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Observation of Δ|k − l| = 3 Transitions in the ν3Band of H3O+

✍ Scribed by D. Uy; E.T. White; T. Oka

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
164 KB
Volume
183
Category
Article
ISSN
0022-2852

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✦ Synopsis

Although the vibration-rotation spectrum of H 3 O / 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) 0 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 n 3 fundamental transitions. We have observed 11 forbidden DÉk 0 lÉ Å 3 transitions to the n 3 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.

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