Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617455g&link_type=abstract
(International Conference on Laboratory Research for Planetary Atmospheres, 2nd, Charlottesville, VA, Oct. 21, 1990, Proceedings
Astronomy and Astrophysics
Astronomy
6
Astronomical Spectroscopy, Atmospheric Chemistry, Atmospheric Models, Gas Giant Planets, Planetary Atmospheres, Pressure Broadening, Atmospheric Composition, Scattering Cross Sections, Spectral Line Width, Vapor Pressure
Scientific paper
Collisional cooling, a new experimental technique which provides a laboratory environment much like that of the outer planets, is described. The basic theory of collisions is set forth, and the results of pressure broadening studies for a number of species are presented. Several systems developed for the study of line widths at temperatures far below those imposed by the usual vapor pressure limitations are described. It is suggested that the behavior of pressure broadening parameters for collisions involving helium are relatively simple at planetary temperatures. The attractive well in the intermolecular potential which causes the quasi-bound state structure observed at very low temperature is relatively shallow. No evidence of these effects being significant above 75 K was found.
de Lucia Frank C.
Goyette Thomas M.
Willey Daniel R.
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