Lifetime determination of the long-lived B 1Πg state in He2* by photofragment spectroscopy

✍ Scribed by Martin Kristensen; Søren R. Keiding; Wim J. van der Zande

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 433 KB
• Volume: 164
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)85266-2

✦ Synopsis

In a photofragment spectroscopy experiment, several laser transitions from the B '& to the fast decaying F 'Z: state of He; have been observed. The lifetime of the B 'II, state has been estimated to 1.3 kO.5 ps for both the B 'rI2 and B 'n; components. This lifetime allows for the preparation of fast beams of 'n, Hef molecules, which can form the basis of a detailed spectroscopic study of the singlet system in He;. Since the two parity components of the B 'KI, state can have different dissociation channels, the observation of equal lifetime for the + and -components allows us to give an upper limit on the ratio between dissociation induced by predissociation and radiative decay.