Abstract
The EPR spectra of CH3, CH2D, CHD2, and CD3 radicals in a H2 matrix have been observed in the temperature range 1.6–4.2 K. The radicals were obtained by condensation of two gas flows on a cold substrate: deuterium mixed with 2 mol % methane passed through a discharge and pure hydrogen bypassing the discharge. The CD3 and CHD2 spectra were found to be a superposition of two spectra: high- and low-temperature. A transformation of the shape of the CD3 and CHD2 spectra with decreasing sample temperature was observed. This was attributed to a change in the populations of the lowest rotational states of the radicals. Compared to the known results for deuterated methyl radicals in Ar, the present observations suggest the existence of a barrier hindering the rotation of radicals in solid H2.
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