A1 Refereed original research article in a scientific journal
THE ORTHO-TO-PARA CONVERSION IN SOLID HYDROGEN, CATALYZED BY HYDROGEN-ATOMS
Authors: SHEVTSOV V, FROLOV A, LUKASHEVICH I, YLINEN E, MALMI P, PUNKKINEN M
Publisher: PLENUM PUBL CORP
Publication year: 1994
Journal:: Journal of Low Temperature Physics
Journal name in source: JOURNAL OF LOW TEMPERATURE PHYSICS
Journal acronym: J LOW TEMP PHYS
Volume: 95
Issue: 5-6
First page : 815
Last page: 833
Number of pages: 19
ISSN: 0022-2291
DOI: https://doi.org/10.1007/BF00754716
Abstract
The combined techniques of ESR and NMR were used to investigate the process of ortho-para conversion in solid molecular hydrogen, containing small amounts (approximately 500 ppm) of hydrogen atoms as impurity. Although the impurity, atoms catalyze the effective conversion of the neighboring ortho-H-2, the total catalyzed conversion rate at temperatures from 2.2 K to 4.4 K is much less than expected from the rate of the H atoms recombination. A possible explanation is given in terms of the diffusion of H atoms, which is confined to some defects in the crystal.
The combined techniques of ESR and NMR were used to investigate the process of ortho-para conversion in solid molecular hydrogen, containing small amounts (approximately 500 ppm) of hydrogen atoms as impurity. Although the impurity, atoms catalyze the effective conversion of the neighboring ortho-H-2, the total catalyzed conversion rate at temperatures from 2.2 K to 4.4 K is much less than expected from the rate of the H atoms recombination. A possible explanation is given in terms of the diffusion of H atoms, which is confined to some defects in the crystal.
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