PERTURBATIONS IN THE 3$\mu$ VIBRATIONAL SPECTRUM OF THE ACETYLENE--CARBON MONOXIDE VAN DER WAALS MOLECULE, HCCH-CO

1. M.D. Marshall, D.G. Prichard, and J.S. Muenter, J. Chem. Phys. 90, 6049 (1989).""Author Institution: Department of Chemistry, University of North Carolina; Department of Chemistry, University of Rochester; Department of Chemistry, Amherst CollegeIn the analysis of the 3$\mu $ vibration-rotation spectrum of HCCH-$^{12}CO$, several lines showed the effects of a perturbation to the upper state. $^{1}$ These included shifts from the expected transition frequency and the appearance of extra, weak features in the spectrum. This perturbation has been found to persist in the analogous spectrum of the HCCH-$^{13}{CO}$ isotopomer suggesting that a combined analysis of the two isotopic species may shed additional light on the nature of the perturbing state or states. The original spectrum of HCCH-$^{12}{CO}$ has been re-recorded with greater resolution and additional sensitivity. This has allowed a more precise measurement of the additional, weak, perturbation-induced lines in the spectrum. In addition the spectrum of HCCH-$^{13}{CO}$ has confirmed the previously proposed linear, carbon-bonded structure for the molecule. Session in which paper is recommended for presentation: (9) Molecular bea