitride (gCN) 基于嵌入石墨氮化碳(gCN)的11族金属(Cu、Ag和Au)纳米粒子的增强丙酮传感
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-05-01 DOI: 10.3390/atoms11050078
Nihal, R. Sharma, Navjot Kaur, Mamta Sharma, B. Choudhary, J. Goswamy
In this work, a group-11 metal nanoparticle-embedded, graphitic carbon nitride-based, resistive-type sensor was developed for room temperature acetone sensing. We synthesized pure and group-11 transition metal (Cu, Ag and Au) nanoparticles embedded in graphitic carbon nitride (gCN) by thermal polycondensation and chemical reduction methods. The synthesized material was characterized using UV/visspectroscopy, FTIRspectroscopy, XRD, HRTEM, FESEM, and EDS techniques. Sensing properties such as response, response/recovery time, selectivity, and stability were calculated. This study confirms that Ag/gCN is the best material for room temperature sensing of acetone compared to Cu/gCN, Au/gCN, and pure gCN. The response of Ag/gCN for 20 ppm acetone at room temperature is 28%. The response/recovery time is 42.05/37.09 s. Moreover, the response of Ag/gCN is stable for 10 days.
在这项工作中,开发了一种用于室温丙酮传感的11族金属纳米颗粒嵌入、石墨氮化碳基电阻型传感器。我们通过热缩聚和化学还原方法合成了嵌入石墨氮化碳(gCN)中的纯11族过渡金属(Cu、Ag和Au)纳米颗粒。利用紫外/可见光谱、FTIR光谱、XRD、HRTEM、FESEM和EDS技术对合成的材料进行了表征。计算了响应、响应/恢复时间、选择性和稳定性等传感特性。本研究证实,与Cu/gCN、Au/gCN和纯gCN相比,Ag/gCN是丙酮室温传感的最佳材料。Ag/gCN在室温下对20ppm丙酮的响应为28%。响应/恢复时间为42.05/37.09s。此外,Ag/gCN的响应在10天内是稳定的。
{"title":"Enhanced Acetone Sensing Based on Group-11 Metal (Cu, Ag, and Au) Nanoparticles Embedded in Graphitic Carbon Nitride (gCN)","authors":"Nihal, R. Sharma, Navjot Kaur, Mamta Sharma, B. Choudhary, J. Goswamy","doi":"10.3390/atoms11050078","DOIUrl":"https://doi.org/10.3390/atoms11050078","url":null,"abstract":"In this work, a group-11 metal nanoparticle-embedded, graphitic carbon nitride-based, resistive-type sensor was developed for room temperature acetone sensing. We synthesized pure and group-11 transition metal (Cu, Ag and Au) nanoparticles embedded in graphitic carbon nitride (gCN) by thermal polycondensation and chemical reduction methods. The synthesized material was characterized using UV/visspectroscopy, FTIRspectroscopy, XRD, HRTEM, FESEM, and EDS techniques. Sensing properties such as response, response/recovery time, selectivity, and stability were calculated. This study confirms that Ag/gCN is the best material for room temperature sensing of acetone compared to Cu/gCN, Au/gCN, and pure gCN. The response of Ag/gCN for 20 ppm acetone at room temperature is 28%. The response/recovery time is 42.05/37.09 s. Moreover, the response of Ag/gCN is stable for 10 days.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47417866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fragmentation Dynamics of CO2q+ (q = 2, 3) in Collisions with 1 MeV Proton CO2q+(q=2,3)与1MeV质子碰撞的碎裂动力学
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-04-23 DOI: 10.3390/atoms11050075
Avijit Duley, A. Kelkar
The fragmentation dynamics of the CO2q+ (q = 2, 3) molecular ions formed under the impact of 1 MeV protons is studied using a recoil ion momentum spectrometer equipped with a multi-hit time- and position-sensitive detector. Both two-body and three-body fragmentation channels arising from the doubly and triply ionized molecular ions of CO2 are identified and analyzed. Kinetic energy release (KER) distributions have been obtained for various channels. With the help of Dalitz plots and Newton diagrams concerted and sequential processes have been assigned to observed fragmentation channels. In addition, angular correlations are used to determine the molecular geometry of the precursor molecular ion. It is found that the symmetric breakup into C+ + O+ + O+ involves asymmetric stretching of the molecular bonds in CO23+ prior to dissociation via concerted decay implying the fact that collisions with 1 MeV proton induces an asynchronous decay in CO2.
