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

✍ Scribed by Shao-Hui Tseng; David F. Eggers; Thomas A. Blake; Rainer Beck; R.O. Watts; F.J. Lovas; N. Zobov

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
496 KB
Volume
182
Category
Article
ISSN
0022-2852

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✦ Synopsis

The infrared spectrum of 14 N 2 -CH 3 CCH in the 3.0-mm region has been observed and the rovibrational transitions have been assigned for the A (m Å 0) and E (m Å {1 ) methyl top internal rotor states of this near slipped parallel van der Waals molecule. The E-state transitions were used to estimate the barrier to internal rotation as 10 cm 01 . The observed A-state microwave transitions of 14 N 2 -CH 3 CCH, 15 N 2 -CH 3 CCH, and 15 N 2 -CH 3 CCD 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 N 2 moiety about an axis connecting the centers-of-mass of the molecules in the cluster; i.e., the N 2 molecule 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 01 for the hindered N 2 motion. ᭧ 1997 Academic Press mm, room-temperature nozzle at a backing pressure of 1000 1 Present address: Department of Molecular Biotechnology, Fluke Hall, kPa. The molecular beam was collimated using a 190-mm

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