Pub Date : 2020-07-10DOI: 10.1103/physreva.102.052823
K. Hansen
The thermal electron emission rate constant for C$_{60}^-$ has been deduced over a range of 4 eV internal energy from storage ring measurements of the decays of ions reheated with single photons absorption. The thermal radiation from the ions is quantified with respect to continuous cooling and discrete photon quenching.
{"title":"C60−\u0000 thermal electron-emission rate","authors":"K. Hansen","doi":"10.1103/physreva.102.052823","DOIUrl":"https://doi.org/10.1103/physreva.102.052823","url":null,"abstract":"The thermal electron emission rate constant for C$_{60}^-$ has been deduced over a range of 4 eV internal energy from storage ring measurements of the decays of ions reheated with single photons absorption. The thermal radiation from the ions is quantified with respect to continuous cooling and discrete photon quenching.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126232485","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 : 2020-02-22DOI: 10.1103/PHYSREVRESEARCH.2.033525
Suying Bai, Xiaoxuan Han, Jingxu Bai, Y. Jiao, Jianming Zhao, Suotang Jia, G. Raithel
Cs$_2$ Rydberg-ground molecules consisting of a Rydberg, $nD_{J}$ (33 $leq$ $n$ $leq$ 39), and a ground state atom, 6$S_{1/2} (F=$3 or 4$)$, are investigated by photo-association spectroscopy in a cold atomic gas. We observe vibrational molecular spectra that correspond to triplet $^TSigma$ and mixed $^{S,T}Sigma$ molecular states. We establish scaling laws for the ground-state molecular binding energies as a function of effective principal quantum number, and obtain zero-energy singlet and triplet $s$-wave scattering lengths from experimental data and a Fermi model. The permanent electric dipole moments of the molecules are attained by analyzing line broadening in external electric fields. We find qualitative agreement between measured and calculated magnitudes of the dipole moment. The sign of the dipole moment is predicted to be negative, which differs from previously reported cases.
{"title":"Cesium \u0000nDJ+6S1/2\u0000 Rydberg molecules and their permanent electric dipole moments","authors":"Suying Bai, Xiaoxuan Han, Jingxu Bai, Y. Jiao, Jianming Zhao, Suotang Jia, G. Raithel","doi":"10.1103/PHYSREVRESEARCH.2.033525","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.033525","url":null,"abstract":"Cs$_2$ Rydberg-ground molecules consisting of a Rydberg, $nD_{J}$ (33 $leq$ $n$ $leq$ 39), and a ground state atom, 6$S_{1/2} (F=$3 or 4$)$, are investigated by photo-association spectroscopy in a cold atomic gas. We observe vibrational molecular spectra that correspond to triplet $^TSigma$ and mixed $^{S,T}Sigma$ molecular states. We establish scaling laws for the ground-state molecular binding energies as a function of effective principal quantum number, and obtain zero-energy singlet and triplet $s$-wave scattering lengths from experimental data and a Fermi model. The permanent electric dipole moments of the molecules are attained by analyzing line broadening in external electric fields. We find qualitative agreement between measured and calculated magnitudes of the dipole moment. The sign of the dipole moment is predicted to be negative, which differs from previously reported cases.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122347584","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 : 2019-10-13DOI: 10.1615/nanoscitechnolintj.2020033951
Z. Ahmed, A. Bhargav
CO2 cooling systems are the wave of the future for industrial refrigeration. CO2 refrigeration systems are gaining traction in recent years which involves heat transfer between CO2 and the base fluid. The high viscosity of CO2 is of interest to the oil and gas industry in enhanced oil recovery and well-fracturing applications. A need arises to improve the thermal conductivity and viscosity of CO2 to increase the efficiency of these significant applications. Aggregation of nanoparticles is one of the crucial mechanisms to improve the thermal conductivity and viscosity of nanofluids. Since the aggregation morphology of nanoparticles is unclear so far, we have evaluated the stable configurations of the aggregation of nanoparticles by determining the potential energy of the different configurations system. In this paper, Green-Kubo formalism is used to calculate the mentioned thermo-physical properties of the different aggregated nanofluids. The nanofluid in this study consists of alumina (Al2O3) nanoparticles and CO2 as a base fluid. Results indicate that the enhancement in the thermal conductivity and viscosity of nanofluid is inversely proportional to the potential energy of the system. The results also mark that various morphologies of the aggregated nanoparticles have different enhancements of thermo-physical properties of the nanofluid. This study is conducive for the researchers to perceive the importance and influence of aggregation morphology of nanoparticles and their stability on the thermal conductivity and viscosity of nanofluid.