利用配备多点时间和位置灵敏探测器的反冲离子动量谱仪,研究了在1MeV质子撞击下形成的CO2q+(q=2,3)分子离子的碎裂动力学。对CO2分子离子双电离和三电离产生的两体和三体碎裂通道进行了鉴定和分析。已经获得了各种通道的动能释放(KER)分布。在Dalitz图和牛顿图的帮助下,已将协调和顺序过程分配给观测到的碎裂通道。此外,角关联用于确定前体分子离子的分子几何结构。研究发现,对称分解为C++O++O+涉及在通过协同衰变离解之前CO23+中分子键的不对称拉伸,这意味着与1MeV质子的碰撞导致CO2的异步衰变。
{"title":"Fragmentation Dynamics of CO2q+ (q = 2, 3) in Collisions with 1 MeV Proton","authors":"Avijit Duley, A. Kelkar","doi":"10.3390/atoms11050075","DOIUrl":"https://doi.org/10.3390/atoms11050075","url":null,"abstract":"The fragmentation dynamics of the CO2q+ (q = 2, 3) molecular ions formed under the impact of 1 MeV protons is studied using a recoil ion momentum spectrometer equipped with a multi-hit time- and position-sensitive detector. Both two-body and three-body fragmentation channels arising from the doubly and triply ionized molecular ions of CO2 are identified and analyzed. Kinetic energy release (KER) distributions have been obtained for various channels. With the help of Dalitz plots and Newton diagrams concerted and sequential processes have been assigned to observed fragmentation channels. In addition, angular correlations are used to determine the molecular geometry of the precursor molecular ion. It is found that the symmetric breakup into C+ + O+ + O+ involves asymmetric stretching of the molecular bonds in CO23+ prior to dissociation via concerted decay implying the fact that collisions with 1 MeV proton induces an asynchronous decay in CO2.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48674463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical Investigation of Electron–Ion Recombination Process of Mg-like Gold 类镁金电子-离子复合过程的理论研究
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-04-23 DOI: 10.3390/atoms11050076
L. Xie, Wenliang He, Shengbo Niu, J. Rui, Yulong Ma, C. Dong
The L-shell dielectronic and trielectronic recombinations of highly charged Mg-like gold ions (Au67+) in the ground state 2s22p63s2 1S0 have been studied systematically. The recombination cross-sections and rate coefficients are carefully calculated for ∆n = 1 (2s/2p → 3l) transitions using a flexible atomic code based on the relativistic configuration interaction method and considering the Breit and QED corrections. Detailed resonance energies and resonance strengths are presented for the stronger resonances of the LMn (n = 3–12) series. It is found that the contributions of the trielectronic recombination to the total cross-section is about 13.75%, which cannot be neglected. For convenience of application, the plasma rate coefficients are also calculated and fitted to a semiempirical formula, and in the calculations, the contributions from the higher excited resonance groups n ≥ 13 are evaluated by an extrapolation method, which is about 2.93% of the total rate coefficient.
