Excitation transfer interactions, potentials

Thus, it is concluded that the de-excitation of the metastable Ar( P2 and Pq) atoms is ascribed to the nonadiabatic excitation transfer at large intermolecular distance by the crossing of the intermolecular potential curves between the initial Ar -M channel and the final Ar-M channel, and the de-excitation of the resonant Ar( Pi and Pi) to the resonant excitation transfer by the dipole-dipole interaction [153]. This conclusion is compatible with the result of the above-mentioned conclusions for the de-excitation of He(2 P) by Ne [135]. 

The interactions between metastable noble-gas atoms and ground-state noble-gas atoms are relatively simple and have been investigated quite extensively. If the excitation energy is lower than the ionization potential of the collision partner, the only important inelastic process is the transfer of excitation energy.12 The excitation transfer is usually very efficient when the process is near resonant. The process that is responsible for the operation of the He-Ne laser,13... 

Intramolecular proton transfer in electronically excited transfer in, say, salicylic acid ester and other aromatic compounds leads to deexcitation of the energized electron [43-45]. In photoreduction processes, electron transfer often precedes proton transfer [46] the stability of the protonic bond is at least partially due to an n-a interaction [47]. The strength of the protonic interaction appears to be proportional to the ionization potential of the donor and is sensitive to solvent polarity [48]. These effects have hardly been touched on in biologically important transitions and represent an important new field of research. 

First, vibrational relaxation takes place also in low density gases. Collisions involving the vibrationally excited molecule may result in transfer of the excess vibrational energy to rotational and translational degrees of freedom of the overall system. Analysis based on collision theory, with the intermolecular interaction potential as input, then leads to the cross-section for inelastic collisions in which... 

In most heterocomplexes the two constituents differ in their ionization potentials and electron affinities. This can promote a partial charge transfer upon contact of the two molecules causing a considerable electric dipole to form across the interface. The importance of the charge-transfer interactions can therefore become dominant over the excitation exchange interactions. Indeed, most exciplexes appear to be stabilized mainly by charge-transfer interactions [24],... 

---