{"title":"EFFECT OF AGGREGATION MORPHOLOGY ON THERMAL CONDUCTIVITY AND VISCOSITY OF Al2O3-CO2 NANOFLUID: A MOLECULAR DYNAMICS APPROACH","authors":"Z. Ahmed, A. Bhargav","doi":"10.1615/nanoscitechnolintj.2020033951","DOIUrl":"https://doi.org/10.1615/nanoscitechnolintj.2020033951","url":null,"abstract":"CO2 cooling systems are the wave of the future for industrial refrigeration. CO2 refrigeration systems are gaining traction in recent years which involves heat transfer between CO2 and the base fluid. The high viscosity of CO2 is of interest to the oil and gas industry in enhanced oil recovery and well-fracturing applications. A need arises to improve the thermal conductivity and viscosity of CO2 to increase the efficiency of these significant applications. Aggregation of nanoparticles is one of the crucial mechanisms to improve the thermal conductivity and viscosity of nanofluids. Since the aggregation morphology of nanoparticles is unclear so far, we have evaluated the stable configurations of the aggregation of nanoparticles by determining the potential energy of the different configurations system. In this paper, Green-Kubo formalism is used to calculate the mentioned thermo-physical properties of the different aggregated nanofluids. The nanofluid in this study consists of alumina (Al2O3) nanoparticles and CO2 as a base fluid. Results indicate that the enhancement in the thermal conductivity and viscosity of nanofluid is inversely proportional to the potential energy of the system. The results also mark that various morphologies of the aggregated nanoparticles have different enhancements of thermo-physical properties of the nanofluid. This study is conducive for the researchers to perceive the importance and influence of aggregation morphology of nanoparticles and their stability on the thermal conductivity and viscosity of nanofluid.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115497923","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}
The electronic structure calculation for the nanoclusters of (AsSiTeB/SiAsBTe) quaternary semiconductor alloy belonging to the (III-V Group elements) is performed. The two clusters one in the linear form and the other in the bent form have been studied under the framework of Density Functional Theory (DFT) using the B3LYP functional and LANL2DZ basis set with the software packaged GAUSSIAN 16 . We have discussed the Optimised Energy, Frontier Orbital Energy Gap in terms of HOMO-LUMO, Dipole Moment, Ionisation Potential, Electron Affinity, Binding Energy and Embedding Energy value in the research work and we have also calculated the Density of States (DoS) spectrum for the above quaternary system for two nanoclusters. The application of these compounds or alloys are mainly in the Light emitting diodes. Motivation for this research work is to look for electronic and geometric data of nanocluster (AsSiTeB/SiAsBTe).
{"title":"Electronic structure calculations on GaInNAs/GaNInAs nanostructures using density functional theory","authors":"Ankit Kargeti, Ravikant Shrivastav, T. Rasheed","doi":"10.1063/5.0016651","DOIUrl":"https://doi.org/10.1063/5.0016651","url":null,"abstract":"The electronic structure calculation for the nanoclusters of (AsSiTeB/SiAsBTe) quaternary semiconductor alloy belonging to the (III-V Group elements) is performed. The two clusters one in the linear form and the other in the bent form have been studied under the framework of Density Functional Theory (DFT) using the B3LYP functional and LANL2DZ basis set with the software packaged GAUSSIAN 16 . We have discussed the Optimised Energy, Frontier Orbital Energy Gap in terms of HOMO-LUMO, Dipole Moment, Ionisation Potential, Electron Affinity, Binding Energy and Embedding Energy value in the research work and we have also calculated the Density of States (DoS) spectrum for the above quaternary system for two nanoclusters. The application of these compounds or alloys are mainly in the Light emitting diodes. Motivation for this research work is to look for electronic and geometric data of nanocluster (AsSiTeB/SiAsBTe).","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"46 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124177163","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 : 2019-02-28DOI: 10.7546/CRABS.2019.01.04
M. Georgiev, H. Chamati
We study the magnetic excitations of the trimeric magnetic compounds A$_3$Cu$_3$(PO$_4$)$_4$ (A = Ca, Sr, Pb). The spectra are analyzed in terms of the Heisenberg model and a generic spin Hamiltonian that accounts for the changes in valence electrons distribution along the bonds among magnetic ions. The analytical results obtained in the framework of both Hamiltonians are compared to each other and to the available experimental measurements. The results based on our model show better agreement with the experimental data than those obtained with the aid of the Heisenberg model. For all trimers, our analysis reveals the existence of one thin energy band referring to the flatness of observed excitation peaks.
