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Citation 50

Accession Number

003978077

Author

Amusia MYa. Kheifets AS.

Institution

A.F. Ioffe Phys. & Tech. Inst., Acad. of Sci., Leningrad, USSR.

Title

How to explain the difference between ( gamma ,e) and (e,2e) spectroscopic
factors.

Source

Australian Journal of Physics, vol.44, no.2-3, 1991, pp.293-8. Australia.

Country of Publication

Australia.

Abstract

It is shown that the relative line intensity of the main and satellite lines in the atomic shell ionisation spectrum depends significantly on the mechanism responsible for the removal of the electron. This dependence is explained by the influence of many-electron correlations in the initial state of the atom to be ionised, which is considerable when the momentum transferred to the ion is large. This is the case for photoionisation, i.e. the ( gamma ,e) reaction under the condition of large photon energy. On the contrary, in electron momentum spectroscopy, such as the symmetric noncoplanar (e,2e) reaction, the momentum transferred to the ion is typically small and the initial atomic state correlations are negligible. It follows from this that the spectroscopic factors of the different final states of the ion, as defined in the usual way, can be measured only for the (e,2e) reaction, whereas a more involved interpretation is necessary for the ( gamma ,e) reaction. Comparison of the calculated spectroscopic factors of Ar II and Xe II/sup 2/S ion eigenstates with recent ( gamma ,e) and (e,2e) experimental data has confirmed this conclusion. (8 References).

Abstract Number

A91126212

Subject Headings

Electron spectroscopy

Non-Thesaurus Subject Headings

atomic photoionisation.

Key Phrase Identifiers

(gamma,e); main lines; (e,2e) spectroscopic factors; relative line intensity;
satellite lines; atomic shell ionisation spectrum; many-electron
correlations; photoionisation; electron momentum spectroscopy; symmetric
noncoplanar (e,2e) reaction; spectroscopic factors; Ar II; Xe II/sup 2/S ion
eigenstates.

Classification Codes

Atomic photoionization, photodetachment, photoelectron spectra [A3280F];
Electron and ion microscopes and techniques [A0780].

Treatment

Theoretical or mathematical.

CODEN

AUJPAS

Language

English.

ISSN

0004-9506.

U.S. Copyright Clearance Center Code

0004-9506/91/020293$05.00.

Publication Type

Journal Paper.

Update Code

199100.

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