Abstract
Abstract The ESR linewidths of H(D) atoms, produced in γ-irradiated solid hydrogen, depend significantly upon the matrices of the hydrogen isotopes. The ESR linewidth has been calculated by considering the dipole interactions of the electron spin magnetic moments of a trapped hydrogen atom with the nuclear magnetic moments of the surrounding hydrogen nuclei in addition to the Fermi interactions. It is concluded from a comparison of the experimental ESR linewidths with the theoretical ones that the H atoms in solid H2 are trapped at substitutional sites, while the H(D) atoms in solid HD and D2 are trapped at interstitial octahedral sites.
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