Production of "fast" and "exotic" negative ions in He II.

Williams, Charles D. H. and Hendry, Philip C. and McClintock, Peter V. E. (1987) Production of "fast" and "exotic" negative ions in He II. Japanese Journal of Applied Physics, 26 (Supple). pp. 105-106. ISSN 0021-4922

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The "fast" negative ion provides, in principle, the basis for a determination of the Landau critical velocity for roton creation in Hell under its SVP; but precise measurements will require a more reliable ion source than those reported hitherto. It is known that a glow discharge above the liquid surface is necessary, but not sufficient, for the production of large fluxes of "fast" or "exotic" ions. Several new electrode geometries have been tested with He ll at 1.03K with variable results which are discussed. We report the new observation that the discharge must be white (rather than the more usual violet) for "fast" or "exotic" ions to be generated.

Item Type:
Journal Article
Journal or Publication Title:
Japanese Journal of Applied Physics
Additional Information:
Proceedings of the 18th lnternational Conference on Low Temperature Physics, Kyoto, 1987
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Deposited On:
23 Mar 2010 11:16
Last Modified:
19 Sep 2023 00:26