Abstract
The observed polarization of single-rotational-level fluorescence in diatomic molecules results from the time evolution of the state multipoles set up in excited molecular arrays. Hyperfine coupling affects the observed polarization and we present a theory which treats this phenomenon for two differing cases, those of Li2* and I2*. In the former case hyperfine coherences are important and the theory encompasses this effect. The effects of elastic and rotationally inclastic collisions are considered and cross-sections for destruction of orientation are evaluated. Results on rotationally inelastic transfer are used to evaluate current atom-diatomic molecule scattering theories.
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