부산대학교 도서관

The pure rotational U transitions and the accompanying phonon U/sub R/ branches of solid hydrogen and its isotopes have been obtained for the first time using a Fourier transform spectrometer. A new method to determine the one phonon density of states of solid hydrogen from these spectra has been developed. A theoretical relation between the one phonon density of state and the phonon branch profile has been derived for the first time. The U/sub R/ phonon branch alone (unlike the Q/sub R/ and S/sub R/ branches) is found to have simple and reversible relation with the one phonon spectrum. The pure rotational U transition is thus shown to play a unique role in determination of the one phonon density of states of solid hydrogen. The ''in band resonance'' due to D/sub 2/ mass defects in H/sub 2/ has been observed and characterized.