Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 142, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4914323
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada
- U.S. National Science Foundation (NSF) [CHE-0960074, CHE-1213200]
- Marie Curie fellowship [PIOF-GA-2012-328405]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1213200] Funding Source: National Science Foundation
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All singly substituted C-13, O-18, and S-34 isotopomers of the previously known OCS trimer are observed in natural abundance in a broad-band spectrum measured with a chirped-pulse Fourier transform microwave spectrometer. The complete substitution structure thus obtained critically tests (and confirms) the common assumption that monomers tend to retain their free structure in a weakly bound cluster. A new OCS trimer isomer is also observed, and its structure is determined to be barrel-shaped but with the monomers all approximately aligned, in contrast to the original trimer which is barrel-shaped with two monomers aligned and one anti-aligned. An OCS tetramer spectrum is assigned for the first time, and the tetramer structure resembles an original trimer with an OCS monomer added at the end with two sulfur atoms. Infrared spectra observed in the region of the OCS nu(1) fundamental (approximate to 2060 cm(-1)) are assigned to the same OCS tetramer, and another infrared band is tentatively assigned to a different tetramer isomer. The experimental results are compared and contrasted with theoretical predictions from the literature and from new cluster calculations which use an accurate OCS pair potential and assume pairwise additivity. (C) 2015 AIP Publishing LLC.
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