Phonon spectroscopy of photochemical reactions in organic solids: Photodimerization of 2,6-dimethyl-p-benzoquinone

The Raman phonon spectroscopic study shows that the photodimerization of 2,6-dimethyl-p-benzoquinone. In the solid state is initially a homogeneous reaction but later becomes heterogeneous as the product accumulates. The Ion-temperature electronic absorption spectrum reveals that the reaction is phonon assisted by a polaron formed due to a strong electron- phonon coupling in the cxcited ¹nπ^* state.     

A new diabatic molecular representation in He+-he charge transfer collision

A “frozen-orbital” diabatic basis has been constructed to study the He⁺-He resonant charge transfer collision in a closecoupled impact parameter treatment. The Σ—Π rotational couplings are reasonably free from the incorrect asymptotic behaviour (α R^?1) Comparison with experiment at large scattering angles demonstrates significant improvement over earlier work.