Observation of mixed acetylene - Nitrous oxide trimers: Infrared spectra of C2H2-(N2O)2 and (C2H2)2-N2O

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DOIResolve DOI: http://doi.org/10.1016/j.jms.2014.10.001
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TypeArticle
Journal titleJournal of Molecular Spectroscopy
ISSN0022-2852
Volume306
Pages610; # of pages: 5
SubjectInfrared spectrum; Nitrous oxide; Van der Waals clusters
AbstractInfrared spectra of the lowest energy isomers of C2H2-(N2O)2 and (C2H2)2-N2O were observed in the region of the ν1 fundamental band of the N2O monomer (∼2224 cm-1) using a tunable diode laser and/or a CW quantum cascade laser to probe a pulsed supersonic slit jet expansion. One infrared band was measured for each trimer. The band for C2H2-(N2O)2 corresponds to the out-of-phase vibrations of the pair of equivalent N2O monomers. It is blue shifted by about 10 cm-1 with respect to the free N2O monomer. The band for (C2H2)2-N2O is slightly less blue shifted (centered at 2232.81 cm-1). It can be simulated as a predominately a-type band. In addition to the normal isotopologues, the corresponding bands for C2D2-(N2O)2 and (C2D2)2-N2O were also observed. The structures of these trimers are similar to those of the lowest energy isomers of the analogous OCS - acetylene trimers reported previously, that is, a twisted barrel with C2 symmetry for C2H2-(N2O)2 and a distorted T-shaped acetylene dimer with a coplanar N2O beside the stem of the T for (C2H2)2-N2O. Here, we present our observation and experimental results, which agree well with calculations based on distributed multipole pair potentials.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21272792
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Record identifier0163535c-e3d9-4fd0-802c-959924160626
Record created2014-12-03
Record modified2016-05-09
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