Rotational constants of vibrationally excited iodine from purely rotational coherence observed in pump-probe experiments

Pump-probe laser-induced fluorescence techniques are used to determine the rotational constants of vibrationally excited iodine, cooled by supersonic beam expansions. For comparison, it is shown that the results obtained from real time (purely rotational coherence) are in excellent agreement with literature values for the v' = 12-23 of the B state. Results for nascent I_2 (v' = 22), from the predissociation of I_2Ne (v' = 23), are also reported