Spectroscopy Of Defects In Organic Crystals Book

1	Theory of Local Excitons	1
1.1	Basic Concepts of the Exciton Theory	1
1.2	Isotopic Impurity Spectrum	4
1.3	Local Excitons (X-Traps)	7
1.4	Calculations of the Green Functions	11
1.5	Light Absorption by Local Excitons	13
1.6	Models of Local Exciton Centers (X-Traps)	15
1.7	Vibronic Spectra of Local Excitons	18
2	Optical Spectra and Models of Local Excitons	23
2.1	Spectra of Focal Excitons in Naphthalene and Deuteronaphthalene Crystals	24
2.2	Spectra of Local Excitons in Benzene	29
2.3	Experimental Data Analyses. Model of Local Center	31
2.4	Configurational Mixing Effects for Local Excitons in Naphthalene	38
2.5	Optical Spectra of Naphthalene in the Region of Vibronic Transitions	46
2.6	Vibronic Spectra with Non-Totally Symmetric Vibrations in Naphthalene Doped with Heterocyclic Impurities	49
2.7	Vibronic Spectra with Totally Symmetric Vibrations	54
2.8	Local Excitons and Charge Transfer States	57
2.9	Influence of Concentration Effects on Local Exciton Spectra	63
2.10	Defects and Exciton-Band States	73
2.11	Local States in Crystals with Wide Exciton Bands	83
2.12	Triplet Local Excitons	84
2.13	Electron-Phonon Interaction in Local Centers	89
2.14	Creation of Local Centers by Irradiation	92
2.15	Appendix	94
3	Optical Spectra of Strained Organic Crystals	103
3.1	Deformation of Crystals under Stress	103
3.2	Exciton Hamiltonian of Strained Crystals	106
3.3	Optical Spectra under Hydrostatic Pressure	107
3.4	Exciton Spectra under Uniaxial Stress	112
3.5	Impurity Levels under Uniaxial Stress	114
3.6	Vibronic Levels in Strained Crystals	115
3.7	Excitations in Strained Naphthalene	117
3.8	Observation of Uniaxial-Stress Effects	118
3.9	Exciton Deformation Potential	125
3.10	Prospects of Uniaxial-Stress-Effect Investigations	130
4	Dislocations and Optical Properties of Organic Crystals	133
4.1	Observation of Dislocations in Luminescence Spectra	133
4.2	Dislocational Excitons in Strongly Anisotropic Crystals	140
4.3	Light Absorption by Dislocational Excitons	145
4.4	Light Scattering by Dislocations in the Region of Exciton Absorption	148
4.5	Excitation Energy Migration in Crystals with Dislocations and Local Centers	150
5	Surface Excitons	159
5.1	Quasiparticles in a Finite Crystal	159
5.2	Energy Spectrum of Surface Excitons	161
5.3	Quantization of Excited States of a Finite Crystal in Presence of the Electromagnetic Field	167
5.4	Electrodynamics of Surface Excitons	170
5.5	Light Reflection from Crystals with Narrow Bands	176
5.6	Observations of Surface Excitons in Reflection Spectra	178
5.7	Luminescence of Surface Excitons	184
5.8	Surface States in Vibronic Spectra	188
5.9	Excitation of Surface Excitons by Electron Beams	189
6	Thermoluminescence Spectroscopy of Defects	191
6.1	Trap Spectroscopy by Glow Technique	191
6.2	Dipole Traps for Charge Carriers	194
6.3	Dipole-Trap Clusters in Anthracene	197
6.4	Hydronaphthile Radicals - Deep Traps in Pure Naphthalene	204
6.5	Tautomers in Crystals of Nucleic Acid Bases	206
6.6	Temperature and Exciton Density Auto-Oscillations in Crystals under the Light Exciton	210
	References	215
	Subject index	235
	Author index	243