On the shape of pressure-broadened absorption lines in the microwave region. II. Collision-induced width and shift of some rotational absorption lines as a function of temperature

Abstract

For pt.I see ibid., vol.10, no.9, p.1735 (1977). A novel method for the determination of line widths and line shifts in the microwave region is described. Experimental results for the line width obtained with rotational transitions of OCS, CH₃Cl and C₃H₄ (propyne) for temperatures ranging from about 140 up to 420K are compared with calculations using Anderson's (1949) as well as Murphy and Bogs' theory (1967), which are modified as in part I. As far as the temperature dependence is concerned, the agreement is satisfactory. However, significant differences between theoretical and experimental results are found with regard to the absolute value of the line width. Deviations from a Lorentzian line shape are observed.