PRESSURE-INDUCED LINESHIFTS IN THE 2[-0-BAND OF CO SELF-PERTURBED ANDPERTURBED BY HE, KR, O-2, AND N-2

The pressure-induced shifting coefficients for self-, He-, Kr-, O-2-, and N-2-broadened lines of CO in the first overtone band have been mea sured using a tunable difference-frequency laser spectrometer. The lin eshift was directly obtained from the simultaneous record of the press ure-broadened line and the same line of pure CO at low pressure. Compa risons are made with results of theoretical calculations based on a se miclassical model and different interaction potentials. It is shown th at the Lineshifts mainly originate from vibrational dephasing effects. Although the finer details of the J dependence of the shifts are not: accurately reproduced, their general trends are well predicted throug h the calculations. (C) 1996 Academic Press Inc.