Infrared combination and difference bands of the NO dimer

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DOIResolve DOI: http://doi.org/10.1016/j.jms.2006.04.018
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TypeArticle
Journal titleJournal of Molecular Spectroscopy
Volume238
Issue1
Pages127134; # of pages: 8
SubjectCombination bands; Dimer; Force field; Infrared; Nitric oxide
AbstractThe mid-infrared (1500–3800 cm⁻¹) absorption spectrum of gaseous nitric oxide has been studied at low temperature (99 K) with a long absorption path (160 m) in order to observe weak combination, difference, and overtone bands of the NO dimer. About ten new bands were assigned with greater or lesser certainty. Combined with previous results, they lead to a set of 12 secure and 7 tentative vibrational term values for (NO)2, essentially doubling our knowledge of NO dimer vibrational states. The strongest non-fundamental bands in this region, other than the ν1 (symmetric N–O stretch) + ν5 (asymmetric N–O stretch) overtone, involve combinations of ν5 with ν3 (intermolecular stretch). Excitation of ν5 results in increased frequencies for the intermolecular modes ν2, ν3, and ν4. A new value of 155.5 cm⁻¹ was obtained for ν4, the elusive infrared-inactive out-of-plane fundamental vibration.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12327067
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Record identifierdc8579ab-1c41-4adf-bb30-ac578d20cf80
Record created2009-09-10
Record modified2016-05-09
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