Solid rare gases and simple cryogenic molecular solids

1 Solid rare gases and simple cryogenic molecular solids 

The optical absorptiori spectra of solid rare gases exhibit characteristic sharp lines before the absorption edge. These lines are interpreted as being due to Wannier-type excitons. In this model, the energy levels of the excited electrons in the field of the positive hole are considered as being similar to those of the hydrogen atom. Since the electron and the hole have comparable masses, the reduced mass, is introduced as 

Springer Tracts in Modern Physics, Springer-Verlag, 

The polarization energies of positive holes in rare gas crystals have been calculated by Lyons and Sceat (1970). The location of the positive hole in the lattice is assumed to coincide with the position of an atom. The main contributions to the polarization energy are the ion-induced dipole interaction, Eid/ and the interaction between two ion-induced dipoles, P d. With gas phase polarizabilities, the values compiled in Table 3 were obtained. 

Data from Lyons, L.E. and Sceats, M.G., Ghent. Phys. Lett., 

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