1. ESR investigation of hydrogen and deuterium atoms in impurity-helium solids
- Author
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S. I. Kiselev, David M. Lee, V. V. Khmelenko, and E. P. Bernard
- Subjects
3-й Международный семинар по физике низких температур в условиях микрогравитации ,Condensed Matter::Quantum Gases ,Materials science ,Physics and Astronomy (miscellaneous) ,Hydrogen ,Atoms in molecules ,General Physics and Astronomy ,chemistry.chemical_element ,law.invention ,chemistry ,Deuterium ,law ,Atom ,Molecule ,Physics::Atomic Physics ,Atomic physics ,Electron paramagnetic resonance ,Hyperfine structure ,Helium - Abstract
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.
- Published
- 2003