SATURATION OF MOLECULAR VIBRATIONAL LEVELS BY INFRARED PUMPING.
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Date
1968
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Ohio State University
Abstract
The intense $10.6 \mu$ radiation from a $CO_{2}$ laser is absorbed by a large number of substances, including $SF_{6}, NH_{3}, C_{2}H_{4}, CH_{3}Br$, and $D_{2}CO$. A 4-state linear kinetic model for vibrational saturation is discussed, which predicts equualization of upper and lower level populations at power densities of approximately $10 W. cm^{-1}$. Experimentally, cw infrared saturation has been measured in $SF_{6}$ and other absorbing gases as a function of pressure and added gases. Vibrational deactivation cross sections are derived from these data with the aid of the aforesaid model.
Description
This work was supported by the National Science Foundation.
Author Institution: Department of Chemistry, Massachusetts Institute of Technology
Author Institution: Department of Chemistry, Massachusetts Institute of Technology