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Chemical Physics Letters

A new method for enhancing the production of the negatively charged helium dimer He2−

J. Søgaard, Irene Hazell, Nis Bjerre, T. Andersen

Published Aug 1, 1995• 1 citation
Publisher
DOI
10.1016/0009-2614(95)00669-u

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Abstract : It is pointed out that bulk quantities of spin-polarized Triplet He* (2 Superscript 3 subscript 1) and Triplet He2* He2(a Superscript 3 sigma subscript u (+) should form insulating classical solids, respectively denoted as He IV-A and He IV-M. Estimates of some basic physical properties of He IV-A are given. A metallic phase of He IV-A is considered and modeled by a two-component Fermi fluid of spin-polarized He(+), ions and electrons. This metallic phase is predicted to occur at r subscript s approx. 2.3 and to lie considerably lower in energy than insulating He IV-A(M), making it the preferred phase to be looked for experimentally. A number of deexcitation mechanisms of atomic, dimerized, and bulk He* are identified, and the open problem of stability is discussed. A method is proposed to produce He IV-M, and ultimately metallic He IV-A, by optically pumping the He2* species produced by electron bombardment of superfluid helium. (Author)