Observation of D É k 0 l É Å 3 Transitions in the n 3 Band of H
نویسندگان
چکیده
Although the vibration–rotation spectrum of H3O has been studied extensively, there has been no experimental information on the value of the C rotational constant because of the absence of any observed DÉk 0 lÉ x 0 forbidden transitions. However, as pointed out by Verhoeve et al. in their far-infrared spectroscopic work [P. Verhoeve, M. Versluis, J. J. Ter Meulen, W. L. Meerts, and A. Dynamus, Chem. Phys. Lett. 161, 195–201 (1989)], a near degeneracy exists between some (J, 0) and (J, 3) ground state rotation–inversion levels, which causes sizable shifts in these levels due to off-diagonal centrifugal distortion. These shifts were observed in the ground state combination differences of the n3 fundamental transitions. We have observed 11 forbidden DÉk 0 lÉ Å 3 transitions to the n3 band induced by the mixing in the ground state and involving the J Å 7, 9, and 11 levels, and determined the energy difference between different K levels, the C rotational constant, and the off-diagonal centrifugal distortion mixing coefficient. q 1997 Academic Press
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