| Introduction | p. 1 |
| Atom Tunneling Phenomena | p. 1 |
| Aim of the Book | p. 4 |
| Outline of the Book | p. 7 |
| References | p. 11 |
| Atom Tunneling in Physics | |
| Theory of Atom Tunneling Reactions in the Gas Phase | p. 15 |
| Introduction | p. 15 |
| What is Tunneling in Chemical Reactions? | p. 16 |
| Quantum Mechanical Methods for Calculating Rate Constants | p. 18 |
| Low Temperature Behavior of Rate Constants: Wigner Threshold Law | p. 20 |
| Effect of van der Waals Interactions on Tunneling Reactions | p. 21 |
| H + H2 Tunneling Reaction in Solid Phase: Application of Gas-Phase Models | p. 24 |
| Tunneling in the F + H2, D2, and HD Reactions | p. 26 |
| Conclusion and Future Development | p. 28 |
| References | p. 29 |
| Theory of Atom Tunneling Reactions in the Solid Phase | p. 33 |
| Introduction | p. 33 |
| Description of Low Temperature Chemical Reactions | p. 36 |
| Experimental Data on H-Atom Tunneling and Fitting by One Dimensional Model | p. 42 |
| Effect of Promotive Modes on the Rate Constant of Atom Tunneling | p. 43 |
| Relaxation Processes | p. 44 |
| Time of Tunneling Transition | p. 44 |
| Double Adiabatic Approximation | p. 45 |
| Modified Theory of Radiationless Transitions | p. 46 |
| Comparison of Theory with Experimental Data | p. 48 |
| Mechanisms of Temperature and Pressure Dependencies of the Rate Constant | p. 49 |
| Role of Medium Reorganization in D-Transfer in an Irradiated HD Crystal | p. 50 |
| H-atom Tunneling in the Fluorene-Acridine System | p. 52 |
| Conclusion and Future Development | p. 54 |
| References | p. 55 |
| Atom Tunneling Reactions in Quantum Solid Hydrogen | p. 59 |
| Introduction. Classical Reactions and Tunneling Reactions | p. 59 |
| Temperature Dependence | p. 60 |
| Isotope Effect | p. 62 |
| ESR Measurement at Very Low Temperature | p. 63 |
| Conclusive Evidence for Atom Tunneling Reactions | p. 64 |
| Temperature Independence | p. 65 |
| Large Isotope Effect | p. 66 |
| Comparison of Experimental Rate Constants with Theoretical Values | p. 68 |
| Controlling Factors of Classical Reactions | p. 70 |
| Controlling Factors of Tunneling Reactions | p. 70 |
| Effect of Deformation of Crystalline Structure | p. 70 |
| Anomalous Temperature Effect on the Decay of <$>{\rm H}_2^-<$> Anions | p. 74 |
| Effect of Disorder and Energy Dissipation | p. 77 |
| Inverse Secondary Isotope Effect of Methyl Radical Reactions | p. 85 |
| Fascinating Quantum Properties of Solid Hydrogen | p. 86 |
| Conclusion and Future Development | p. 87 |
| References | p. 88 |
| Atom Tunneling Phenomena in Quantum Solid and Liquid Helium | p. 91 |
| Introduction. Quantum Nature of Helium Atoms | p. 91 |
| Nuclear Magnetic Ordering of Solid 3He Arising from Tunneling of Atoms | p. 92 |
| Quantum Nucleation in Superfluid Helium by Tunneling | p. 98 |
| Tunneling Motion of Dislocation Lines in Solid 3He | p. 103 |
| Conclusion and Future Development | p. 108 |
| References | p. 109 |
| Quantum Tunneling Diffusion | p. 111 |
| Introduction | p. 111 |
| Quantum Tunneling Diffusion of Positive Muons and Muonium | p. 112 |
| Effect of Disorder and Superconductivity | p. 115 |
| Muonium in a Bloch State | p. 117 |
| Conclusion and Future Development | p. 123 |
| References | p. 123 |
| Atom Tunneling in Chemistry | |
| Fascinating Aspects of Tunneling Reactions in Organic Substances | p. 127 |
| Introduction | p. 127 |
| Selective Tunneling Reaction in Alkane Mixtures by H Atoms | p. 128 |
| Formation of H Atoms in Radiolysis of Alkane | p. 128 |
| Evidence for Tunneling Reaction | p. 131 |
| Selectivity in Tunneling Reaction | p. 132 |
| Local Motion and Selective Tunneling Reaction | p. 135 |
| Selective Tunneling Reaction in the Same Alkane by H Atoms | p. 138 |
| Instability of Molecules. Tunneling Elimination of H2 Molecule from Alkane Cation | p. 140 |
| Instability of Molecules. Tunneling cis-trans Isomerization of Formic Acid | p. 144 |
