Description / Table of Contents: 1. The Mössbauer Effect1.1 Energetics of free-atom recoil and thermal broadening -- 1.2 Heisenberg natural linewidth -- 1.3 Energy and momentum transfer to the lattice -- 1.4 Recoil-free fraction and Debye-Waller factor -- 1.5 Cross-section for resonant reabsorption -- 1.6 A Mössbauer spectrum -- 2. Experimental Techniques -- 2.1 Velocity modulation of gamma-rays -- 2.2 Constant-velocity drives -- 2.3 Repetitive velocity-scan systems -- 2.4 Derivative spectrometers -- 2.5 Scattering experiments -- 2.6 Source and absorber preparation -- 2.7 Detection equipment -- 2.8 Cryogenic equipment and ovens -- 2.9 Velocity calibration -- 2.10 Curve fitting by computer -- 3. Hyperfine Interactions -- 3.1 Chemical isomer shift, ? -- 3.2 Second-order Doppler shift and zero-point motion -- 3.3 Effect of pressure on the chemical isomer shift -- 3.4 Electric quadrupole interactions -- 3.5 Magnetic hyperfine interactions -- 3.6 Combined magnetic and quadrupole interactions -- 3.7 Relative intensities of absorption lines -- 3.8 Relaxation phenomena -- 3.9 Anisotropy of the recoilless fraction -- 3.10 The pseudoquadrupole interaction -- 4. Applications of the Mössbauer Effect -- 4.1 Relativity and general physics -- 4.2 Nuclear physics -- 4.3 Solid-state physics and chemistry -- 5. 57Fe - Introduction -- 5.1 The ?-decay scheme -- 5.2 Source preparation and calibration -- 5.3 Chemical isomer shifts -- 5.4 Quadrupole splittings -- 5.5 Magnetic interactions -- 5.6 Polarised radiation studies -- 5.7 Energetic nuclear reactions -- 5.8 The 136-keV transition -- 6. High-spin Iron Complexes -- A. High-Spin Iron(II) Complexes -- 6.1 Iron(II) halides -- 6.2 Iron(II) salts of oxyacids and other anions -- 6.3 Iron(II) complexes with nitrogen ligands -- B. High-Spin Iron(III) Complexes -- 6.4 Iron(III) halides -- 6.5 Iron(III) salts of oxyacids -- 6.6 Iron(III) complexes with chelating ligands -- 7. Low-spin Iron(II) and Iron(III) Complexes -- 7.1 Ferrocyanides -- 7.2 Ferricyanides -- 7.3 Prussian blue -- 7.4 Substituted cyanides -- 7.5 Chelating ligands -- 8. Unusual Electronic Configurations of Iron -- 8.1 Iron(II) compounds showing 5T2?1A1 crossover -- 8.2 Iron(III) compounds showing 6A1?2T2 crossover -- 8.3 Iron(II) compounds with S = 1 spin state -- 8.4 Iron(III) compounds with S = 1/3 spin state -- 8.5 Iron 1,2-dithiolate complexes -- 8.6 Systems containing iron(I), iron(IV), and iron(VI) -- 9. Covalent Iron Compounds -- 9.1 Binary carbonyls, carbonyl anions, and hydride anions -- 9.2 Substituted iron carbonyls -- 9.3 Ferrocene and other ?-cyclopentadienyl derivatives -- 10. Iron Oxides and Sulphides -- 10.1 Binary oxides and hydroxides -- 10.2 Spinel oxides AB2O4 -- 10.3 Other ternary oxides -- 10.4 Iron(IV) oxides -- 10.5 Iron chalcogenides -- 10.6 Silicate minerals -- 10.7 Lunar samples -- 11. Alloys and Intermetallic Compounds -- 11.1 Metallic iron -- 11.2 Iron alloys -- 11.3 Intermetallic compounds -- 12. 57Fe - Impurity Studies -- 12.1 Chemical compounds -- 12.2 Metals -- 12.3 Miscellaneous topics -- 13. Biological Compounds -- 13.1 Haemeproteins -- 13.2 Metalloproteins -- 14. Tin-119 -- 14.1 ?-Decay scheme and sources -- 14.2 Hyperfine interactions -- 14.3 Tin(II) compounds -- 14.4 Inorganic tin(IV) compounds -- 14.5 Organotin(IV) compounds -- 14.6 Metals and alloys -- 15. Other Main Group Elements -- 15.1 Potassium (40K) -- 15.2 Germanium (73Ge) -- 15.3 Krypton (83Kr) -- 15.4 Antimony (121Sb) -- 15.5 Tellurium (125Te) -- 15.6 Iodine (127I, 129I) -- 15.7 Xenon (129Xe, 131Xe) -- 15.8 Caesium (133Cs) -- 15.9 Barium (133Ba) -- 16. Other Transition-metal Elements -- 16.1 Nickel (61Ni) -- 16.2 Zinc (67Zn) -- 16.3 Technetium (99Tc) -- 16.4 Ruthenium (99Ru) -- 16.5 Silver (107Ag) -- 16.6 Hafnium (176Hf, 177Hf, 178Hf, 180Hf) -- 16.7 Tantalum (181Ta) -- 16.8 Tungsten (182W, 183W, 184W, 186W) -- 16.9 Rhenium (187Re) -- 16.10 Osmium (186Os, 188Os, 189Os) -- 16.11 Iridium (191Ir, 193Ir) -- 16.12 Platinum (195Pt) -- 16.13 Gold (197Au) -- 16.14 Mercury (201Hg) -- 17. The Rare-earth Elements -- 17.1 Praseodymium (141Pr) -- 17.2 Neodymium (145Nd) -- 17.3 Promethium (147Pm) -- 17.4 Samarium (149Sm, 152Sm, 154Sm) -- 17.5 Europium (151Eu, 153Eu) -- 17.6 Gadolinium (154Gd, 155Gd, 156Gd, 157Gd, 158Gd, 160Gd) -- 17.7 Terbium (159Tb) -- 17.8 Dysprosium (160Dy, 161Dy, 162Dy, 164Dy) -- 17.9 Holmium (165Ho) -- 17.10 Erbium (164Er, 166Er, 167Er, 168Er, 170Er) -- 17.11 Thulium (169Tm) -- 17.12 Ytterbium (170Yb, 171Yb, 172Yb, 174Yb, 176Yb) -- 18. The Actinide Elements -- 18.1 Thorium (232Th) -- 18.2 Protactinium (231Pa) -- 18.3 Uranium (238U) -- 18.4 Neptunium (237Np) -- 18.5 Americium (243Am) -- Appendix 1. Table of nuclear data for Mössbauer transitions -- Appendix 2. The relative intensities of hyperfine lines -- Notes on the International System of Units (SI) -- Author Index.