本文系统地研究了高荷电类mg金离子(Au67+)在基态2s22p63s2 1S0下的l壳层双电子和三电子复合。利用基于相对论组态相互作用方法的柔性原子码,考虑Breit和QED修正,仔细计算了∆n = 1 (2s/2p→3l)跃迁的复合截面和速率系数。给出了LMn (n = 3-12)系列较强共振的详细共振能量和共振强度。结果表明,三电子复合对总截面的贡献约为13.75%,不容忽视。为方便应用,还计算了等离子体速率系数,并拟合为半经验公式,计算中采用外推法计算了n≥13的高激发共振群的贡献,约占总速率系数的2.93%。
{"title":"Theoretical Investigation of Electron–Ion Recombination Process of Mg-like Gold","authors":"L. Xie, Wenliang He, Shengbo Niu, J. Rui, Yulong Ma, C. Dong","doi":"10.3390/atoms11050076","DOIUrl":"https://doi.org/10.3390/atoms11050076","url":null,"abstract":"The L-shell dielectronic and trielectronic recombinations of highly charged Mg-like gold ions (Au67+) in the ground state 2s22p63s2 1S0 have been studied systematically. The recombination cross-sections and rate coefficients are carefully calculated for ∆n = 1 (2s/2p → 3l) transitions using a flexible atomic code based on the relativistic configuration interaction method and considering the Breit and QED corrections. Detailed resonance energies and resonance strengths are presented for the stronger resonances of the LMn (n = 3–12) series. It is found that the contributions of the trielectronic recombination to the total cross-section is about 13.75%, which cannot be neglected. For convenience of application, the plasma rate coefficients are also calculated and fitted to a semiempirical formula, and in the calculations, the contributions from the higher excited resonance groups n ≥ 13 are evaluated by an extrapolation method, which is about 2.93% of the total rate coefficient.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46721824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Signatures of Quantum Chaos of Rydberg-Dressed Bosons in a Triple-Well Potential 三阱势中rydberg修饰玻色子的量子混沌特征
IF 1.8 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Pub Date : 2023-04-19 DOI: 10.3390/atoms11060089
T. Yan, M. Collins, R. Nath, Weibin Li
We studied signatures of quantum chaos in dynamics of Rydberg-dressed bosonic atoms held in a one-dimensional triple-well potential. Long-range nearest-neighbor and next-nearest-neighbor interactions, induced by laser dressing atoms to strongly interacting Rydberg states, drastically affect mean-field and quantum many-body dynamics. By analyzing the mean-field dynamics, classical chaos regions with positive and large Lyapunov exponents were identified as a function of the potential well tilting and dressed interactions. In the quantum regime, it was found that level statistics of the eigen-energies gain a Wigner–Dyson distribution when the Lyapunov exponents are large, giving rise to signatures of strong quantum chaos. We found that both the time-averaged entanglement entropy and survival probability of the initial state have distinctively large values in the quantum chaos regime. We further showed that population variances could be used as an indicator of the emergence of quantum chaos. This might provide a way to directly probe quantum chaotic dynamics through analyzing population dynamics in individual potential wells.
我们研究了一维三阱势中里德伯修饰玻色子原子动力学中量子混沌的特征。激光将原子修饰成强相互作用的里德伯态,引发了长距离最近邻和次最近邻相互作用,极大地影响了平均场和量子多体动力学。通过分析平均场动力学,将具有正和大李雅普诺夫指数的经典混沌区域确定为势阱倾斜和修整相互作用的函数。在量子机制中,发现当李雅普诺夫指数较大时,本征能量的能级统计得到Wigner–Dyson分布,从而产生强量子混沌的特征。我们发现,在量子混沌系统中,初始态的时间平均纠缠熵和生存概率都有显著的大值。我们进一步证明了种群方差可以作为量子混沌出现的指标。这可能提供一种通过分析单个势阱中的布居动力学来直接探测量子混沌动力学的方法。
{"title":"Signatures of Quantum Chaos of Rydberg-Dressed Bosons in a Triple-Well Potential","authors":"T. Yan, M. Collins, R. Nath, Weibin Li","doi":"10.3390/atoms11060089","DOIUrl":"https://doi.org/10.3390/atoms11060089","url":null,"abstract":"We studied signatures of quantum chaos in dynamics of Rydberg-dressed bosonic atoms held in a one-dimensional triple-well potential. Long-range nearest-neighbor and next-nearest-neighbor interactions, induced by laser dressing atoms to strongly interacting Rydberg states, drastically affect mean-field and quantum many-body dynamics. By analyzing the mean-field dynamics, classical chaos regions with positive and large Lyapunov exponents were identified as a function of the potential well tilting and dressed interactions. In the quantum regime, it was found that level statistics of the eigen-energies gain a Wigner–Dyson distribution when the Lyapunov exponents are large, giving rise to signatures of strong quantum chaos. We found that both the time-averaged entanglement entropy and survival probability of the initial state have distinctively large values in the quantum chaos regime. We further showed that population variances could be used as an indicator of the emergence of quantum chaos. This might provide a way to directly probe quantum chaotic dynamics through analyzing population dynamics in individual potential wells.","PeriodicalId":8629,"journal":{"name":"Atoms","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49102922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
期刊
Atoms
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1