OPTICAL AND MECHANICAL PROPERTIES OF ELECTRON BUBBLES IN SUPERFLUID HELIUM- 4
Xie Z., Wei W., Yang Y., Maris H.J.

Received: May 14, 2014

DOI: 10.7868/S0044451014120116

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A series of experiments has revealed the existence of a large number (about 18) of different types of negative ions in superfluid helium-4. Despite much effort, the physical nature of these ``exotic ions'' has still not been determined. We discuss possible experiments which may be able to help determine the structure of these objects. Contribution for the JETP special issue in honor of A. F. Andreev's 75th birthday}