ESR investigation of hydrogen and deuterium atoms in impurity-helium solids

Автор(и)

  • S.I. Kiselev Laboratory of Atomic and Solid State Physics Cornell University, Ithaca, NY 14853-2501, USA
  • V.V. Khmelenko Laboratory of Atomic and Solid State Physics Cornell University, Ithaca, NY 14853-2501, USA
  • E.P. Bernard Laboratory of Atomic and Solid State Physics Cornell University, Ithaca, NY 14853-2501, USA
  • D.M. Lee Laboratory of Atomic and Solid State Physics Cornell University, Ithaca, NY 14853-2501, USA

DOI:

https://doi.org/10.1063/1.1542539

Ключові слова:

PACS: 67.40.Yv, 67.40.Mj, 61.10.Eq, 61.46. w

Анотація

Impurity-helium solids (Im-He solids) are porous solids created by injecting a beam of mixed helium and impurity gases into superfluid 4He. In this work we use electron spin resonance (ESR) techniques to investigate Im-He solids containing atoms and molecules of hydrogen and/or deuterium. We have performed studies of low temperature (T ~ 1.35 K) tunnelling chemical reactions in which deuterium atoms replace the hydrogen atoms bound in H2 or HD molecules to produce large (up to 7.5×1017cm-3) and relatively stable concentrations of free hydrogen atoms. The time dependence of H and D atom concentrations has been investigated for Im-He samples with different initial ratios of hydrogen and deuterium ranging from 1:20 to 1:1.The satellite ESR lines associated with the dipolar coupling of electron spins of H and D atoms to the nuclear moments of the hydrogen nuclei found in neighboring molecules have been observed in Im-He solids. The forbidden hyperfine transition of atomic hydrogen involving the mutual spin flips of electrons and protons has also been observed.

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Опубліковано

2003-05-16

Як цитувати

(1)
Kiselev, S.; Khmelenko, V.; Bernard, E.; Lee, D. ESR Investigation of Hydrogen and Deuterium Atoms in Impurity-Helium Solids. Fiz. Nizk. Temp. 2003, 29, 678-683.

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