Pub Date : 2023-11-08DOI: 10.1088/1361-6455/ad047d
Yuri B Ovchinnikov, Alessio Spampinato, Folly Eli Ayi-Yovo
Abstract Optical dipole micro-traps for atoms based on constructive superposition of two-colour evanescent light waves, formed by corresponding optical modes of two crossed suspended photonic rib waveguides, are modelled. The main parameters of the traps for rubidium atoms, such as potential depth, tunnelling rates of atoms from the trap and coherence time of the trapped atoms are estimated.
{"title":"Optical dipole micro-trap for atoms based on crossed planar photonic waveguides","authors":"Yuri B Ovchinnikov, Alessio Spampinato, Folly Eli Ayi-Yovo","doi":"10.1088/1361-6455/ad047d","DOIUrl":"https://doi.org/10.1088/1361-6455/ad047d","url":null,"abstract":"Abstract Optical dipole micro-traps for atoms based on constructive superposition of two-colour evanescent light waves, formed by corresponding optical modes of two crossed suspended photonic rib waveguides, are modelled. The main parameters of the traps for rubidium atoms, such as potential depth, tunnelling rates of atoms from the trap and coherence time of the trapped atoms are estimated.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":" 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135293105","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}
Pub Date : 2023-11-06DOI: 10.1088/1361-6455/ad05db
Elias Jabbour Al Maalouf, Masoomeh Mahmoodi-Darian, Stephan Denifl
Abstract Using a high-resolution electron monochromator, we studied the formation of (H 2 O) n ⩽19 − cluster ions upon collisions of free low-energy electrons with water clusters embedded in helium droplets. The anion efficiency curves as a function of the initial electron energy were measured for the cluster sizes n = 2–8, 10, 13, 16, and 19. The present experimental results show that the shape of the resonance yields is dependent on the size of the water cluster anion. The results are discussed in terms of the different electron states available for the excess electron from a linear cluster structure to three-dimensional cluster structures as the number of water molecules within the cluster increases.
{"title":"Evolution of the Resonances of Small Water Cluster Anions (H2O)n≤19– in He Droplets upon Attachment of Electrons","authors":"Elias Jabbour Al Maalouf, Masoomeh Mahmoodi-Darian, Stephan Denifl","doi":"10.1088/1361-6455/ad05db","DOIUrl":"https://doi.org/10.1088/1361-6455/ad05db","url":null,"abstract":"Abstract Using a high-resolution electron monochromator, we studied the formation of (H 2 O) n ⩽19 − cluster ions upon collisions of free low-energy electrons with water clusters embedded in helium droplets. The anion efficiency curves as a function of the initial electron energy were measured for the cluster sizes n = 2–8, 10, 13, 16, and 19. The present experimental results show that the shape of the resonance yields is dependent on the size of the water cluster anion. The results are discussed in terms of the different electron states available for the excess electron from a linear cluster structure to three-dimensional cluster structures as the number of water molecules within the cluster increases.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135584868","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}
Pub Date : 2023-11-03DOI: 10.1088/1361-6455/ad065b
Wentao Li, Li Wen, Xianghong Niu, Wei Xing
Abstract The non-adiabatic dynamical calculations of the K(4s 2 S) + H 2 ( v 0 = 1, 2, j 0 = 0) reaction are carried out using the time-dependent wave packet method. The non-adiabatic dynamics results, such as reaction probabilities and integral cross sections, are calculated and compared with previous adiabatic values. The adiabatic values are several tens of times larger than those of the non-adiabatic results. The non-adiabatic effect becomes stronger with the increase in the number of excited vibrational states. In addition, the excitation of the vibrational states of H 2 can increase the reaction probability of the reaction channel. However, the KH product is still barely formed through the K(4s 2 S) + H 2 reaction, even if the H 2 molecule is excited to a high vibrational excited state, which also leads to the opposite conclusion from the adiabatic results. The forward-biased differential cross sections indicate that a direct stripping mechanism plays a dominant role in the reaction.
