Stabilized tunable diode laser measurements of the P(2) line in the (CO)-C-13 fundamental band broadened by helium at temperatures between 11.5 and 298.6 K

We determined accurate He-broadening parameters and collisional cross secti ons for the P(2) line in the fundamental band of CO at room temperature and at intermediate temperatures down to 11.5 K. We also determined a precise value for the temperature dependence of the line-broadening parameter on (T )(-n) with n equal to 0.548 +/- 0.010. Our results validate the microwave r esults for the J = 1 to J = 2 rotational transitions measured over the same range of temperatures which were reported previously by Beaky et al. (1996 , J. Chem. Phys. 105, 3994-4004). (C) 2001 Academic Press.