Nuclear Magnetic Relaxation in Solid Hydrogens with Dilute Ortho-H_2

概要

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Concentration dependences of the nuclear longitudinal and transverse relaxation times T_l and T_2 are theoretically studied for solid H_2 With dilute ortho-H_2, by extending the previous treatment by Hama et al. The effect of crystalline field energies is taken into account by confining EQQ Hamiltonian to its secular part in crystalline field frequency. The results for T_l are shown to be in good agreement with experiments at ortho concentrations down to 3×10^<-3>. The results for T_2 are presented for the two limiting cases of low and high rotational Zeeman frequencies where the high frequency limit is relevant to the case of very low concentrations, in agreement with experiments. The continuum approximation used throughout the present study is shown to break down at concentrations lower than frequency-dependent critical values, being in accord with the concentration at which theoretical deviations from experiments begin to occur for T_l at 30 MHz.
理論物理学刊行会の論文
1975-08-25