Abstract
This paper concerns the properties of localized states of a light particle (e.g. electron, positron or positronium atom) thermalized in a fluid. In contrast with the more familiar Anderson localization which occurs in solids, in a fluid the atoms are free to rearrange their positions in the vicinity of the light particle and therefore participate in the formation of the average quantum state. Because electron localization affects the mobility of the charge carrier more than any other single factor, it has important consequences for charge transfer. In the following I will describe the experimental evidence for the existence of localized states and how positron annihilation provides a useful window for observing their properties. I will then introduce the theoretical models which have proven helpful for predicting the equilibrium structures and compare their relative merits. As an example, I will conclude with new results obtained from an application of the path integral to the behavior of a positron in Xenon.
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Miller, B.N. (1992). Positron Annihilation as a Probe of Localized States in Fluids. In: Proto, A.N., Aliaga, J.L. (eds) Condensed Matter Theories. Condensed Matter Theories, vol 7. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3352-8_13
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