Abstract
Profiles of lines in the 3–1 and 2–0 bands of the B 3Π0+←X 1Σ+ system of I35Cl and I37Cl vapor, as well as in several fragmentary P and R branches associated with an adiabatic B′ state, have been recorded using a Fabry–Perot interferometer spectrometer. The potential curves of the B state, and of the adiabatic B′ state formed by an avoided crossing near 3.6 Å and 18 140 cm−1 between the B state and a repulsive Y O+ state, have been determined using the intermediate coupling model of Child. Linewidths in v=2 of the B state are observed to be 0.034 cm−1, independent of J and of isotopic composition; however, linewidths in v=3 are broader, corresponding to predissociative lifetimes in the subnanosecond range, and are found to oscillate as a function of J. The major features of the observed linewidth pattern can be explained in terms of analytical approximations developed by Child and co-workers, and provide evidence for a second curve crossing, near 2.94 Å and 17 975 cm−1, of the B state and an Ω=1 state.
Published Version
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