Abstract
The infrared absorption coefficient in the ordered solid orthohydrogen is calculated by making use of our anharmonic theory for libron (J=l excitation) and roton (J=3 excitation). The momentum dependence of the transition amplitudes has properly been taken into account in conformity with our formalism. The shape of vibrational bands induding ] = 1, 3 rotational excitations is figured out in good agreement with the experiment by Boggs, Clouter and Welsh. A similar study has also been done for the infrared absorption spectra associated with para· hydrogen molecules diluted in the ordered orthohydrogen solid, where the spectral shape to be assigned to ] = 0-> 2 transition is proved to come from the vibron band in agreement with experiment.
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