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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>1987
<mark>Journal</mark>Japanese Journal of Applied Physics
Number of pages2
<mark>Original language</mark>English


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.

Bibliographic note

Proceedings of the 18th lnternational Conference on Low Temperature Physics, Kyoto, 1987