Abstract
The J=2 rotons in solid para-H2 are J = 2 rotational excitations of the molecules traveling through the crystal as a result of the anisotropic intermolecular coupling which is dominated by the electric quadrupole-quadrupole (EQQ) interaction.1 In the hcp crystal structure three J = 2 rotons at the center of the Brillouin zone (k≈0) are Raman-active and give rise to a triplet of narrow lines at ΔEpara = 6B = 355 cm−1 (B; rotational constant of H2), split by only 2 cm−1 by the EQQ interaction.
© 1988 Optical Society of America
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