Photoionization of ground and excited states of Ti I

被引：4

作者：

Nahar, Sultana N. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

来源：

NEW ASTRONOMY | 2015年 / 38卷

基金：

美国国家科学基金会;

关键词：

Photoionization of Ti I; Cross sections of excited levels; R-matrix method; Resonant features; ATOMIC DATA; IRON PROJECT; TRANSITION-PROBABILITIES; OPACITY CALCULATIONS; TITANIUM; SPECTROSCOPY;

D O I：

10.1016/j.newast.2015.01.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detailed photoionization of ground and many excited states with autoionizing resonances of neutral Ti are presented. Ti I with 22 electrons forms a large number of bound states, the present work finds a total of 908 bound states with n <= 10 and l <= 8. Photoionization cross sections (sigma(PI)) for all these bound states have been obtained. Calculations were carried out in the close-coupling R-matrix method using a wave function expansion that included 36 states of core ion Ti II. It is found that the resonances enhance the low energy region of photoionization of the ground and low lying excited states. The resonant features will increase the opacity, as expected of astrophysical observation, and hence play important role in determination of abundances in the elements in the astronomical objects. The excited states also show prominent structures of Seaton or photo-excitation-of-core resonances. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：16 / 22

页数：7

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