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VOLUME 65 | ISSUE 6 | PAGE 454
Negative ions in liquid helium: existence of new bound states
It is shown that fundamentally new bound states can be formed when a foreign negative ion is embedded in liquid helium. For such states the excess electron forms a bubble with a radius Ло — 17-18A and a foreign neutral atom is trapped inside this bubble because of the polarization interaction with the electric field of the excess electron, which has a maximum at a point г ~ Ro/2. The main properties of such structures are considered. PACS: 39.60,+f, 67.55.U