| Conclusion and Future Development | p. 145 |
| References | p. 145 |
| Tunneling Insertion Reaction of Carbenes | p. 147 |
| Introduction | p. 147 |
| Dicoordinate Carbon Intermediate-Carbenes | p. 147 |
| Carbenes Have Two-Electronic States Singlet and Triplet Multiplicities | p. 148 |
| Singlet and Triplet States Show Different Reaction Patterns | p. 149 |
| How to Generate a Carbene | p. 151 |
| Reactions of Arylcarbenes with Alkenes at 77 K | p. 152 |
| Reactions of Arylcarbenes with Alcohols at 77 K | p. 155 |
| Tunneling C-H Insertion from Triplet Carbenes at Low Temperature | p. 157 |
| Why Can Only Triplets Find a Tunneling Pathway? | p. 160 |
| Tunneling Reactions of Carbene Having Intramolecular Reaction Channels | p. 161 |
| Tunneling in Intramolecular Reactions | p. 164 |
| Tunneling Reaction at Elevated Temperatures | p. 166 |
| Conclusion and Future Development | p. 170 |
| References | p. 171 |
| Production of Interstellar Molecules and Amorphous Semiconductors by Atom Tunneling Reaction | p. 173 |
| Introduction | p. 173 |
| Method | p. 175 |
| Laboratory Simulation of H-atom Tunneling Reactions in Interstellar Ices | p. 177 |
| Gas-Grain Processes for the Formation of NH3, CH4, and H2O | p. 178 |
| Formation of Formaldehyde by the Tunneling Reaction of H with Solid CO at 10 K | p. 182 |
| Tunneling Reactions of H Atoms with Solid C2H2, C2H4, and C2H6 | p. 184 |
| Tunneling Reactions of D Atoms with C2H2, C2H4 and C2H6: Isotope Effect | p. 189 |
| Negative Temperature Dependence of H-Atom Tunneling Reactions | p. 190 |
| Formation of Amorphous Semiconductor by H-Atom Tunneling Reactions | p. 193 |
| Conclusion and Future Development | p. 197 |
| References | p. 198 |
| Atom Tunneling and Molecular Structure | p. 201 |
| Introduction | p. 201 |
| Experimental Methods | p. 201 |
| Proton Tunneling in Molecules and Complexes | p. 206 |
| Proton Tunneling in Molecules | p. 206 |
| Proton Tunneling in Complexes | p. 219 |
| Conclusion and Future Development | p. 227 |
| References | p. 228 |
| Atom Tunneling in Biology | |
| Atom Tunneling and Crystalline Structure | p. 233 |
| Introduction | p. 233 |
| General Considerations on X-Ray and Neutron Diffraction, Crystal Structure and Phase Transitions | p. 234 |
| Proton Tunneling in Hydrogen-Bonded Crystals | p. 237 |
| Tunneling Energy Levels of Ammonium Ions in Ammonium Hexachlorometallates: Global and Local Rotation and Tunneling | p. 245 |
| Delocalization of H (D) Atoms. Structure of (NH4)2PtCl6, (NH4)2SnCl6 and (ND4)2SnCl6 by Neutron Diffraction | p. 251 |
| Other Compounds Possessing Strong Isotope-Dependent Properties | p. 257 |
| Conclusion and Future Development | p. 258 |
| References | p. 258 |
| Atom Tunneling in Biology | |
| Atom Tunneling Reaction of Vitamin C in Suppression of Mutation | p. 263 |
| Introduction | p. 263 |
| Tunneling Reaction at Room Temperature | p. 263 |
| How to Study Tunneling Reactions in Biological Systems | p. 265 |
| Long-Lived Radicals in ¿-Irradiated Cells | p. 267 |
| Discovery of Long-Lived Radicals and Reactions with Vitamin C | p. 267 |
| Why Do Reactive Radicals Survive for a Long Time? | p. 269 |
| Assignment of Long-Lived Radicals | p. 272 |
| Reaction of Long-Lived Radicals with Vitamin C | p. 275 |
| Biological Effects of Tunneling Reaction of Long-Lived Radicals with Vitamin C | p. 277 |
| Tunneling Reaction of Long-Lived Radicals with Vitamin C | p. 280 |
| Conclusion and Future Development | p. 282 |
| References | p. 283 |
| Atom Tunneling Reaction of Vitamin E in Antioxidant, Prooxidant and Regeneration Reactions | p. 285 |
| Introduction | p. 285 |
| Tunneling Antioxidant Reaction of Vitamin E | p. 289 |
| Prooxidant Reaction of Vitamin E | p. 295 |
| Tunneling Regeneration Reaction of Vitamin E | p. 298 |
| Conclusion and Future Development | p. 301 |
| References | p. 302 |
| Index | p. 305 |
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