Experimental He-pressure broadening for the R(10) and P(2) lines in the ν 3 band of 13CO 2, and experimental pressure shifts for R(10) measured at several temperatures between 300 K and 100 K

Abstract

Helium broadening coefficients for the R(10) and the P(2) lines in the ν 3 band of 13CO 2 have been measured over a large range of temperature (70 K–300 K). Helium pressure shifts for the R(10) line at several temperatures between 100 K and 300 K have also been determined. These measurements were obtained with a cold Herriott cell, using the collisional cooling technique to reach the lowest temperatures. They provide an extended dataset for the temperature dependence of widths and shifts. This dataset was compared to theoretical He-broadening coefficients combining quantum scattering calculations and the latest potential energy surface for the system He–CO 2 from Korona et al. [T. Korona, R. Moszynski, F. Thibault, J.-M. Maunay, B. Bussery-Honvault, J. Boissoles, P.E.S. Wormer, J. Chem. Phys. 115 (2001) 3074–3084].