{"title":"Significant non-adiabatic effect of the K(4s2S) + H2 reaction","authors":"Wentao Li, Li Wen, Xianghong Niu, Wei Xing","doi":"10.1088/1361-6455/ad065b","DOIUrl":"https://doi.org/10.1088/1361-6455/ad065b","url":null,"abstract":"Abstract The non-adiabatic dynamical calculations of the K(4s 2 S) + H 2 ( v 0 = 1, 2, j 0 = 0) reaction are carried out using the time-dependent wave packet method. The non-adiabatic dynamics results, such as reaction probabilities and integral cross sections, are calculated and compared with previous adiabatic values. The adiabatic values are several tens of times larger than those of the non-adiabatic results. The non-adiabatic effect becomes stronger with the increase in the number of excited vibrational states. In addition, the excitation of the vibrational states of H 2 can increase the reaction probability of the reaction channel. However, the KH product is still barely formed through the K(4s 2 S) + H 2 reaction, even if the H 2 molecule is excited to a high vibrational excited state, which also leads to the opposite conclusion from the adiabatic results. The forward-biased differential cross sections indicate that a direct stripping mechanism plays a dominant role in the reaction.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"166 S350","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775757","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}
Pub Date : 2023-11-03DOI: 10.1088/1361-6455/ad065c
Tao Shao, Minyang Zhang, Chenlu Li, Yuanxiang Wang, Youyou Hu, Mingming Zhang, Jun Liu
Abstract We have theoretically investigated the phase sensitivity of the hybrid interferometer with two coherent beams using the method of balance homodyne detection. The measurement device is a nonlinear–linear hybrid interferometer consisting of an optical parametric amplifier and a beam splitter. We prove that the phase sensitivity can beat the shot noise limit in the optimal conditions. Furthermore, we derive the quantum Cramér–Rao bound of the hybrid interferometer. The effects of transmission loss and detection loss on the measurement accuracy are discussed. The detection accuracy of this scheme is compared with that of the conventional SU (1,1) interferometer. Our results show that this scheme outperforms the conventional SU (1,1) interferometer scheme at high parametric strength. This scheme can be implemented with existing experimental techniques and will have important applications in quantum precision measurements.
{"title":"Supersensitive phase estimation for hybrid interferometer using balanced homodyne detection","authors":"Tao Shao, Minyang Zhang, Chenlu Li, Yuanxiang Wang, Youyou Hu, Mingming Zhang, Jun Liu","doi":"10.1088/1361-6455/ad065c","DOIUrl":"https://doi.org/10.1088/1361-6455/ad065c","url":null,"abstract":"Abstract We have theoretically investigated the phase sensitivity of the hybrid interferometer with two coherent beams using the method of balance homodyne detection. The measurement device is a nonlinear–linear hybrid interferometer consisting of an optical parametric amplifier and a beam splitter. We prove that the phase sensitivity can beat the shot noise limit in the optimal conditions. Furthermore, we derive the quantum Cramér–Rao bound of the hybrid interferometer. The effects of transmission loss and detection loss on the measurement accuracy are discussed. The detection accuracy of this scheme is compared with that of the conventional SU (1,1) interferometer. Our results show that this scheme outperforms the conventional SU (1,1) interferometer scheme at high parametric strength. This scheme can be implemented with existing experimental techniques and will have important applications in quantum precision measurements.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775752","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}
Pub Date : 2023-11-02DOI: 10.1088/1361-6455/ad08da
Xiao-Lin Li, Ling-Zheng Meng, Lichen Zhao
Abstract We investigate the dynamics of beating solitons in a two-component Bose-Einstein condensate with tunable Rabi coupling strength. Our results demonstrate that the balance between transition and beating effects permits the emergence of a novel family of asymmetric solitons in the symmetric physical settings. We derive the exact analytical solutions for them, which primarily consist of one bright soliton and one dark soliton element. The analytical solutions provide us with precise balance conditions required for the formation of asymmetric solitons. We also show that the degree of asymmetry can be effectively manipulated by adjusting the background density flow of dark soliton element, initial relative phase between two soliton elements, and their width. Furthermore, we discuss the oscillation behavior of asymmetric solitons in a harmonic potential, and the interaction between them.
