Rapid Vibrational and Rotational Energy-Transfer Rates in Heated Carbon Dioxide Collisions by Double-Resonance Laser Spectroscopy

摘要

Rates for resonant vibrational and rotational energy transfer from the 001 state by CO sub 2 + CO sub 2 collisions have been measured. All data were obtained by double resonance spectroscopy with CO sub 2 lasers in a 2.5 meter absorption cell at 700 exp 0 K. Results for rotation transfer include pumped-level relaxation and the response of other 001 levels with delta J up to 18. These data are compared to four relevant collision models via a 35-level rate equation analysis. Sequence-band (002 implies 101) and hot-band (011 implies 110) lasting have been used to observe resonant nu sub 3 -transfer relaxation involving 001 + 001 reversible 002 + 000, 001 + 100 reversible 101 + 000, and 001 + 010 reversible 011 + 000. A multilevel rate analysis has been utilized to determine the rate coefficients for 001 going to the 002, the 101, and the 011 levels. Part of the hot-band data has been interpreted as due to 110 + 000 reversible 100 + 010, and the associated rate constant has been estimated. The results of the study are compared to the theory and to other experiments. (ERA citation 07:060318)