Abstract
The i.r. spectrum of crystalline nitrous oxide has been reinvestigated. The longitudinal—transverse mode splitting of the three fundamentals has been determined and the factor group splitting of ν 2 has been observed. A large number of internal isotopic and combination bands have been assigned. In the region of combination bands extended two-phonon absorption bands have been observed which are particularly prominent in the region of ν 1 + ν 3 and ν 2 + ν 3. The energy of one- and two-phonon states has been calculated using a resonant dipole—dipole interaction potential. The results of calculation agree well with experiment. The intensity and profile of the two-phonon bands has been calculated using a mechanism of induced dipoles. It is shown that two-phonon bands arise by direct excitation via non-linear terms in the dipole operator.
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