{"title":"Asymmetric solitons induced by transition and beating effects","authors":"Xiao-Lin Li, Ling-Zheng Meng, Lichen Zhao","doi":"10.1088/1361-6455/ad08da","DOIUrl":"https://doi.org/10.1088/1361-6455/ad08da","url":null,"abstract":"Abstract We investigate the dynamics of beating solitons in a two-component Bose-Einstein condensate with tunable Rabi coupling strength. Our results demonstrate that the balance between transition and beating effects permits the emergence of a novel family of asymmetric solitons in the symmetric physical settings. We derive the exact analytical solutions for them, which primarily consist of one bright soliton and one dark soliton element. The analytical solutions provide us with precise balance conditions required for the formation of asymmetric solitons. We also show that the degree of asymmetry can be effectively manipulated by adjusting the background density flow of dark soliton element, initial relative phase between two soliton elements, and their width. Furthermore, we discuss the oscillation behavior of asymmetric solitons in a harmonic potential, and the interaction between them.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"13 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135875572","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}
Pub Date : 2023-11-01DOI: 10.1088/1361-6455/ad013a
Mehri Sadat Ebrahimi, Malek Bagheri Harouni
Abstract In this work, we consider a parity-time ( PT ) symmetric cavity magnonic system involving the magnon–photon interaction with small magnon Kerr nonlinearity. Moreover, we investigate the effect of PT -symmetry phase on both the magnon and photon blockade. We show that the PT -symmetry phase, which is achievable by properly selecting the system parameters, can relax the large Kerr nonlinearity requirement for magnon blockade. Consequently, simultaneous perfect magnon and photon blockade can be easily obtained even in the presence of a small value of magnon Kerr nonlinearity. The outstanding feature of the selected scheme is the occurrence of simultaneous perfect magnon and photon blockade with only a small value of magnon Kerr nonlinearity. While photon blockade can be easily distinguished experimentally, the experimental realization of magnon statistics and consequently magnon blockade is still a challenge. The prominent feature of the PT -symmetric cavity magnonic system can relax this challenge by following the magnon blockade criteria via the photon statistics.
{"title":"Parity-time symmetry-enhanced simultaneous magnon and photon blockade in cavity magnonic system","authors":"Mehri Sadat Ebrahimi, Malek Bagheri Harouni","doi":"10.1088/1361-6455/ad013a","DOIUrl":"https://doi.org/10.1088/1361-6455/ad013a","url":null,"abstract":"Abstract In this work, we consider a parity-time ( <?CDATA $mathcal{P}mathcal{T}$?> <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">P</mml:mi> </mml:mrow> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">T</mml:mi> </mml:mrow> </mml:math> ) symmetric cavity magnonic system involving the magnon–photon interaction with small magnon Kerr nonlinearity. Moreover, we investigate the effect of <?CDATA $mathcal{P}mathcal{T}$?> <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">P</mml:mi> </mml:mrow> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">T</mml:mi> </mml:mrow> </mml:math> -symmetry phase on both the magnon and photon blockade. We show that the <?CDATA $mathcal{P}mathcal{T}$?> <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">P</mml:mi> </mml:mrow> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">T</mml:mi> </mml:mrow> </mml:math> -symmetry phase, which is achievable by properly selecting the system parameters, can relax the large Kerr nonlinearity requirement for magnon blockade. Consequently, simultaneous perfect magnon and photon blockade can be easily obtained even in the presence of a small value of magnon Kerr nonlinearity. The outstanding feature of the selected scheme is the occurrence of simultaneous perfect magnon and photon blockade with only a small value of magnon Kerr nonlinearity. While photon blockade can be easily distinguished experimentally, the experimental realization of magnon statistics and consequently magnon blockade is still a challenge. The prominent feature of the <?CDATA $mathcal{P}mathcal{T}$?> <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\"> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">P</mml:mi> </mml:mrow> <mml:mrow> <mml:mi class=\"MJX-tex-calligraphic\">T</mml:mi> </mml:mrow> </mml:math> -symmetric cavity magnonic system can relax this challenge by following the magnon blockade criteria via the photon statistics.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"65 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135062777","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}
Abstract Relaxation behavior of vibrationally excited N 2 (X 1 Σ g + v ″ = 6) induced by collisions with H 2 has been investigated using coherent anti-Stokes Raman spectroscopy (CARS). The total pressure of the N 2 –H 2 mixture was 500 Torr, and the molar ratios of H 2 were 0.3, 0.4, 0.5, 0.6 and 0.8, respectively. The v ″ = 6 vibrational state of the electronic ground-state manifold X 1 Σ g + of N 2 was selectively excited by overtone pumping, and the population evolution was monitored using CARS spectroscopy. The collisional deactivation rate coefficients of the excited state N 2 ( v ″ = 6) with H 2 and N 2 are approximately 2.59 × 10 −14 cm 3 s −1 and 1.04 × 10 −14 cm 3 s −1 at 300 K, and 2.57 × 10 −14 cm 3 s −1 and 0.54 × 10 −14 cm 3 s −1 at 320 K, respectively. The relaxation rate coefficient of the N 2 –H 2 collision was approximately 2.5 and 5 times that of the self-relaxation rate coefficient. The experimental results show that the population densities of the (1,2), (2,2), (3,5), and (3,6) levels of H 2 have a maximum at 320 K, while the population densities of (2,3) and (2,4) show little change with increasing temperature. Simultaneously, the time-resolved CARS profiles of the vibrational levels v = 6,5,4 by preparing v = 6 of N 2 also indicated that a near-resonant multi-quantum relaxation process occurred between N 2 –H 2 . The collision-induced population distribution of H 2 was observed at molar ratios of 0.3, 0.4, 0.5, 0.6 and 0.8, respectively. The ro-vibrational population distribution of H 2 after collision with N 2 is given by the CARS signal intensity ratio, and the population of hydrogen molecules at v = 2, 3 vibrational states also provides strong experimental evidence for energy near-resonance collisions between N 2 –H 2 .
