Epr of Exchange Coupled Systems

, by Bencini, Alessandro; Gatteschi, Dante

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ISBN: 9780486488547 | 0486488543
Cover: Paperback
Copyright: 7/17/2012

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The expert authors of this monograph and professional reference include Dante Gatteschi, a pioneer of molecular magnetism. Based on the spin Hamiltonian approach, this unified treatment makes extensive use of irreducible tensor techniques to analyze systems in which two or more spins are magnetically coupled. 177 figures, 38 tables, and a new Introduction by Dr. Gatteschi. 1990 edition.

Exchange and Superexchange	p. 1
The Exchange Interaction	p. 1
Anderson's Theory	p. 3
Molecular Orbital Exchange Models	p. 9
Quantitative MO Calculations of Singlet-Triplet Splitting	p. 15
Spin Hamiltonians	p. 20
The Spin Hamiltonian Approach	p. 20
The Magnetic Spin-Spin Interaction	p. 22
The Exchange Contribution	p. 27
Biquadratic Terms	p. 34
Justification of the Spin Hamiltonian Formalism	p. 34
Exchange Involving Degenerate States	p. 38
Exchange in Mixed Valence Species	p. 42
Spectra of Pairs	p. 48
The Spin Hamiltonian for Interacting Pairs	p. 48
Spin Levels in the Strong Exchange Limit	p. 49
Spectra of Pairs in the Strong Exchange Limit	p. 57
Spin Levels in the Weak Exchange Limit	p. 66
Spectra of Pairs in the Weak Exchange Limit	p. 74
Intermediate Exchange	p. 77
Spectra of Clusters	p. 86
The Spin Hamiltonian for Oligonuclear Systems of Interacting Spins	p. 86
Spin Levels of Exchange Coupled Clusters in the Strong Exchange Limit	p. 87
Spin Levels of Trinuclear Clusters	p. 91
Spin Levels of Tetranuclear Clusters	p. 93
Spin Levels of Linear Clusters	p. 99
EPR Spectra of Exchange Coupled Clusters in the Strong Exchange Limit	p. 100
EPR Spectra of Trinuclear Clusters	p. 106
EPR Spectra of Tetranuclear Clusters	p. 113
Relaxation in Oligonuclear Species	p. 121
Introduction	p. 121
Theoretical Basis of Spin Relaxation in Pairs	p. 121
Iridium (IV) Pairs	p. 125
Copper Pairs	p. 130
Two-Iron-Two-Sulfur Ferredoxins	p. 131
Relaxation in Larger Clusters	p. 132
Spectra in Extended Lattices	p. 135
Exchange and Dipolar Interactions in Solids	p. 135
Exchange Narrowing	p. 139
Additional Broadening Mechanisms	p. 150
Exchange Narrowing in Lower Dimensional Systems	p. 155
The Effect of Weak Interchain Coupling	p. 158
Half-Field Transitions	p. 160
Temperature Dependence of the Spectra	p. 162
Frequency Dependence of the Line Widths	p. 165
Selected Examples of Spectra of Pairs	p. 167
Early Transition Metal Ion Pairs	p. 167
Copper Pairs	p. 173
Heterometallic Pairs	p. 182
Organic Biradicals	p. 187
Coupled Transition-Metal Ions-Organic Radicals	p. 193
Introduction	p. 193
Nitroxides Directly Bound to Metal Ions	p. 193
Weak Exchange with Nitroxides	p. 200
Semiquinones	p. 203
Biological Systems	p. 210
Introduction	p. 210
Copper Proteins	p. 210
Iron Proteins	p. 214
Iron Porphyrins and Heme Proteins	p. 215
Iron-Sulfur Proteins	p. 217
Sulfite Reductase	p. 222
Nitrogenase	p. 223
Iron-Binding Proteins Without Cofactors or Sulfur Clusters	p. 224
Exchange-Coupled Species in the Photosynthetic O₂-Evolving Complexes	p. 227
Low Dimensional Materials	p. 235
Linear Chain Manganese(II)	p. 235
Linear Chain Copper(II)	p. 239
Two-Dimensional Manganese(II)	p. 246
Two-Dimensional Copper(II)	p. 247
Excitons	p. 253
Introduction	p. 253
Excitons	p. 253
EPR of Triplet Excitons in Linear Organic Radical Systems	p. 255
Second Quantization	p. 266
Properties of Angular Momentum Operators and Elements of Irreducible Tensor Algebra	p. 272
Properties of Angular Momentum Operators	p. 272
Addition of Two Angular Momenta. Clebsch-Gordon Coefficients and "3j" Symbols	p. 272
Definitions	p. 272
Equivalent Definitions	p. 273
Phase Convention and Properties	p. 273
The "3J" Symbols	p. 273
Methods of Calculations	p. 274
Special Formulae	p. 275
The "6j" Symbols and the Racah W Coefficients	p. 275
Definitions	p. 275
Properties	p. 276
Methods of Calculation	p. 277
Special Formulae	p. 277
The "9j" Symbols	p. 278
Definition	p. 278
Properties	p. 279
Special Formulae	p. 279
Irreducible Tensor Operators	p. 280
Definitions	p. 280
Compound Irreducible Tensor Operators	p. 280
Tensor Product of Two First-Rank Irreducible Tensor Operators	p. 281
Properties of Irreducible Tensor Operators	p. 282
Reduced Matrix Elements of Special Operators	p. 283
Subject Index	p. 285
Table of Contents provided by Ingram. All Rights Reserved.

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Epr of Exchange Coupled Systems

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