研究了三聚体磁性化合物A$_3$Cu$_3$(PO$_4$)$_4$ (A = Ca, Sr, Pb)的磁激发。光谱是根据海森堡模型和通用自旋哈密顿量来分析的，该自旋哈密顿量解释了磁性离子之间的价电子沿键分布的变化。在这两个哈密顿量的框架内得到的分析结果相互比较，并与现有的实验测量结果进行了比较。与海森堡模型相比，基于该模型的计算结果与实验数据的吻合度更高。对于所有三聚体，我们的分析表明存在一个薄的能带，指的是观察到的激发峰的平坦度。
{"title":"Magnetic Excitations in the Trimeric Compounds A3Cu3(PO4)4(A = Ca, Sr, Pb)","authors":"M. Georgiev, H. Chamati","doi":"10.7546/CRABS.2019.01.04","DOIUrl":"https://doi.org/10.7546/CRABS.2019.01.04","url":null,"abstract":"We study the magnetic excitations of the trimeric magnetic compounds A$_3$Cu$_3$(PO$_4$)$_4$ (A = Ca, Sr, Pb). The spectra are analyzed in terms of the Heisenberg model and a generic spin Hamiltonian that accounts for the changes in valence electrons distribution along the bonds among magnetic ions. The analytical results obtained in the framework of both Hamiltonians are compared to each other and to the available experimental measurements. The results based on our model show better agreement with the experimental data than those obtained with the aid of the Heisenberg model. For all trimers, our analysis reveals the existence of one thin energy band referring to the flatness of observed excitation peaks.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116736090","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}
We investigate the role of exchange bridges in molecular magnets. We explore their effects on the distribution of the valence electrons and their contribution to the exchange processes. The present study is focused on a spin-half dimer with nonequivalent exchange bridges. Here, we derive an effective Hamiltonian that allows for an accurate estimation of the observables associated to the magnetic properties of the magnet. Our results are compared to those obtained by means of the conventional Heisenberg model that usually fails.
{"title":"Magnetic exchange in spin clusters","authors":"M. Georgiev, H. Chamati","doi":"10.1063/1.5091121","DOIUrl":"https://doi.org/10.1063/1.5091121","url":null,"abstract":"We investigate the role of exchange bridges in molecular magnets. We explore their effects on the distribution of the valence electrons and their contribution to the exchange processes. The present study is focused on a spin-half dimer with nonequivalent exchange bridges. Here, we derive an effective Hamiltonian that allows for an accurate estimation of the observables associated to the magnetic properties of the magnet. Our results are compared to those obtained by means of the conventional Heisenberg model that usually fails.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127271539","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}
K. Chartkunchand, M. Stockett, E. Anderson, G. Eklund, M. K. Kristiansson, M. Kamińska, N. Ruette, M. Blom, M. Björkhage, A. Källberg, P. Löfgren, P. Reinhed, S. Rosén, A. Simonsson, H. Zettergren, H. Schmidt, H. Cederquist
A sputter ion source with a solid graphite target has been used to produce dianions with a focus on carbon cluster dianions, $text{C}_{n}^{2-}$, with $n=7-24$. Singly and doubly charged anions from the source were accelerated together to kinetic energies of 10 keV per atomic unit of charge and injected into one of the cryogenic (13 K) ion-beam storage rings of the Double ElectroStatic Ion Ring Experiment facility at Stockholm University. Spontaneous decay of internally hot $text{C}_{n}^{2-}$ dianions injected into the ring yielded $text{C}^{-}$ anions with kinetic energies of 20 keV, which were counted with a microchannel plate detector. Mass spectra produced by scanning the magnetic field of a $90^{circ}$ analyzing magnet on the ion injection line reflect the production of internally hot $text{C}_{7}^{2-}-text{C}_{24}^{2-}$ dianions with lifetimes in the range of tens of microseconds to milliseconds. In spite of the high sensitivity of this method, no conclusive evidence of $text{C}_{6}^{2-}$ was found while there was a clear $text{C}_{7}^{2-}$ signal with the expect isotopic distribution. An upper limit is deduced for a $text{C}_{6}^{2-}$ signal that is two orders-of-magnitue smaller than that for $text{C}_{7}^{2-}$. In addition, $text{C}_{n}text{O}^{2-}$ and $text{CsCu}^{2-}$ dianions were detected.
