SPECTROSCOPY OF THE $A-X$ TRANSITIONS OF NH-He AND OH-He
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Date
2005
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Ohio State University
Abstract
The NH-He van der Waals complex was characterized via laser excitation of bands associated with the NH $A^{3}\Pi-X ^{3}\Sigma^{-}$ transition. It was demonstrated that the ground state supports a bound level with a rotational constant of $B^{\prime \prime}$= 0.334(2) cm$^{-1}$. These results are in agreement with the predictions of recent high-level theoretical calculations. Spin-orbit predissociation of the excited complex was observed, and the spectra yield insights regarding the NH($A$)+He potential energy surfaces. Features of the OH-He complex have been observed in conjunction with the $A^{2}\Sigma^{+} -$ X$^{2}\Pi$ 0 - 0 transition. The partially resolved bands have been interpreted using the theoretical results of Lee, McCoy, Toczylowski and Cybulski (JCP, 113, 5736, (2000)).
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Author Institution: Department of Chemistry, Emory University, Atlanta, GA 30322