用相干反斯托克斯拉曼光谱(CARS)研究了与h2碰撞引起的振动激发n2 (x1 Σ g + v″= 6)的弛豫行为。n2 - h2混合物的总压为500 Torr, h2的摩尔比分别为0.3、0.4、0.5、0.6和0.8。利用泛音泵浦选择性激发n2的电子基态流形x1 Σ g +的v″= 6振动态，并利用CARS光谱监测其种群演化。激发态n2 (v″= 6)与h2和n2的碰撞失活率系数在300 K时约为2.59 × 10−14 cm 3s−1和1.04 × 10−14 cm 3s−1，在320 K时约为2.57 × 10−14 cm 3s−1和0.54 × 10−14 cm 3s−1。n2 - h2碰撞的弛豫速率系数约为自弛豫速率系数的2.5倍和5倍。实验结果表明，h2(1,2)、(2,2)、(3,5)和(3,6)能级的密度在320 K时达到最大值，而(2,3)和(2,4)能级的密度随温度的升高变化不大。同时，制备v = 6的n2的振动能级v = 6,5,4的时间分辨CARS谱也表明n2 - h2之间发生了近共振的多量子弛豫过程。在摩尔比分别为0.3、0.4、0.5、0.6和0.8时，观察到碰撞诱导的h2居群分布。CARS信号强度比给出了h2与n2碰撞后的反振动居族分布，v = 2,3振动态的氢分子居族也为n2 - h2能量近共振碰撞提供了有力的实验证据。
{"title":"Relaxation behavior of vibrationally excited N2(X1Σg+ v′′ = 6) collisions with H2","authors":"ayxam mamatimin, Jing Liu, Nurali Habibulla, Abai Alghazi","doi":"10.1088/1361-6455/ad03ff","DOIUrl":"https://doi.org/10.1088/1361-6455/ad03ff","url":null,"abstract":"Abstract Relaxation behavior of vibrationally excited N 2 (X 1 Σ g + v ″ = 6) induced by collisions with H 2 has been investigated using coherent anti-Stokes Raman spectroscopy (CARS). The total pressure of the N 2 –H 2 mixture was 500 Torr, and the molar ratios of H 2 were 0.3, 0.4, 0.5, 0.6 and 0.8, respectively. The v ″ = 6 vibrational state of the electronic ground-state manifold X 1 Σ g + of N 2 was selectively excited by overtone pumping, and the population evolution was monitored using CARS spectroscopy. The collisional deactivation rate coefficients of the excited state N 2 ( v ″ = 6) with H 2 and N 2 are approximately 2.59 × 10 −14 cm 3 s −1 and 1.04 × 10 −14 cm 3 s −1 at 300 K, and 2.57 × 10 −14 cm 3 s −1 and 0.54 × 10 −14 cm 3 s −1 at 320 K, respectively. The relaxation rate coefficient of the N 2 –H 2 collision was approximately 2.5 and 5 times that of the self-relaxation rate coefficient. The experimental results show that the population densities of the (1,2), (2,2), (3,5), and (3,6) levels of H 2 have a maximum at 320 K, while the population densities of (2,3) and (2,4) show little change with increasing temperature. Simultaneously, the time-resolved CARS profiles of the vibrational levels v = 6,5,4 by preparing v = 6 of N 2 also indicated that a near-resonant multi-quantum relaxation process occurred between N 2 –H 2 . The collision-induced population distribution of H 2 was observed at molar ratios of 0.3, 0.4, 0.5, 0.6 and 0.8, respectively. The ro-vibrational population distribution of H 2 after collision with N 2 is given by the CARS signal intensity ratio, and the population of hydrogen molecules at v = 2, 3 vibrational states also provides strong experimental evidence for energy near-resonance collisions between N 2 –H 2 .","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"2 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136018991","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}
Pub Date : 2023-10-26DOI: 10.1088/1361-6455/ad073c
Annika Bande, Elke Fasshauer, Axel Molle, Daniel Peláez, Federico M. Pont, Nicolas Sisourat
Abstract Inter-particle Coulombic electron capture (ICEC) is an environment-enabled electron capture process by means of which a free electron can be efficiently attached to a system (e.g. ion, atom, molecule, or quantum dot). The excess electron attachment energy is simultaneously transferred to a neighboring system which concomitantly undergoes ionization (or excitation). ICEC has been theoretically predicted in van-der-Waals and in hydrogen-bonded systems as well as in quantum dot arrays. The theoretical approaches employed in these works range from analytical models to electronic structure and (quantum) dynamical calculations. In this article, we provide a comprehensive review of the main theoretical approaches that have been developed and employed to investigate ICEC and summarize the main conclusions learned from these works. Since knowledge on ICEC is still in its early stage, we conclude this review with our own views and proposals on the future perspectives for the research in ICEC.
