文章基本信息

标题：Excitation and charge transfer in low-energy hydrogen atom collisions with neutral iron ★
本地全文：下载
作者：P. S. Barklem
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：612
DOI：10.1051/0004-6361/201732365
语种：English
出版社：EDP Sciences
摘要：Data for inelastic processes due to hydrogen atom collisions with iron are needed for accurate modelling of the iron spectrum in late-type stars. Excitation and charge transfer in low-energy Fe+H collisions is studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multi-channel Landau–Zener model. An extensive calculation including 166 covalent states and 25 ionic states is presented and rate coefficients are calculated for temperatures in the range 1000–20 000 K. The largest rates are found for charge transfer processes to and from two clusters of states around 6.3 and 6.6 eV excitation, corresponding in both cases to active 4dand 5pelectrons undergoing transfer. Excitation and de-excitation processes among these two sets of states are also significant.
关键词：Key wordsenatomic dataatomic processesline: formationSun: abundancesstars: abundances