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Translations and Rotational Vibrations of Molecules in
Classification of lattice vibrations according to irreducible representa
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A. F. Prikhotko absorption bands absorption spectrum anthracene atoms axis benzene benzene molecule biphenyl molecule calculated center of symmetry Chapter coefficients combinational scattering Raman coordinates corresponding crystalline cules Davydov depend determined dipole Eksptl electric vector electronic transition energy to lattice equilibrium positions excited molecule Forbidden Forbidden free excitons group velocity infrared infrared spectrum interaction forces intramolecular vibrations investigating irreducible representations isolated molecule lattice vibrational energy light absorption light wave localized low temperatures luminescence magnitude matrix element mole molecular crystals molecular excitation energy molecular vibrations molecules per unit monocrystal naphthalene Nauk Nuclei operation optical phenanthrene phenyl groups phonons Phys plane pleochroism polarization probability quantum mechanics region resonance interaction rotational scattering Raman scattering solid solution spectra symmetry group system of equations Table Teoret theory tion transformation unit cell values vapor velocity vibrational frequencies wave functions wave number wave vector zeroth approximation Zhur zones