Cavitation in Superfluid Helium Possibly Arising from Penning Ionization of Dimers |
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Authors: | Ambarish Ghosh Humphrey Maris |
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Affiliation: | 1. Department of Physics, Brown University, Providence, RI, 02912
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Abstract: | We have perforated a series of experiments to study cavitation in superfluid helium into which electrons are injected by field-emission from a sharp tip. The injected electrons force open small cavities in the liquid (“electron bubble”). These objects explode at a critical negative pressure P c, and in previous experiments we have studied the cavitation that resugts from these explosions. In the present experiments we have detected cavitation events that occur before a negative pressure as large as P c is reached. We suggest that these events may arise from a process in which two neutral helium dimers interact and an electron is injected into the liquid through Penning ionization. |
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