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CORE-EXCITATION EFFECTS ON ATOMIC TRANSITIONS
by
Yuxiang Luo
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(PHYSICS AND ASTRONOMY)
December 2008
Copyright 2008 Yuxiang Luo
Object Description
| Title | Core-excitation effects on atomic transitions |
| Author | Luo, Yuxiang |
| Author email | yuxiangl@usc.edu; yuxiangl@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Physics |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2008-09-11 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-10-10 |
| Advisor (committee chair) | Chang, Tu-nan |
| Advisor (committee member) |
Dappen, Werner Shakeshaft, Robin Judge, Darrell Hwang,Kai |
| Abstract | By including explicitly the electronic configurations with three simultaneously excited electronic orbitals, we have successfully extended the BSCI (B-spline based configuration interaction) method to estimate directly the effects of inner shell core-excitation to atomic transitions. In particular, we are able to carry out detailed ab initio investigation on the core polarization effects without the use of parameterized model potential. We investigate in detail quantitatively the change in atomic transition rate due to the core-excitations for four-electron systems, especially for transitions involving double excited states and those with small oscillator strengths. Quantitatively, for the Be-like systems, we are able to achieve an agreement between the length and velocity results to better than 1% for most transitions. Applications to neutral Carbon also demonstrate the effectiveness of the extended BSCI methods to treat explicitly the core-excitation in atomic transitions. A typical extended BSCI calculation requires substantially more computational effort than other L2 methods. It can only be carried out under the parallel computing environment. With the ongoing hardware upgrading from 32-bit to 64-bit computing environment, we anticipate a more comprehensive extended BSCI study on Carbon-like ions and heavier atomic systems with 2 closed shells such as Si-like ions in coming years. |
| Keyword | atomic transition; Be-like ions; carbon; core-excitation; multi-electron interaction; oscillator strength |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m1654 |
| Rights | Luo, Yuxiang |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Luo-2423 |
| Archival file | uscthesesreloadpub_Volume26/etd-Luo-2423.pdf |
Description
| Title | Page 1 |
| Full text | CORE-EXCITATION EFFECTS ON ATOMIC TRANSITIONS by Yuxiang Luo A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (PHYSICS AND ASTRONOMY) December 2008 Copyright 2008 Yuxiang Luo |
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