CO dimer: the infrared spectrum revisited

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Journal titleJournal of Physical Chemistry A
Pages96129620; # of pages: 9
SubjectBroad bands; Infrared spectrum; Intermolecular vibrations; Rotational levels; Rotational temperature; Splittings; Supersonic jet expansion; Very low frequency; Isomers; Quantum cascade lasers; Supersonic aerodynamics; Spectroscopy
AbstractA broad-band (2135-2200 cm-¹) infrared spectrum of the CO dimer is recorded using a tunable quantum cascade laser to probe a supersonic jet expansion with an effective rotational temperature of about 2.5 K. Analysis of the spectrum reveals the first known levels of the excited state (vCO = 1) with A+ symmetry and establishes that resonant vibrational splittings are small (<0.2 cm-¹) for both the C-bonded and O-bonded dimer isomers. The spectrum extends over a surprisingly large range, with somewhat reduced intensity above 2150 cm-¹. A total of 28 new "stacks" of rotational levels having A- symmetry are assigned for vCO = 1 on the basis of combination differences, adding to the 8 stacks previously known, and extending up to 51 cm-¹ above the vCO = 1 origin. Assignments are given for the first 13 stacks of vCO = 1 in terms of the very low frequency geared bending intermolecular vibration.
Publication date
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270504
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Record identifierd0af8ec1-51fa-4f6c-b32d-b0487dbbe041
Record created2014-02-14
Record modified2016-05-09
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