天体物理学对多重带电离子碰撞强度的兴趣

IF 1.7 Q3 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL Atoms Pub Date : 2023-05-06 DOI:10.3390/atoms11050080
S. Fritzsche, L. Jiao, Yuancheng Wang, J. Sienkiewicz
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引用次数: 0

摘要

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。
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Collision Strengths of Astrophysical Interest for Multiply Charged Ions
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.
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来源期刊
Atoms
Atoms Physics and Astronomy-Nuclear and High Energy Physics
CiteScore
2.70
自引率
22.20%
发文量
128
审稿时长
8 weeks
期刊介绍: Atoms (ISSN 2218-2004) is an international and cross-disciplinary scholarly journal of scientific studies related to all aspects of the atom. It publishes reviews, regular research papers, and communications; there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles. There are, in addition, unique features of this journal: -manuscripts regarding research proposals and research ideas will be particularly welcomed. -computed data, program listings, and files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Scopes: -experimental and theoretical atomic, molecular, and nuclear physics, chemical physics -the study of atoms, molecules, nuclei and their interactions and constituents (protons, neutrons, and electrons) -quantum theory, applications and foundations -microparticles, clusters -exotic systems (muons, quarks, anti-matter) -atomic, molecular, and nuclear spectroscopy and collisions -nuclear energy (fusion and fission), radioactive decay -nuclear magnetic resonance (NMR) and electron spin resonance (ESR), hyperfine interactions -orbitals, valence and bonding behavior -atomic and molecular properties (energy levels, radiative properties, magnetic moments, collisional data) and photon interactions
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