Further Study on Trapping Sites of Hydrogen Atoms in Solid Hydrogen at 4.2 K Analyzed by the ESR Linewidths

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.