Author/Authors :
Kumada، نويسنده , , T and Kitagawa، نويسنده , , N and Noda، نويسنده , , T and Kumagai، نويسنده , , J and Aratono، نويسنده , , Y and Miyazaki، نويسنده , , T، نويسنده ,
Abstract :
An ENDOR spectrum of H atoms produced in the γ-ray irradiated solid H2 was measured at 4.2 K in order to elucidate the structure of the local environment of the H atoms in solid H2. We found that the H atoms were not trapped in interstitial sites but in substitutional sites of the solid, and almost all the ortho-H2 molecules at the first nearest sites from the H atoms converted into para-H2 molecules. This result shows that the ortho–para conversion is induced by electron spins of the H atoms.
