INFRARED-SPECTRUM OF THE CO-XE VANDERWAALS COMPLEX

The first reported spectrum of the CO-Xe van der Waals complex has been studied in the 4.7-μm region of the CO fundamental hand using a long-path (104 m) low-temperature (110 K) static absorption cell and a high-resolution Fourier transform spectrometer. Over 115 lines with J-values up to 38 have been assigned to the perpendicular subbands with K = 1 ← 0 and 0 ← 1. Their analysis yields information on the rotational and centrifugal distortion parameters for the K = 0 and 1, and vco = 0 and 1, states of the complex. The band origin is found to be 2142.406 cm-1, which represents a shift of -0.867 cm-1 from the CO monomer origin. The measured rotational constant for the ground (vco = K = 0) state. B 0.04149 cm-1, corresponds to an effective intermolecular separation of r0 4.195 Å. The observed spectrum is considerably disrupted by the effects of Xe isotope splittings, but it was not possible to make any assignments to individual isotopes. © 1993 Academic Press, Inc.