Simultaneous Electron-Photon and Direct Electron Excitation of He 1<sup>1</sup>S–2<sup>3</sup>S — A Field Theoretic Approach
Sujata Bhattacharyya; Sanchita Mitra; Sujata Bhattacharyya; Gokhale Memorial Girls' College, Calcutta, 700 020, India; Sanchita Mitra; Gokhale Memorial Girls' College, Calcutta, 700 020, India
Журнал:
Physica Scripta
Дата:
1999-12-01
Аннотация:
A field theoretic study of the simultaneous electron – photon excitation (SEPE) and direct electron excitation (DEE) is done for He 1<sup>1</sup>S → 2<sup>3</sup>S transition by spin polarized electrons in a field of soft photons. The ratio of SEPE to DEE is found to lie around 3 × 10<sup>-3</sup> for 0.117 eV photons and incident electrons of energy E<sub>i</sub> between 19.817 eV and 20 eV. The present result is compared with the existing experimental data.
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