Coupling Considerations in Two-Electron Spectra Page: 1 of 66
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COUPLING CONSIDERATIONS IN TWO-ELECTRON SPECTRA
Robert D. Cowan >
University of California
Los Alams Scientific Laboratory
Los Alamos, New Mexico
Kenneth L. Andrew
Department of Physics
This paper was submitted for puglicatiOn Purdue University
in the open literature at least 7hhonths Lafayette, Indiana
prior to the issuance date of this Micro-
card. Since the U.S.A.E.C. has no evi-
dence that it has been published, the pa-
per is being distributed in Microcard
form as a preprint. ABSTRACT
The energy level structure, relative line strengths, and Lands
g-factors of two-electron configurations are discussed for four i,-
portant types of pure coupling LS, LK, jK(jf), and jj. Transitions
from one type of coupling to another are discussed in detail, using
the configuration pf as an example. The appropriateness of LS- and
jj-coupling notation in two-electron spectra is quite limited for atoms
of medium atomic weight, where nearly all excited configurations show
a strong tendency toward pair (LK to jK) coupling. For other atoms,
pair coupling occurs mainly for high values of orbital angular momen-
tum of the excited electron; the coupling may be near LK for small
L ,o Gs y
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Cowan, R. D. Coupling Considerations in Two-Electron Spectra, report, January 1, 1964; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1031995/m1/1/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.