Gerard Meijer, Mattanjah S. De Vries, et al.
The Journal of Chemical Physics
Laser desorption followed by jet cooling has been used to produce an intense beam of internally cooled benzoic acid monomers. As a result, the S1 ← S0 gas-phase absorption spectrum of the jet-cooled benzoic acid monomer could be identified for the first time. Delayed ionization out of a triplet state, populated by rapid S1 → T intersystem crossing, followed by mass-selective detection of the parent ions is performed. The spectral lines have a Lorentzian shape with a line width of 6.5 cm-1, corresponding to an intersystem crossing rate of 1.2 × 1012 s-1. © 1990 American Chemical Society.