Abstract
A recent proposal by Maris,1 that single electron bubbles in helium might fission into separate, particle-like entities, does not properly take into account the failure of the adiabatic approximation when, due to tunneling, there is a long electronic time scale. The point along the fission pathway of a photoexcited p-state bubble, where the adiabatic approximation first breaks down, occurs well before the bubble waist has pinched down forming two cavities. In the connected two-lobed geometry, the p- and s-states are strongly mixed by an antisymmetric vibrational mode, and the excitation decays by the mechanism where one lobe collapses while the other expands into the spherical s-state geometry. The extreme pressure jump in a photoexcited bubble leads to shock formation that may halt the elongation even before adiabaticity is compromised. In this case, the photoexcited bubble decays radiatively from the relaxed p-state geometry.
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An erratum to this article is available at http://dx.doi.org/10.1007/s10909-015-1291-0.
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Elser, V. Indivisibility of Electron Bubbles in Helium. Journal of Low Temperature Physics 123, 7–23 (2001). https://doi.org/10.1023/A:1017534129860
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DOI: https://doi.org/10.1023/A:1017534129860