LOW TEMPERATURE HELIUM PRESSURE BROADENING OF OCS, 4-20K
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Date
1994
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Publisher
Ohio State University
Abstract
The pressure broadening cross sections of OCS broadened by helium were measured for the J =1-2, J=2-3 and J=3-4 rotational transitions of OCS. The experiment was performed in a collisionally-cooled cell at temperature ranging from 4-20 K. At 20 K cross sections for all three transitions are 40-50% larger than their 300 K counterparts. From 20 to 4 K cross sections show a slight decrease with temperature and at 4 K are 10-20% larger than the 300 K value. The low temperature data will be compared to cross sections calculated from existing OCS-He potential surfaces and attempts at producing and improved OCS-He potential will be presented.
Description
Author Institution: Department of Physics, Allegheny College