INFRARED-SPECTRA OF CO-H2 AND CO-D2 VANDERWAALS COMPLEXES IN THE 4.7-MU-M REGION

Well resolved spectra of CO-hydrogen complexes have been observed in the region of the CO fundamental band using a low-temperature (almost-equal-to 50 K) long-path (84 m) absorption cell and a Fourier transform spectrometer. The CO-H-2 and CO-D2 transitions appeared as weak fine structure between the strong lines of the CO monomer. Spectra obtained with the J = 0 hydrogens (para-H-2 or ortho-D2) resembled perpendicular bands of a T-shaped triatomic, and on this basis many lines could be assigned. Further assignments and analysis require feedback from detailed calculations using a realistic potential energy surface.