Abstract
The beam from a Q-spoiled ruby laser is focused on a graphite block maintained under vacuum. The C2 Swan system is produced and the fluorescence decay time is interpreted as the lifetime of the A 3IIg state of C2. The lifetimes of four different vibronic levels of that state are measured. The variation of the electronic part of the transition moment over the nuclear coordinates is deduced from the spread of the lifetime values. The oscillator strength f(0, 0) for the Swan system is calculated to be (4.33±0.12) 10−3.
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