{"title":"Interatomic Coulombic Electron Capture: the story so far","authors":"Annika Bande, Elke Fasshauer, Axel Molle, Daniel Peláez, Federico M. Pont, Nicolas Sisourat","doi":"10.1088/1361-6455/ad073c","DOIUrl":"https://doi.org/10.1088/1361-6455/ad073c","url":null,"abstract":"Abstract Inter-particle Coulombic electron capture (ICEC) is an environment-enabled electron capture process by means of which a free electron can be efficiently attached to a system (e.g. ion, atom, molecule, or quantum dot). The excess electron attachment energy is simultaneously transferred to a neighboring system which concomitantly undergoes ionization (or excitation). ICEC has been theoretically predicted in van-der-Waals and in hydrogen-bonded systems as well as in quantum dot arrays. The theoretical approaches employed in these works range from analytical models to electronic structure and (quantum) dynamical calculations. In this article, we provide a comprehensive review of the main theoretical approaches that have been developed and employed to investigate ICEC and summarize the main conclusions learned from these works. Since knowledge on ICEC is still in its early stage, we conclude this review with our own views and proposals on the future perspectives for the research in ICEC.&#xD;","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"23 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134906999","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}
Pub Date : 2023-10-20DOI: 10.1088/1361-6455/ad0204
Ana Lucia Ferreira Barros, A. Bergantini, E. F. da Silveira, S.D. Tozetti, Hermann Rothard, P. Boduch, A. Domaracka
Abstract This article investigates the radiolysis of a mixture of nitric acid with water (HNO 3 :H 2 O) at 16 K in high-vacuum (residual pressure < 10 −6 mbar). A nitric acid-water ice film was exposed to 40 MeV 58 Ni 11+ ion beam in a heavy ion accelerator facility in France. For this astrochemically- and atmospherically-relevant ice mixture of nitric acid and water, we analyze the possible formation and destruction processes of N–O bearing species, thus providing spectroscopic data in the infrared (IR) region for theoretical, laboratory and observational future studies. The irradiation synthetized 18 species which were posteriorly examined by infrared spectroscopy: N 2 O, NH 3 , NO, NO 2 and H x N y O z molecules, such as hidroxylamine (NH 2 OH), nitrous acid (HONO) as well as other species with bonding N–O, N–H and H–O–N converting surface-adsorbed nitrogen oxides into astrochemically active NO x . The interaction of HNO 3 and H 2 O originates H–N–O molecular complexes, which were investigated as particular cases of the hydrogen-bonded species formed by a more electronegative atom (N or O) interacts intra or intermolecularly with a donor atom (N or O) and observed in the interstellar medium with higher quantities or great abundances. The HNO 3 and H 2 O destruction cross sections have been determined to be 8.5 × 10 −13 and 1.2 × 10 −13 cm 2 , respectively, for the mentioned experimental conditions.
