Spectroscopy of Defects in Organic Crystals

1 Theory of Local Excitons.- 1.1 Basic Concepts of the Exciton Theory.- 1.2 Isotopic Impurity Spectrum.- 1.3 Local Excitons (X-Traps).- 1.4 Calculations of the Green Functions.- 1.5 Light Absorption by Local Excitons.- 1.6 Models of Local Exciton Centers (X-Traps).- 1.7 Vibronic Spectra of Local Excitons.- 2 Optical Spectra and Models of Local Excitons.- 2.1 Spectra of Local Excitons in Naphthalene and Deuteronaphthalene Crystals.- 2.2 Spectra of Local Excitons in Benzene.- 2.3 Experimental Data Analyses Model of Local Center.- 2.4 Configurational Mixing Effects for Local Excitons in Naphthalene Crystals.- 2.5 Optical Spectra of Naphthalene in the Region of Vibronic Transitions.- 2.6 Vibronic Spectra with Non-Totally Symmetric Vibrations in Naphthalene Doped with Heterocyclic Impurities.- 2.7 Vibronic Spectra with Totally Symmetric Vibrations.- 2.8 Local Excitons and Charge Transfer States.- 2.9 Influence of Concentration Effects on Local Exciton Spectra.- 2.10 Defects and Exciton-Band States.- 2.11 Local States in Crystals with Wide Exciton Bands.- 2.12 Triplet Local Excitons.- 2.13 Electron-Phonon Interaction in Local Centers.- 2.14 Creation of Local Centers by Irradiation.- 2.15 Appendix.- 3 Optical Spectra of Strained Organic Crystals.- 3.1 Deformation of Crystals under Stress.- 3.2 Exciton Hamiltonian of Strained Crystals.- 3.3 Optical Spectra under Hydrostatic Pressure.- 3.4 Exciton Spectra under Uniaxial Stress.- 3.5 Impurity Levels under Uniaxial Stress.- 3.6 Vibronic Levels in Strained Crystals.- 3.7 Excitations in Strained Naphthalene.- 3.8 Observation of Uniaxial-Stress Effects.- 3.9 Exciton Deformation Potential.- 3.10 Prospects of Uniaxial-Stress-Effect Investigations.- 4 Dislocations and Optical Properties of Organic Crystals.- 4.1 Observation of Dislocations in Luminescence Spectra.- 42 Dislocational Excitons in Strongly Anisotropic Crystals.- 43 Light Absorption by Dislocational Excitons.- 44 Light Scattering by Dislocations in the Region of Exciton Absorption.- 45 Excitation Energy Migration in Crystals with Dislocations and Local Centers.- 5 Surface Excitons.- 5.1 Quasiparticles in a Finite Crystal.- 5.2 Energy Spectrum of Surface Excitons.- 5.3 Quantization of Excited States of a Finite Crystal in Presence of the Electromagnetic Field.- 5.4 Electrodynamics of Surface Excitons.- 5.5 Light Reflection from Crystals with Narrow Bands.- 5.6 Observations of Surface Excitons in Reflection Spectra.- 5.7 Luminescence of Surface Excitons.- 5.8 Surface States in Vibronic Spectra.- 5.9 Excitation of Surface Excitons by Electron Beams.- 6 Thermoluminescence Spectroscopy of Defects.- 6.1 Trap Spectroscopy by Glow Technique.- 6.2 Dipole Traps for Charge Carriers.- 6.3 Dipole-Trap Clusters in Anthracene.- 6.4 Hydronaphthile Radicals — Deep Traps in Pure Naphthalene.- 6.5 Tautomers in Crystals of Nucleic Acid Bases.- 6.6 Temperature and Exciton Density Auto-Oscillations in Crystals under the Light Excitation.- References.- Author index.