State and energy characterisation of fluorine atoms in the A band photodissociation of F-2

Citation
M. Roth et al., State and energy characterisation of fluorine atoms in the A band photodissociation of F-2, CHEM P LETT, 305(5-6), 1999, pp. 319-326
Citations number
23
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
CHEMICAL PHYSICS LETTERS
ISSN journal
00092614 → ACNP
Volume
305
Issue
5-6
Year of publication
1999
Pages
319 - 326
Database
ISI
SICI code
0009-2614(19990528)305:5-6<319:SAECOF>2.0.ZU;2-9
Abstract
The fluorine photodissociation dynamics in the first absorption band was co mpletely characterised by detection of atomic fluorine using resonantly enh anced multi-photon ionisation (REMPI). Jet-cooled parent molecules were exc ited into the repulsive A(1)Pi(u) state by a 3 sigma(u) <-- 1 pi(g) electro nic transition at 234 nm. Different intermediate excited states of atomic f luorine are observed between 126500 and 128500 cm(-1) in a (3 + 1) ionisati on process. Although the initially excited A(1)Pi(u) state exclusively corr elates to electronic P-2(3/2) ground state atoms, the fragmentation also ge nerates excited P-2(1/2) spin-orbit state atoms. The non-adiabaticity is fa cilitated by the smallness of the spin-orbit splitting E-Omega(F) = 404.1 c m(-1). Both time-of-flight and Doppler linewidth measurements agree with th e calculated photofragments recoil velocity. (C) 1999 Elsevier Science B.V. All rights reserved.