Low Temperature Physics: 45, 663 (2019); https://doi.org/10.1063/1.5103260
Fizika Nizkikh Temperatur: Volume 45, Number 6 (June 2019), p. 774-788    ( to contents , go back )

Trapping mechanism and sites of H and D atoms in solid Ne

Yu.A. Dmitriev

Ioffe Institute, 26 Politekhnicheskaya Str., St. Petersburg 194021, Russia
E-mail: dmitrievyurij@gmail.com

N.P. Benetis

Department of Environmental Engineering and Antipollution Control, Technological Educational Institute of Western Macedonia (TEI), Kila 50 100 Kozani, Greece
pos Анотація:

Received January 17, 2019, published online April 26, 2019

Abstract

The shifts of the isotropic Fermi contact hyperfine interactions (FCHFI) of hydrogen or deuterium atoms isolated in crystalline noble gases at cryogenic temperatures are compared to the values of the same quantities of the hydrogen atom in the gas phase. New experimental FCHFI values of H/D trapped in crystalline Ne are compared with experimentally obtained and theoretically computed values. The possible trapping sites in the distorted solid Ne gas crystalline structure occupied by the hydrogen atomic impurities are identified by the variation of the FCHFI shifts in the EPR spectra and discussed after their dependence to the deposition method. The present EPR investigation revealed formation of H2 microcrystals in solid Ne even at a very low H2 impurity content of 0.01% in the deposited H2:Ne gaseous mixture.

Key words: EPR spectra, hydrogen, deuterium, solid Ne.

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