{"title":"Dianion diagnostics in DESIREE: High-sensitivity detection of $text{C}_{n}^{2-}$ from a sputter ion source.","authors":"K. Chartkunchand, M. Stockett, E. Anderson, G. Eklund, M. K. Kristiansson, M. Kamińska, N. Ruette, M. Blom, M. Björkhage, A. Källberg, P. Löfgren, P. Reinhed, S. Rosén, A. Simonsson, H. Zettergren, H. Schmidt, H. Cederquist","doi":"10.1063/1.501007","DOIUrl":"https://doi.org/10.1063/1.501007","url":null,"abstract":"A sputter ion source with a solid graphite target has been used to produce dianions with a focus on carbon cluster dianions, $text{C}_{n}^{2-}$, with $n=7-24$. Singly and doubly charged anions from the source were accelerated together to kinetic energies of 10 keV per atomic unit of charge and injected into one of the cryogenic (13 K) ion-beam storage rings of the Double ElectroStatic Ion Ring Experiment facility at Stockholm University. Spontaneous decay of internally hot $text{C}_{n}^{2-}$ dianions injected into the ring yielded $text{C}^{-}$ anions with kinetic energies of 20 keV, which were counted with a microchannel plate detector. Mass spectra produced by scanning the magnetic field of a $90^{circ}$ analyzing magnet on the ion injection line reflect the production of internally hot $text{C}_{7}^{2-}-text{C}_{24}^{2-}$ dianions with lifetimes in the range of tens of microseconds to milliseconds. In spite of the high sensitivity of this method, no conclusive evidence of $text{C}_{6}^{2-}$ was found while there was a clear $text{C}_{7}^{2-}$ signal with the expect isotopic distribution. An upper limit is deduced for a $text{C}_{6}^{2-}$ signal that is two orders-of-magnitue smaller than that for $text{C}_{7}^{2-}$. In addition, $text{C}_{n}text{O}^{2-}$ and $text{CsCu}^{2-}$ dianions were detected.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114689940","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 : 2016-10-02DOI: 10.1103/PhysRevA.95.023404
J. Choi, Eonho Chang, Dylan M. Anstine, M. Madjet, H. Chakraborty
We study the photoionization properties of the C_60 versus C_240 molecule in a spherical jellium frame of density functional method. Two different approximations to the exchange-correlation (xc) functional are used: (i) The Gunnerson-Lundqvist parametrization [Phys. Rev. B 13, 4274 (1976)] with an explicit correction for the electron self-interaction (SIC) and (ii) a gradient-dependent augmentation of (i) by using the van Leeuwen and Baerends model potential [Phys. Rev. A 49, 2421 (1994)], in lieu of SIC, to implicitly restore electrons' asymptotic properties. Ground state results from the two schemes for both molecules show differences in the shapes of mean-field potentials and bound-level properties. The choice of a xc scheme also significantly alters the dipole single-photoionization cross sections obtained by an abinitio method that incorporates linear-response dynamical correlations. Differences in the structures and ionization responses between C_60 and C_240 uncover the effect of molecular size on the underlying physics. Analysis indicates that the collective plasmon resonances with the gradient-based xc-option produce results noticeably closer to the experimental data available for C_60.
