INTERACTION OF TRAPPED H(D) ATOMS WITH Xe MATRIX INFLUENCED BY ZERO-POINT VIBRATIONS OF THE LIGHT ATOMS

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1994

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Ohio State University

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Hydrogen and deuterium atoms are stabilized in xenon matrix from the gas phase and investigated by $ESR^{1}$. It is shown that being deposited from the gas discharge in a mixture of $H_{2}$ and Da with xenon, H and D atoms are trapped in the substitutional position of the matrix crystal lattice. ESR linewidths of H and D show an isotope effect, that is $(\Delta H)^{H}/(\Delta H)^{D} = 1.10(4)$, where $(\Delta H)^{H}$ and $(\Delta H)^{D}$ are the peak-to-peak linewidths for H and D atoms, respectively. The shape of the ESR lines observed is close to Gaussian. The linewidths are found to be greatly increased by the zero-point vibrations of the atoms, the dynamical broadening being nearly equal to the static one. We show that substitutional H and D atoms trapped in solid xenon perform measurably anharmonic vibrations, and the spherically symmetric potential well which is to model the actual one for the substitutional hydrogen atom has a rather flat bottom. The coefficient $\nu (r) = \gamma exp (-\eta r)$ (where $\gamma$ and $\eta$ are constants) of the transfer of the electronic charge from Xe atom to H atom in Xe-H ``molecule” is estimated using the experimental data, r being the interatomic distance, $\gamma = 25.71, \eta - 1.25$, in atomic units. A comparison is carried out between experimental and theoretical values for the relative matrix shirt of the trapped H atom hyperfine (hr) structure constant, and it is found that experimental and theoretical quantities are in satisfactory agreement: $(\Delta A /Af)exp. = -1.05% , (\Delta A / Af)$theof. == -0.98% where $\Delta = A - $Ar, and Ar is the hf constant of the free atom.

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1. Yu. A. Dmitriev. J. Phys.: Condens. Matter 5, 5245(1993).
Author Institution: A.F. Ioffe Physico-Technical Institute

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