Infrared and Microwave Spectra of the N₂–Propyne van der Waals Cluster

Author： Tseng S-H. Eggers D.F. Blake T.A. Beck R. Watts R.O. Lovas F.J. Zobov N.

ISSN： 0022-2852

Source： Journal of Molecular Spectroscopy, Vol.182, Iss.1, 1997-03, pp. : 132-147

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Abstract

The infrared spectrum of¹⁴N₂–CH₃CCH in the 3.0-μm region has been observed and the rovibrational transitions have been assigned for theA(m= 0) andE(m= ±1) methyl top internal rotor states of this near slipped parallel van der Waals molecule. TheE-state transitions were used to estimate the barrier to internal rotation as 10 cm^-1. The observedA-state microwave transitions of¹⁴N₂–CH₃CCH,¹⁵N₂&# 150;CH₃CCH, and¹⁵N₂–CH₃CCD are split into doublets. This doublet splitting, which is too small to be observed in the infrared spectrum, is attributed to the internal motion of the N₂moiety about an axis connecting the centers-of-mass of the molecules in the cluster; i.e., the N₂molecule rotates out of the heavy atom plane of the cluster. The splittings in the microwave spectra were fit to a barrier height of 71 cm^-1for the hindered N₂motion.