Symmetry in (H2)2, (D2)2, (HD)2, and H2–D2 Van der Waals complexes

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Abstract
The molecular symmetry group of the Van der Waals complex (H2)2 or (D2)2 is a group of order 16 called G16. This group is used to symmetry label the rotation–vibration states and the nuclear spin states of the complexes; the nuclear spin statistical weights are also determined. The group is used to classify the terms in the expansion of the dipole moment function and to determine the symmetry restrictions for allowed electric dipole transitions. The complex H2–D2 has a molecular symmetry group of order 8, G8, and (HD)2 a group of order 4, G4; the energy level symmetries, statistical weights, and selection rules for these complexes are also determined.

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