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Helium cryosorption features determined by its superfluidity
Helium becomes superfluid under certain conditions. The authors' aim is to study the superfluidity effect on cryolayers sorptional features. Experimental research was conducted to determine the dependence of gaseous helium pressure, over various gas cryolayers, with concentration and temperatur...
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Published in: | Vacuum 1997-09, Vol.48 (7), p.747-749 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Online Access: | Get full text |
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Summary: | Helium becomes superfluid under certain conditions. The authors' aim is to study the superfluidity effect on cryolayers sorptional features.
Experimental research was conducted to determine the dependence of gaseous helium pressure, over various gas cryolayers, with concentration and temperature.
An abrupt pressure drop over argon and nitrogen cryolayers was registered at the temperature value at which helium transformed into a superfluid. An abrupt increase in the sorption heat corresponds to this pressure change. The authors believe that the pressure drop effect is explained by the fact that helium fills earlier inaccessible pores, thus causing the decrease of helium concentration over the cryolayer.
This phenomenon gives an opportunity to improve cryosorption pump characteristics, to pump gaseous media with large quantities of helium. |
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ISSN: | 0042-207X 1879-2715 |
DOI: | 10.1016/S0042-207X(97)00065-1 |