Rotational relaxation of HD below 40 K

Sound absorption measurements are reported for the systems HD, HD-He and HD-Ne at a number of temperatures between 20.4 and 42.6 K. for HD the times for relaxation between the rotational and the translational degrees of freedom through collisions with HD and through collisions with He are derived. F...

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Bibliographic Details
Published in:Physica 1970-01, Vol.50 (3), p.433-443
Main Authors: Prangsma, G.J., Heemskerk, J.P.J., Knaap, H.F.P., Beenakker, J.J.M.
Format: Article
Language:English
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Summary:Sound absorption measurements are reported for the systems HD, HD-He and HD-Ne at a number of temperatures between 20.4 and 42.6 K. for HD the times for relaxation between the rotational and the translational degrees of freedom through collisions with HD and through collisions with He are derived. For HD-Ne the present method turns out to be inadequate to determine rotational relaxation times. For HD-HD collisions it is found that the collision number, Z rot, has a temperature - independent value of about 10, whereas for HD-He collisions Z rot is about 17.
ISSN:0031-8914
DOI:10.1016/0031-8914(70)90262-4