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Kumada, Takayuki; Tachikawa, Hiroto*; Takayanagi, Toshiyuki*
Physical Chemistry Chemical Physics, 7(5), p.776 - 784, 2005/02
Times Cited Count:12 Percentile:38.35(Chemistry, Physical)The quartet ESR lines observed in X-ray irradiated solid parahydrogen, which have previously been assigned to H, are reinvestigated. We have reassigned the quartet lines to H rather than H. Based on the new assignment, previous data have been reinterpreted as follows. The H ion is composed of the collinearly aligned H core at the center and two H rotors at both ends. The ortho-para conversion of H core of H is completed within the time-scale of hours. H diffuses quantum mechanically by the repetition of H + H H + H reaction, and the diffusion terminates by the reaction with a HD impurity as H + HD HD + H. Finally, we will propose a possible reason why H is produced instead of H in the irradiated solid H.