用密度泛函方法研究了C_60和C_240分子在球形凝胶框架中的光离性质。使用交换相关(xc)泛函的两种不同近似:(i) Gunnerson-Lundqvist参数化[物理学]。通过使用van Leeuwen和Baerends模型势，对电子自相互作用(SIC)和(ii)的梯度依赖性增强(i)进行了明确的修正[物理学报，B 13, 4274(1976)]。Rev. A 49, 2421(1994)]，以代替SIC，隐式恢复电子的渐近性质。两种方案对两种分子的基态结果显示出平均场势的形状和束缚能级性质的差异。xc方案的选择也显著地改变了由线性响应动力学相关的非初始化方法得到的偶极子单光电离截面。C_60和C_240在结构和电离反应上的差异揭示了分子大小对潜在物理特性的影响。分析表明，基于梯度的xc选项的集体等离子体共振产生的结果明显更接近于C_60的实验数据。
{"title":"Effects of exchange-correlation potentials on the density functional description of C_60 versus C_240 photoionization","authors":"J. Choi, Eonho Chang, Dylan M. Anstine, M. Madjet, H. Chakraborty","doi":"10.1103/PhysRevA.95.023404","DOIUrl":"https://doi.org/10.1103/PhysRevA.95.023404","url":null,"abstract":"We study the photoionization properties of the C_60 versus C_240 molecule in a spherical jellium frame of density functional method. Two different approximations to the exchange-correlation (xc) functional are used: (i) The Gunnerson-Lundqvist parametrization [Phys. Rev. B 13, 4274 (1976)] with an explicit correction for the electron self-interaction (SIC) and (ii) a gradient-dependent augmentation of (i) by using the van Leeuwen and Baerends model potential [Phys. Rev. A 49, 2421 (1994)], in lieu of SIC, to implicitly restore electrons' asymptotic properties. Ground state results from the two schemes for both molecules show differences in the shapes of mean-field potentials and bound-level properties. The choice of a xc scheme also significantly alters the dipole single-photoionization cross sections obtained by an abinitio method that incorporates linear-response dynamical correlations. Differences in the structures and ionization responses between C_60 and C_240 uncover the effect of molecular size on the underlying physics. Analysis indicates that the collective plasmon resonances with the gradient-based xc-option produce results noticeably closer to the experimental data available for C_60.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"53 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133561175","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}
The interaction of intense femtosecond laser pulses with atomic Argon clusters has been investigated by using nano-plasma model. Based on the dynamic simulations, ionization process, heating and expansion of a cluster after irradiation by femtosecond laser pulses at intensities up to 2*1017 Wcm-2 are studied. The analytical calculation provides ionization ratefor different mechanisms and time evolution of the density of electrons for different pulse shapes. In this approach the strong dependence of laser intensity, pulse duration and laser shape on the electron energy, the electron density and the cluster size are presented using the intense chirped laser pulses. Based on the presented theoretical modifications, the effect of chirped laser pulse on the complex dynamical process of the interaction is studied. It is found that the energy of electrons and the radius of cluster for the negatively chirped pulsesare improved up to 20% in comparison to the unchirped and positively chirped pulses.
{"title":"The effect of chirped intense femtosecond laser pulses on the Argon cluster","authors":"H. Ghaforyan, R. Sadighi-Bonabi, E. Irani","doi":"10.1155/2016/2609160","DOIUrl":"https://doi.org/10.1155/2016/2609160","url":null,"abstract":"The interaction of intense femtosecond laser pulses with atomic Argon clusters has been investigated by using nano-plasma model. Based on the dynamic simulations, ionization process, heating and expansion of a cluster after irradiation by femtosecond laser pulses at intensities up to 2*1017 Wcm-2 are studied. The analytical calculation provides ionization ratefor different mechanisms and time evolution of the density of electrons for different pulse shapes. In this approach the strong dependence of laser intensity, pulse duration and laser shape on the electron energy, the electron density and the cluster size are presented using the intense chirped laser pulses. Based on the presented theoretical modifications, the effect of chirped laser pulse on the complex dynamical process of the interaction is studied. It is found that the energy of electrons and the radius of cluster for the negatively chirped pulsesare improved up to 20% in comparison to the unchirped and positively chirped pulses.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"33 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132639561","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}
We re-examine the series of resonances found earlier in atomic three-body systems by solving the Faddeev-Merkuriev integral equations. These resonances are rather broad and line-up at each threshold with gradually increasing gaps, the same way for all thresholds and irrespective of the spatial symmetry. We relate these resonances to the Gailitis mechanism, which is a consequence of the polarization potential.
{"title":"Series of broad resonances in atomic three-body systems","authors":"D. Diaz, Z. Papp, C-.Y. Hu","doi":"10.3390/ATOMS4020017","DOIUrl":"https://doi.org/10.3390/ATOMS4020017","url":null,"abstract":"We re-examine the series of resonances found earlier in atomic three-body systems by solving the Faddeev-Merkuriev integral equations. These resonances are rather broad and line-up at each threshold with gradually increasing gaps, the same way for all thresholds and irrespective of the spatial symmetry. We relate these resonances to the Gailitis mechanism, which is a consequence of the polarization potential.","PeriodicalId":296915,"journal":{"name":"arXiv: Atomic and Molecular Clusters","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115550645","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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