THE ORTHO-TO-PARA CONVERSION IN SOLID HYDROGEN, CATALYZED BY HYDROGEN-ATOMS



: SHEVTSOV V, FROLOV A, LUKASHEVICH I, YLINEN E, MALMI P, PUNKKINEN M

Publisher: PLENUM PUBL CORP

: 1994

Journal of Low Temperature Physics

JOURNAL OF LOW TEMPERATURE PHYSICS

: J LOW TEMP PHYS

: 95

: 5-6

: 815

: 833

: 19

: 0022-2291

DOI: https://doi.org/10.1007/BF00754716


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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