LINE SHIFT INVESTIGATIONS FOR DIFFERENT ISOTOPOMERS OF CARBON-MONOXIDE

Line shift coefficients for five lines of five different isotopomers i n the fundamental band of CO in the spectral region near 2058 cm(-1) w ere measured using a three channel lead salt diode laser spectrometer. The study includes the lines P(3) of (CO)-C-13-O-17, R(3) of (CO)-C-1 3-O-18, P(9) of (CO)-C-12-O-18, P(10) Of (CO)-C-13-O-16 and P(21) of ( CO)-C-12-O-16 and covers collisions with N-2, O-2, H-2, D-2, He, Ne, A r, Kr, and Xe. Line shifts of the isotopomers (CO)-C-13-O-16, (CO)-C-1 2-O-16, (CO)-C-13-O-18 and (CO)-C-13-O-17 were determined for the firs t time. Within the experimental uncertainty no significant dependence of the shift effect on the isotopomer was found. The R-branch line und er study shows a smaller line shift coefficient than a P-branch line w ith a similar rotational quantum number. With increasing mass of the n oble gas perturber the absolute size of the shift coefficient increase s. Moreover self- and nitrogen-broadening coefficients for the isotopo mer lines were determined. Compared to previous measurements no signif icant deviations between different isotopomers were observed. (C) 1998 Academic Press.