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Theoretical Studies of Atomic Structure, Radiative Transitions and Interference Effects

Andersson, Martin LU (2006)
Abstract
Theoretical calculations concerning the advanced understanding of atomic structure and transitions has been performed for some atomic systems. The importance of different types of correlation depending on system has been investigated both using relativistic and non-relativistic quantum mechanics. Methods for simplifying the analysis of special types of spectra is presented and transition rates and lifetimes for a wide range of different ions and systems are given.



Programs treating ions with or without hyperfine structure in an external magnetic field has been developed. A first test of the accuracy of these has been undertaken, and they have been used in the field free limit to explain the spectra of some hyperfine... (More)
Theoretical calculations concerning the advanced understanding of atomic structure and transitions has been performed for some atomic systems. The importance of different types of correlation depending on system has been investigated both using relativistic and non-relativistic quantum mechanics. Methods for simplifying the analysis of special types of spectra is presented and transition rates and lifetimes for a wide range of different ions and systems are given.



Programs treating ions with or without hyperfine structure in an external magnetic field has been developed. A first test of the accuracy of these has been undertaken, and they have been used in the field free limit to explain the spectra of some hyperfine transitions in Gallium which earlier has not been understood.



New ideas concerning interference between different types of multipole transition channels are presented. It is shown that this interference gives rice to M dependent lifetimes of the magnetic sublevels belonging to the same fine or hyperfine structure level. Some of these interference effects has been known, but to our knowledge this is the first time that the idea of hyperfine and Zeeman induced interference effects are put forward. The theory of hyperfine induced interference between a magnetic octupole and an electric quadrupole transition channel has been used to perform calculations of the lifetime of the first excited level in nickel-like xenon. From our results, an experimental lifetime decay curve which earlier has not been understood, could be reproduced and explained. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Prof. Hibbert, Alan, Queens University of Belfast, United Kingdom
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Naturvetenskap, Natural science, Computational physics, Zeeman, Transition rate, Lifetime, Hyperfine structure, Interference, Atomic structure
pages
272 pages
publisher
Department of Physics, Lund University
defense location
Lecture hall A at the physics department, Sölvegatan 14
defense date
2006-12-09 10:15
language
English
LU publication?
yes
id
f807bd1f-550d-47d6-9785-a2d779b25129 (old id 547629)
date added to LUP
2007-09-28 09:20:24
date last changed
2016-09-19 08:45:12
@phdthesis{f807bd1f-550d-47d6-9785-a2d779b25129,
  abstract     = {Theoretical calculations concerning the advanced understanding of atomic structure and transitions has been performed for some atomic systems. The importance of different types of correlation depending on system has been investigated both using relativistic and non-relativistic quantum mechanics. Methods for simplifying the analysis of special types of spectra is presented and transition rates and lifetimes for a wide range of different ions and systems are given.<br/><br>
<br/><br>
Programs treating ions with or without hyperfine structure in an external magnetic field has been developed. A first test of the accuracy of these has been undertaken, and they have been used in the field free limit to explain the spectra of some hyperfine transitions in Gallium which earlier has not been understood.<br/><br>
<br/><br>
New ideas concerning interference between different types of multipole transition channels are presented. It is shown that this interference gives rice to M dependent lifetimes of the magnetic sublevels belonging to the same fine or hyperfine structure level. Some of these interference effects has been known, but to our knowledge this is the first time that the idea of hyperfine and Zeeman induced interference effects are put forward. The theory of hyperfine induced interference between a magnetic octupole and an electric quadrupole transition channel has been used to perform calculations of the lifetime of the first excited level in nickel-like xenon. From our results, an experimental lifetime decay curve which earlier has not been understood, could be reproduced and explained.},
  author       = {Andersson, Martin},
  keyword      = {Naturvetenskap,Natural science,Computational physics,Zeeman,Transition rate,Lifetime,Hyperfine structure,Interference,Atomic structure},
  language     = {eng},
  pages        = {272},
  publisher    = {Department of Physics, Lund University},
  school       = {Lund University},
  title        = {Theoretical Studies of Atomic Structure, Radiative Transitions and Interference Effects},
  year         = {2006},
}