Rotational Excitations in J = 0 Solids
The most characteristic property of the solid hydrogens is that the anisotropic intermolecular interaction does not appreciably mix states corresponding to different values of the total rotational quantum number J = Σ i J i , which therefore remains a good quantum number in the solid, at least at low pressures. The main effect of the interaction between the molecules is to lift the degeneracy of the excited rotational levels and to broaden them into rotational energy bands. The states in these bands are characterized by a wave vector and a polarization index, and correspond to hopping rotational excitations, the rotons.1 In solid H2 and D2 these rotons are quasiparticles with spin 2, 4,..., whereas in solid HD rotons with even and odd spin can occur. The frequency of the J = 0 → J = 1 transition in HD is less than the Debye frequency in that solid even at zero pressure, and the J = 1 rotons in HD are therefore hybridized with the phonons.2 In solid H2 and D2 the J = 2 rotons hybridize with the phonons only at very high pressures,3 but at lower pressures the Debye frequency is small compared to the rotational excitation energy and the phonons and rotons are essentially independent in these solids.
KeywordsDipole Moment Rotational State Induce Dipole Moment Solid Hydrogen Rotational Excitation
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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