Abstract/Details

Atomic data for spectral analysis


1998 1998

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Abstract (summary)

Collisional excitation and ionization cross sections suitable to highly excited states of the target atom at low and intermediate kinetic energy of the scattering particle have been derived following the semiclassical Impact Parameter approximation. An analytical expression for cross section involving transitions with $\Delta l > 1$ has been obtained when the semiclassical requirement and the Ehrhardt conditions are valid. The analytical cross sections are explicit functions of the initial quantum number of the target atom, the incident velocity of the colliding particle and $\Delta n$ (for bound-bound transitions), allowing a generalization to any transition needed in a spectral modeling code. The cross sections obtained with the Impact Parameter approximation present a close agreement with previous theoretical results for dipole and quadrupole ($\Delta l$ = 2) cross sections of bound-bound transitions. Results of octupolar ($\Delta l$ = 3) cross sections are also given for $\Delta n$ = 1 and $\Delta n$ = 2 and a wide range of incident energies. The results indicate that the cross sections corresponding to transitions with $\Delta l > 1$ are significant up to incident energies about 100 times the transition energy. The Impact Parameter cross sections for bound-free transitions present a very good agreement with experimental values, in particular at low incident energies.

Indexing (details)


Subject
Atoms & subatomic particles;
Astronomy;
Astrophysics
Classification
0748: Atoms & subatomic particles
0606: Astronomy
0606: Astrophysics
Identifier / keyword
Pure sciences, Collisional excitation, Excited states, Ionization cross-section
Title
Atomic data for spectral analysis
Author
Grimberg, Bruna Irene
Number of pages
107
Publication year
1998
Degree date
1998
School code
0118
Source
DAI-B 59/10, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599073296, 0599073292
Advisor
Walker, James F.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9909167
ProQuest document ID
304429710
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304429710
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