By Vladimir G. Bordo
This e-book covers linear and nonlinear optics in addition to optical spectroscopy at strong surfaces and at interfaces among a pretty good and a liquid or gasoline. The authors provide a concise creation to the physics of surfaces and interfaces. They speak about intimately actual homes of good surfaces and in their interfaces to drinks and gases and supply the theoretical history for figuring out a number of optical ideas. the key a part of the booklet is devoted to a extensive evaluation on optical concepts and topical purposes equivalent to infrared and optical spectroscopy or optical microscopy. Discussions of nonlinear optics, but additionally nano-optics and native spectroscopy supplement this self-contained paintings. precious gains comprise approximately 50 issues of options, a thesaurus and a completely elaborated checklist of topical references. The booklet is desirable as a textual content for graduate scholars but additionally for scientists operating in physics, chemistry, fabrics or lifestyles sciences who search for knowledgeable creation to floor optical points in their experiences.
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Additional info for Optics and Spectroscopy at Surfaces and Interfaces
110) k with E0 the energy of the nonbonding state, LU MO and HOMO the energies of the LUMO and HOMO states, ULk and UHk the interaction matrix elements between the substrate electron state ψk and the LUMO and HOMO states, respectively. 113) k and w HOMO( ) = k one can rewrite Eq. 110) in the form: E − E0 = 2 F −∞ d w LU MO ( ) +2 − LU MO 0 F d where the factor 2 takes into account the spin of the electrons. Both integrals on the right-hand side of Eq. 113) are negative and thus both contribute to the stabilization of the chemisorption state.
17). The new point-group symmetry is C2v and there are again two stretching vibrations corresponding to two A1 representations. However, the degeneracy of the other modes is lifted, resulting in two vibrations in the plane of the bridge (ν3 and ν4 ) and two perpendicular to it (ν5 and ν6 ). 35 36 2 Surfaces and Interfaces Fig. 18 The simplest model for the calculation of the vibrational frequency of an adsorbed diatomic molecule. The surface is replaced by a single atom C connected with the molecule AB by an elastic force with force constant k.
Qualitatively, in addition to the attractive forces discussed above, if an atom approaches the surface, its electron shell undergoes repulsion due to both Coulomb and exchange interactions with the substrate electrons. At some intermediate distance the atom– surface potential (adsorption potential) thus has a minimum. The interaction force varies along the surface following its atomic structure and hence the adsorption potential depends not only on the z-coordinate but also on the lateral position of an atom, r .
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