http://www.cnr.it/ontology/cnr/individuo/prodotto/ID2380

Squeezing a helium nanodroplet with a Rydberg electron (Articolo in rivista)

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Squeezing a helium nanodroplet with a Rydberg electron (Articolo in rivista) (literal)

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Ancilotto, F; Pi, M; Mayol, R; Barranco, M; Lehmann, KK (2007)
Squeezing a helium nanodroplet with a Rydberg electron
(literal)

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Univ Padua, INFM CNR DEMOCRITOS Natl Simulat Ctr, I-35131 Padua, Italy; Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy; Univ Barcelona, Fac Fis, Dept ECM, E-08028 Barcelona, Spain; Univ Barcelona, IN2UB, E-08028 Barcelona, Spain; Univ Virginia, Dept Chem & Phys, Charlottesville, VA 22904 USA (literal)

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Abstract

We have investigated, by means of density functional theory, the structure of a 'scolium', that is, an electron circulating around a positively charged He-4 nanodroplet, temporarily prevented from neutralization by the helium-electron repulsion. The positive ion core resides in the center of the nanodroplet where, as a consequence of electrostriction, a strong increase in the helium density with respect to its bulk value occurs. The electron enveloping the He-4 cluster exerts an additional electrostatic pressure which further increases the local He-4 density around the ion core. We argue that under such pressure, sufficiently small He-4 nanodroplets may turn solid. The stability of a scolium with respect to electron-ion recombination is investigated. (literal)

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