Spin transmission, temperature dependence

However, often the minimum in Si or Ti which is reached at first is shallow and thermal energy will allow escape into other areas on the Si or Ti surface before return to So occurs (Fig. 3, path e). This is particularly true in the Ti state which has longer lifetimes due to the spin-forbidden nature of both its radiative and non-radiative modes of return to So-The rate of the escape should depend on temperature and is determined in the simplest case by the height and shape of the wall around the minimum, similarly as in ground state reactions (concepts such as activation energy and entropy should be applicable). In cases of intermediate complexity, non-unity transmission coefficients may become important, as discussed above. Finally, in unfavorable cases, vibronic coupling between two or more states has to be considered at all times and simple concepts familiar from ground-state chemistry are not applicable. Pres-... 

Palatnik et al. (1971, 1975), Tu et al. (1972), Ahn and Shafer (1971), Ikesawa and Suzuki (1973), Mitani et al. (1975) and Mayr et al. (1979) have studied the dependence of the absorption spectra on the nature and the temperature of the substrate, the impurities and the lattice effects. Ahn and Shafer (1971) have shown that with increasing incorporation of iron in a EuS film, the optical absorption increases. From optical transmission and reflection spectrometry data and the first experiment on light scattering from acoustic spin waves, Mayr et al. (1979) have shown that it is possible to determine stoichiometric variations, lattice defects, oxide formation and magnetic homogeneity. 

---