Infrared fundamental band of solid orthohydrogen in the ordered state
- 15 January 1970
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 48 (2) , 237-240
- https://doi.org/10.1139/p70-031
Abstract
The structure of the zero-phonon branches [Q, S(0), S(1)] of the infrared fundamental band of solid orthohydrogen (99% pure) has been measured for the ordered state at 1.05 °K. The Q branch consists of a weak Q1(1) line, due to perturbation of the lattice symmetry by para-H2 impurities, and a more intense sideband with maxima shifted from Q1(1) by 8.8, 10.6, and 15.3 cm−1; the latter are discussed in terms of recent theoretical results on travelling orientational excitations (librons) in the ground state (J = 1) of solid orthohydrogen. The S(0) absorption of the impurity para molecules exhibits a fine structure which is interpreted as crystalline field splitting of the J = 2 rotational state. Structure is also observed in the S(1) absorption which is associated with the vibron + roton combination transition, Q1(1) + S0(1).Keywords
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