Table of Contents
Laser Chemistry
Volume 13, Issue 1, Pages 43-55
http://dx.doi.org/10.1155/1993/56828

Laser Induced Fluorescence From CF2 Excited at 248 Nm

1Former Central Institute of Physical Chemistry, Rudower Chaussee 5, Berlin O-1199, Germany
2Germanenstr. 98, Berlin O-1185, Germany
3Ortolfstr.150, Berlin O-1185, Germany
4Ortolfstr. 172, Berlin O-1185, Germany

Received 18 February 1993

Copyright © 1993 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

KrF–laser-induced fluorescence from CF2-radicals was investigated during photolysis of CF2Cl2 and CF2HCl by 193 nm laserlight. In contrast to other publications, which postulated single-vibronic-level fluorescence, the fluorescence is caused by excitation from four closely situated absorption bands. These fluorescence bands of four series, are assigned to Ã1B1(v1,62v1,0)X˜1A1(v1,v2,0) transitions with Δv1=0 and 0 ≤ v2 ≤ 30. The Franck – Condon factors of the Ã1B1 (0, 6, 0) –X˜1A1 (0, v2, 0) transitions, the frequencies of the bending vibration (ω2 =673± 2cm–1) and the anharmonicity constants x22 = –0.94 ± 0.08 cm-1 and x22 = –0.44 ± 0.10 cm–1 were more precisely determined. For the first time higher anharmonicity constants are evaluated with x12 + x112 = –3.5 ± 1.0 cm–1 and x122= –0.05 ± 0.02 cm–1.