Abstract
Decay mechanism of H -2 anions in X(γ)-irradiated solid para-H2 (p-H 2 ) has been studied using high-resolution ESR spectroscopy in the temperature range between 1.3–6.6 K. The results are summarized as follows. First,the decay rate constant of the -2 anions is not proportional to initial yields of reactive species such as cations and H atoms but proportional to the concentration of less-reactive species of HD molecules in p-H2 . This result shows that the decay of the -2 anion is due to the reaction neither with cations nor H atoms but with HD molecules originally contained in the p-H2 sample at natural abundance. Second,the decay rate constant of the -2 anions increases proportionally with the increase in temperature below 3 K and decreases with the increase in temperature between 3–5 K,although it increases exponentially with the increase in temperature above 5 K. This result indicates that the decay rate constant of the -2 anions is controlled by the rate constant for the diffusion of the -2 anions via one-phonon assisted quantum tunneling below 3 K,two-phonon scattered or assisted quantum tunneling between 3–5 K,and thermally-activated process above 5 K.
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Kumada, T., Kitagawa, N., Mori, S. et al. Decay of -2 Anions in Solid Parahydrogen via Two-Stage Quantum Tunneling Diffusion Processes. Journal of Low Temperature Physics 114, 413–429 (1999). https://doi.org/10.1023/A:1021850103903
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DOI: https://doi.org/10.1023/A:1021850103903