Spectroscopy and Dynamics of Orientationally Structured Adsorbates, Vol. 3 Book

	Preface
1	Introduction	1
2	Orientational structures of adsorbates	6
2.1	Brief survey of experimental data and theoretical approaches	6
2.2	Orientational ordering in two-dimensional dipole systems	13
2.3	Lateral interactions of nonpolar molecules and expressing them in a quasi-dipole form	26
2.4	Ground states and phase transitions for a system of nonpolar molecules on a square lattice	39
2.5	Orientational phase transitions in planar systems of nonpolar molecules	45
3	Dispersion laws for collective excitations on complex planar lattices	52
3.1	Complex orientational structures and corresponding Davydov-split spectral lines	52
3.2	Lattice-sublattice relations and its application to orientational structures on square and honeycomb lattices	59
3.3	Chain orientational structures on planar lattices	67
4	Temperature dependences of spectral line shifts and widths	78
4.1	Resonant nature of low-frequency collective excitations of molecules on surfaces	80
4.2	Markov approximation for Green's functions of molecular subsystems in the condensed phase	86
4.3	Generalization of the exchange dephasing model to various cases of anharmonic coupling between high-frequency and low-frequency modes, and to the case of collectivized excitations in adsorbate	105
App. 1	Local and resonance states for a system of bound harmonic oscillators	127
App. 2	Thermally activated reorientations and tunnel relaxation of orientational states in a phonon field	159
App. 3	The spectral function of local vibration (low-temperature approximation involving collectivized high-frequency and low-frequency modes)	175
	Bibliography	183
	Subject index	192
	Author index	196