DYNAMICS OF THE FORMATION OF THE ELECTRON BUBBLE
The phenomenon of self-trapping is well known in helium and in different systems, such as electrons in ammonia, Positronium in dense helium gas, and so on. It is known that localization occurs when the balance between exchange repulsive forces, thermal energy, expansion work, and polarization energy is such that the excess free energy of the localized state is lower than that of the extended state. Several physical mechanisms have been proposed to explain how the electron bubble forms, including trapping on virtual or resonant states due to density fluctuations. Stabilization of the localized state is obtained by sound wave emission of the new-born, oscillating bubble. The breathing mode of the cavity around an helium excimer in liquid helium has been also measured.
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