Evidence of superelastic electron collisions from H-2(+) studied by dissociative recombination using an ultracold electron beam from a cooler ring

Citation
T. Tanabe et al., Evidence of superelastic electron collisions from H-2(+) studied by dissociative recombination using an ultracold electron beam from a cooler ring, PHYS REV L, 83(11), 1999, pp. 2163-2166
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
83
Issue
11
Year of publication
1999
Pages
2163 - 2166
Database
ISI
SICI code
0031-9007(19990913)83:11<2163:EOSECF>2.0.ZU;2-K
Abstract
The dissociative recombination rate of H-2(+) was measured as a function of the storage time with an ultracold electron beam in a storage ring. The H- 2(+) ions vibrationally relax with time, and almost reach the vibrational g round state at a time of 25 s after injection. The magnitude of the ground- state population after 25 s far exceeds that expected based on the initial ground-state population and its decay. This indicates the existence of a su perelastic collision process, where electrons are scattered from excited mo lecular ions and gain energy by vibrational deexcitation.