Hund's cases for rotating diatomic molecules and for atomic collisions: angular momentum coupling schemes and orbital alignment
Abstract
The classification of rotational spectra of diatomic molecules according to the five Hund's cases provides a guide to the quantum mechanical formulation of alternative coupling schemes for the treatment of collisions between atoms having nonzero internal — spin and/or electronic — angular momenta. This paper presents an account of the corresponding diabatic representations and of the orthogonal transformations among cases; closure properties are derived from a pentagonal cyclic arrangement of angular momentum recoupling transformations and a limiting relationship between re-coupling and coupling coefficients. Adiabatic representations are also discussed, with reference to the description of orbital alignment in atomic collisions. Extensions to inelastic molecular encounters and reactions are briefly outlined.
- Publication:
-
Zeitschrift fur Physik D Atoms Molecules Clusters
- Pub Date:
- September 1996
- DOI:
- 10.1007/BF01426406
- Bibcode:
- 1996ZPhyD..36..215A
- Keywords:
-
- 33.10.Cs;
- 34.50. —
- s