摘要:本文研究了高真空(残余压力<10−6mbar)。在法国重离子加速器装置中，将一种硝酸-水冰膜暴露在40 MeV的58 Ni 11+离子束下。对于这种与天体化学和大气相关的硝酸和水的冰混合物，我们分析了含氮物种可能的形成和破坏过程，从而为理论、实验室和观测未来的研究提供了红外(IR)区域的光谱数据。辐照合成了18种n2o、nh3、NO、no2和hxnyoz分子，如氢氧胺(nh2oh)、亚硝酸(HONO)，以及其他与N - O、N - H和H - O - N键合的物质，将表面吸附的氮氧化物转化为具有天体化学活性的nox。hno3和h2o的相互作用产生了H - N - O分子络合物，这是由电负性更强的原子(N或O)与供体原子(N或O)在分子内或分子间相互作用形成的氢键物质的特殊情况，在星际介质中观察到的数量或丰度更高。在上述实验条件下，hno3和h2o的破坏截面分别为8.5 × 10−13和1.2 × 10−13 cm 2。
{"title":"Formation of N–O–H bearing species in HNO<sub>3</sub> and H<sub>2</sub>O icy samples by heavy-ion irradiation: an infrared spectroscopic study","authors":"Ana Lucia Ferreira Barros, A. Bergantini, E. F. da Silveira, S.D. Tozetti, Hermann Rothard, P. Boduch, A. Domaracka","doi":"10.1088/1361-6455/ad0204","DOIUrl":"https://doi.org/10.1088/1361-6455/ad0204","url":null,"abstract":"Abstract This article investigates the radiolysis of a mixture of nitric acid with water (HNO 3 :H 2 O) at 16 K in high-vacuum (residual pressure < 10 −6 mbar). A nitric acid-water ice film was exposed to 40 MeV 58 Ni 11+ ion beam in a heavy ion accelerator facility in France. For this astrochemically- and atmospherically-relevant ice mixture of nitric acid and water, we analyze the possible formation and destruction processes of N–O bearing species, thus providing spectroscopic data in the infrared (IR) region for theoretical, laboratory and observational future studies. The irradiation synthetized 18 species which were posteriorly examined by infrared spectroscopy: N 2 O, NH 3 , NO, NO 2 and H x N y O z molecules, such as hidroxylamine (NH 2 OH), nitrous acid (HONO) as well as other species with bonding N–O, N–H and H–O–N converting surface-adsorbed nitrogen oxides into astrochemically active NO x . The interaction of HNO 3 and H 2 O originates H–N–O molecular complexes, which were investigated as particular cases of the hydrogen-bonded species formed by a more electronegative atom (N or O) interacts intra or intermolecularly with a donor atom (N or O) and observed in the interstellar medium with higher quantities or great abundances. The HNO 3 and H 2 O destruction cross sections have been determined to be 8.5 × 10 −13 and 1.2 × 10 −13 cm 2 , respectively, for the mentioned experimental conditions.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"14 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135513671","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}
Pub Date : 2023-10-19DOI: 10.1088/1361-6455/ad0205
Pamir Nag, Miloš Lj. Ranković, H. Christian Schewe, Jozef Rakovský, Leo Sala, Jaroslav Kočišek, Juraj Fedor
Abstract We present an experimental setup for probing chemical changes in liquids induced by electron collisions. The setup utilizes a custom-designed electron gun that irradiates a liquid microjet with an electron beam of tunable energy. Products of the electron-induced reactions are analyzed ex-situ . The microjet system enables re-circulation of the liquid and thus multiple irradiation of the same sample. As a proof-of-principle experiment, an aqueous solution of TRIS (2-Amino-2-(hydroxymethyl)propane-1,3-diol) was irradiated by 300 eV electron beam. Optical UV–VIS analysis shows that the electron impact on the liquid surface leads to the production of OH radicals in the solution which are efficiently scavenged by TRIS.
{"title":"Experimental setup for probing electron-induced chemistry in liquid micro-jets","authors":"Pamir Nag, Miloš Lj. Ranković, H. Christian Schewe, Jozef Rakovský, Leo Sala, Jaroslav Kočišek, Juraj Fedor","doi":"10.1088/1361-6455/ad0205","DOIUrl":"https://doi.org/10.1088/1361-6455/ad0205","url":null,"abstract":"Abstract We present an experimental setup for probing chemical changes in liquids induced by electron collisions. The setup utilizes a custom-designed electron gun that irradiates a liquid microjet with an electron beam of tunable energy. Products of the electron-induced reactions are analyzed ex-situ . The microjet system enables re-circulation of the liquid and thus multiple irradiation of the same sample. As a proof-of-principle experiment, an aqueous solution of TRIS (2-Amino-2-(hydroxymethyl)propane-1,3-diol) was irradiated by 300 eV electron beam. Optical UV–VIS analysis shows that the electron impact on the liquid surface leads to the production of OH radicals in the solution which are efficiently scavenged by TRIS.","PeriodicalId":16799,"journal":{"name":"Journal of Physics B","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135667452","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}
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