Computation of oscillator strengths by a semiempirical method for some elements of the iron group and their solar photospheric abundance

Solar Physics ◽  
1974 ◽  
Vol 39 (2) ◽  
pp. 305-308 ◽  
Author(s):  
E. Bi�mont
Keyword(s):  
Semiempirical Method ◽  
Oscillator Strengths ◽  
Iron Group

Adiabatic Potentials and Oscillator Strengths of Thallium-Noble Gas Atom Pairs

1982 ◽  
Vol 37 (4) ◽  
pp. 325-333
Author(s):  
E. Czuchaj
Keyword(s):  
Noble Gas ◽  
Semiempirical Method ◽  
Oscillator Strengths ◽  
Continuum Emission ◽  
Interatomic Potentials ◽  
Internuclear Separation ◽  
Molecular Oscillator ◽  
Asymptotic Values ◽  
Atom Pairs

Abstract Baylis' semiempirical method has been applied for calculating interatomic potentials and oscillator strengths as a function of internuclear separation of the thallium-noble gas systems. The new potentials for the four lowest molecular states of each diatomic have been compared with the corresponding ones deduced by Cheron et al. from the measurement of continuum emission intensities on the extreme wings of the Tl resonance lines due to noble gas perturbers. The calculated potentials differ considerably from the latter ones. The molecular oscillator strengths have been calculated for both the allowed and the forbidden Tl transitions. The asymptotic values of the first ones are compared with the corresponding atomic oscillator strengths of other calculations and measurements. The agreement is generally quite good.

scholarly journals The FERRUM Project: Oscillator Strengths of the Iron Group Elements: Fe II

2002 ◽  
Vol 12 ◽  
pp. 84-87 ◽  
Author(s):  
Sveneric Johansson
Keyword(s):  
International Collaboration ◽  
Plasma Diagnostics ◽  
Oscillator Strengths ◽  
Iron Group ◽  
Astrophysical Data ◽  
Selection Of

AbstractWe report on an international collaboration, the FERRUM Project, which aims at extending the database of experimental oscillator strengths for iron group elements and possibly evaluating theoretical and astrophysical data. The selection of individual projects is made with respect to their relevance for abundance work and plasma diagnostics in astrophysics. In this paper we present recent measurements of gf-values in Fe II. We also report on the first measurements of forbidden lines of the same spectrum, [Fe II].

Theoretical relativistic oscillator strengths I. Transitions in principal, sharp, and diffuse series of Al I, Ga I, In I, and Tl I spectra

1976 ◽  
Vol 54 (2) ◽  
pp. 118-129 ◽  
Author(s):  
J. Migdałek
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Principal Series ◽  
Semiempirical Method ◽  
Oscillator Strengths ◽  
Relative Line ◽  
Exchange Effects ◽  
The One ◽  
Relativistic Oscillator ◽  
Good Agreement

The oscillator strengths for the sharp, principal, and diffuse series in the spectra of Al I, Ga I, In I, and Tl I are calculated as well as the lifetimes of their lowest excited states. The wave functions that were used were calculated by employing a relativistic semiempirical method which included exchange effects. Very good agreement with the most reliable experimental data was obtained for the fik values in the sharp series as well as for the calculated lifetimes. The discrepancies in the diffuse series are ascribed to the failure of the one-electron approach in the case of strongly perturbed series. The observed deviations in the relative line strengths from the values predicted neglecting the spin–orbit interaction were also investigated. Some systematic trends in the calculated oscillator strengths that were found for the sharp and principal series appear to be corroborated by experimental data for the sharp series in the spectra of Al I, Ga 1, In I.andTl 1.

Sign in / Sign up

Export Citation Format

Share Document