Coupled states study of nonreactive F(2P)+H2(1Σ+g) collisions

The coupled states approximation is extended to treat combined fine structure and rotational state transitions in 2P atom–1Sg+ diatom scattering. CS calculations of opacities and degeneracy averaged integral cross sections for F(2P)+H2(1Sg+) nonreactive collisions agree well with the CC results of Lester and Rebentrost. The present, nonunitarized form of the CS approximation leads to a selection rule which forbids j′1 j′2 j12m12→j1 j2 j12-m12 transitions when j12 = half-odd integer values. This selection rule is not present in an exact treatment.