Radiospectroscopy of organic semiconductors
I. Introduction 237 II. Electron Paramagnetic Resonance in Organic Semiconductors 238 1. EPR Observation of Triplet States of Organic Crystals 238 2. Triplet Excitons in Charge-transfer Complexes and Other Organic Semiconductors 240 3. Activation Energy of Singlet-triplet Transitions and Width of the Forbidden Band 245 III. Nuclear Quadrupole and Nuclear Magnetic Resonance of Organic Semiconductors 247 1. Study of the Nature of Chemical Bonds in Charge-transfer Complexes 247 2. Temperature Dependence of Frequencies 249 3. Temperature Dependence of Relaxation Times 251 IV. Conclusion 252 Bibliography 253
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