摘要
A pure rotational U-type transition (J=4) in solid parahydrogen has been recorded by using a high sensitivity infrared spectrometer. On the assumption of a rigid lattice, the measured intensity led to a value of 0.335 (in atomic units) for the hexadecapole moment of molecular hydrogen. Electric quadrupole-quadrupole interaction effects have been identified in the spectra. It appears possible to extract the phonon density of states in solid H2 from the phonon branch U0R(J). © 1981 The American Physical Society.