| Theory of Local Excitons | p. 1 |
| Basic Concepts of the Exciton Theory | p. 1 |
| Isotopic Impurity Spectrum | p. 4 |
| Local Excitons (X-Traps) | p. 7 |
| Calculations of the Green Functions | p. 11 |
| Light Absorption by Local Excitons | p. 13 |
| Models of Local Exciton Centers (X-Traps) | p. 15 |
| Vibronic Spectra of Local Excitons | p. 18 |
| Optical Spectra and Models of Local Excitons | p. 23 |
| Spectra of Focal Excitons in Naphthalene and Deuteronaphthalene Crystals | p. 24 |
| Spectra of Local Excitons in Benzene | p. 29 |
| Experimental Data Analyses. Model of Local Center | p. 31 |
| Configurational Mixing Effects for Local Excitons in Naphthalene | p. 38 |
| Optical Spectra of Naphthalene in the Region of Vibronic Transitions | p. 46 |
| Vibronic Spectra with Non-Totally Symmetric Vibrations in Naphthalene Doped with Heterocyclic Impurities | p. 49 |
| Vibronic Spectra with Totally Symmetric Vibrations | p. 54 |
| Local Excitons and Charge Transfer States | p. 57 |
| Influence of Concentration Effects on Local Exciton Spectra | p. 63 |
| Defects and Exciton-Band States | p. 73 |
| Local States in Crystals with Wide Exciton Bands | p. 83 |
| Triplet Local Excitons | p. 84 |
| Electron-Phonon Interaction in Local Centers | p. 89 |
| Creation of Local Centers by Irradiation | p. 92 |
| Appendix | p. 94 |
| Optical Spectra of Strained Organic Crystals | p. 103 |
| Deformation of Crystals under Stress | p. 103 |
| Exciton Hamiltonian of Strained Crystals | p. 106 |
| Optical Spectra under Hydrostatic Pressure | p. 107 |
| Exciton Spectra under Uniaxial Stress | p. 112 |
| Impurity Levels under Uniaxial Stress | p. 114 |
| Vibronic Levels in Strained Crystals | p. 115 |
| Excitations in Strained Naphthalene | p. 117 |
| Observation of Uniaxial-Stress Effects | p. 118 |
| Exciton Deformation Potential | p. 125 |
| Prospects of Uniaxial-Stress-Effect Investigations | p. 130 |
| Dislocations and Optical Properties of Organic Crystals | p. 133 |
| Observation of Dislocations in Luminescence Spectra | p. 133 |
| Dislocational Excitons in Strongly Anisotropic Crystals | p. 140 |
| Light Absorption by Dislocational Excitons | p. 145 |
| Light Scattering by Dislocations in the Region of Exciton Absorption | p. 148 |
| Excitation Energy Migration in Crystals with Dislocations and Local Centers | p. 150 |
| Surface Excitons | p. 159 |
| Quasiparticles in a Finite Crystal | p. 159 |
| Energy Spectrum of Surface Excitons | p. 161 |
| Quantization of Excited States of a Finite Crystal in Presence of the Electromagnetic Field | p. 167 |
| Electrodynamics of Surface Excitons | p. 170 |
| Light Reflection from Crystals with Narrow Bands | p. 176 |
| Observations of Surface Excitons in Reflection Spectra | p. 178 |
| Luminescence of Surface Excitons | p. 184 |
| Surface States in Vibronic Spectra | p. 188 |
| Excitation of Surface Excitons by Electron Beams | p. 189 |
| Thermoluminescence Spectroscopy of Defects | p. 191 |
| Trap Spectroscopy by Glow Technique | p. 191 |
| Dipole Traps for Charge Carriers | p. 194 |
| Dipole-Trap Clusters in Anthracene | p. 197 |
| Hydronaphthile Radicals - Deep Traps in Pure Naphthalene | p. 204 |
| Tautomers in Crystals of Nucleic Acid Bases | p. 206 |
| Temperature and Exciton Density Auto-Oscillations in Crystals under the Light Exciton | p. 210 |
| References | p. 215 |
| Subject index | p. 235 |
| Author index | p. 243 |
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