Abstract
An infrared absorption spectrum has been observed and analyzed for an Ar– 12C 18O 2 van der Waals (vdW) complex in the range of 2312–2314 cm −1. The effective structure of the complex derived from the obtained rotational constants is in essential agreement with the structure estimated from that of Ar– 12C 16O 2 based on the isotope effect on the amplitudes of vdW vibrations. The band origin for the Ar– 12C 18O 2 ν 4 mode shows a red shift of 0.4567 cm −1 with respect to that for 12C 18O 2 ν 3 mode; the change in the intramolecular potential of CO 2 upon complex formation with Ar is determined from the isotope effect on the band-origin shift.
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