PHOTODETACHMENT OF TRAPPED NEGATIVE GOLD IONS - I - EXPERIMENTAL METHODS AND NEAR-THRESHOLD CROSS-SECTIONS

Citation
Rj. Champeau et al., PHOTODETACHMENT OF TRAPPED NEGATIVE GOLD IONS - I - EXPERIMENTAL METHODS AND NEAR-THRESHOLD CROSS-SECTIONS, Journal of physics. B, Atomic molecular and optical physics, 31(2), 1998, pp. 249-259
Citations number
48
Categorie Soggetti
Physics, Atomic, Molecular & Chemical",Optics
ISSN journal
09534075
Volume
31
Issue
2
Year of publication
1998
Pages
249 - 259
Database
ISI
SICI code
0953-4075(1998)31:2<249:POTNGI>2.0.ZU;2-W
Abstract
In this paper and in a subsequent one, we present relative and absolut e measurements of photodetachment cross sections of negative gold ions in an RF trap. Several laser devices needed to be used. Absolute meas urements are possible only when saturation occurs for a reasonable foc using of the laser and are deduced from the variations of photoelectro n yield versus laser pulse energy. We describe the principle behind ou r measurements and we report on the results obtained in the energy ran ge from threshold up to about 4000 cm(-1) above threshold. In this reg ion, we essentially observe a slow departure from Wigner's law (always less than 50%).