Infrared spectra of isotopic CO[sub 2]--He complexes

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Journal titleThe Journal Of Chemical Physics
Pages1143105; # of pages: 114306
Subjectcarbon compounds; helium; infrared spectra; isotope effects; molecular configurations; potential energy surfaces; quasimolecules; rotational states
AbstractInfrared spectra of three isotopic forms of the weakly bound CO2–He van der Waals complex have been studied in the region of the CO2 nu3 fundamental band around 2300 cm–1, using a tunable diode laser to probe a pulsed supersonic expansion. The complex is a T-shaped near-oblate asymmetric rotor, and it is found that 18O isotopic substitution is sufficient to interchange the a and b inertial axes. For the symmetric isotopes, such as the normal species and the 16O13C16O and 18O13C18O forms studied here, half of the normal rotational levels of the complex are missing due to the effects of 16O (or 18O) interchange symmetry. However, for asymmetrically substituted ones, such as 16O13C18O, all rotational levels are present. Moreover, for the asymmetric isotope, both a- and b-type transitions were observed, so that the spectrum was much richer. The CO2–He system is of interest both as a benchmark for intermolecular potential energy surface calculations, and because CO2 is a valuable probe molecule for helium cluster spectroscopy.
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
NPARC number12327821
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Record identifiereeedf676-977e-4e6e-b0bd-7205de193c76
Record created2009-09-10
Record modified2016-05-09
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