Collisional Broadening of Rotational Lines in the Stimulated Raman Pentad Q-Branch of CD4

0022-4073Self- and argon-broadening coefficients are reported for a number of Raman Q-branch transitions in the v1 and v2 + v4 bands of 12CD4 at room temperature (296 K). The coefficients display a variation with j and with Cn (symmetry species A, E, F) that is essentially independent of collision partner and which is similar to the j- and Cn- dependence found in previous measurements of the i.r. line-broadening coefficients. The rotationally inelastic collision rates previously measured by Foy et al for 13CD4 (upsilon(4) = 0, 1) in collision with 13CD4 or Ar account for only a part of the Raman broadening rate, suggesting possibly significant contributions to the linewidths from efficient V-V transfer or elastic dephasing collisions