THE VARIABLE TEMPERATURE PRESSURE BROADENING SPECTRUM OF $CH_{3} F$ OF HELIUM

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1994

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Ohio State University

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A system has been developed which has allowed us to measure the helium pressure broadening parameters of $H_{2}S$ and $CH_{3}F$ between approximately 1K and 100K. In combination with other experimental systems, this has allowed measurements over a 1K to 1000K range. This range is wide enough to clearly observe the transition from the high temperature semiclassical regime in which the physics of the collision is properly described by Anderson-like theories to a low temperature regime in which new phenomena associated with quasibound states require a more complete quanmm mechanical description. New results for $CH_{3}F$ helium broadening will be discussed. Some comparisons will be made with measurements of previous experiments and with other molecular systems. The apparatus will be described as will experimental results and their relationship theoretical predictions.

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Author Institution: Department of Physics, The Ohio State University

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