Applied Group Theory
Selected Readings in Physics
Published on 29. July 2016
430 pages
978-1-4831-4938-7 (ISBN)
Description
Selected Readings in Physics: Applied Group Theory provides information pertinent to the fundamental aspects of applied group theory. This book discusses the properties of symmetry of a system in quantum mechanics. Organized into two parts encompassing nine chapters, this book begins with an overview of the problem of elastic vibrations of a symmetric structure. This text then examines the numbers, degeneracies, and symmetries of the normal modes of vibration. Other chapters consider the conditions under which a polyatomic molecule can have a stable equilibrium configuration when its electronic state has orbital degeneracy. This book discusses as well the effect of an electric field having a given symmetry upon an atom. The final chapter deals with the symmetry of crystals with a magnetic moment. This book is intended to be suitable for final-year students and fresh postgraduate students in physics. Physicists and researcher workers will also find this book extremely useful.
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Content
PrefacePart 1 I. Symmetry 1.1. Symmetry Operations 1.2. Definition of a Group 1.3. Symmetry in Nature II. Theory of Groups 2.1. Further Definitions 2.2. Subgroups 2.3. Classes 2.4. Matrices 2.5. Matrices and the Symmetry Operations of the Square 2.6. Matrix Representations of a Group 2.7. Irreducible (Matrix) Representations of a Group 2.8. The Deduction of the Irreducible Representations of a Group 2.9. The Direct Product of Two Groups 2.10. Group Theory and Quantum Mechanics, Wigner's Theorem III. Crystallographic Groups 3.1. Point Groups 3.2. The Derivation of the Point Groups and their Character Tables 3.3. The Basis of a Representation 3.4. Bravais Lattices 3.5. Space Groups 3.6. Seitz Space-group Symbols IV. The Rotation, Symmetric and Lorentz Groups 4.1. The Rotation Group 4.2. The Representations of the Rotation Group 4.3. The Spherical Harmonics and the Rotation Group 4.4. The Permutation Group, or Symmetric Group, S(n) 4.5. Young's Tableaux 4.6. Special Relativity and the Lorentz Group V. Vibrations in Molecules and Solids 5.1. Vibrations of Molecules, Normal Modes 5.2. Example, the Normal Modes of the Methane Molecule 5.3. Vibrations of Solids, Phonons 5.4. Brillouin Zone Theory 5.5. Infra-red and Raman Activity of the Normal Modes VI. Electronic States in Atoms, Molecules and Solids 6.1. Wave Functions of Electrons in Atoms 6.2. Wave Functions of Electrons in Molecules 6.3. The Jahn-Teller Effect 6.4. The Splitting of Atomic Energy Levels in Crystals 6.5. Wave Functions of Electrons in Solid VII. Atoms, Nuclei and Elementary Particles 7.1. The Principle of Antisymmetry and the Pauli Exclusion Principle 7.2. The Spherical Harmonics and Angular Momentum 7.3. Selection Rules for Electrons in Atoms 7.4. Spin, SU(2) 7.5. Nuclei, Isobaric Spin 7.6. "Elementary" Particles, SU(3), etc. VIII. Further Topics 8.1. Double Groups 8.2. Magnetic Point Groups and Magnetic Space Groups 8.3. Time Reversal and the Kramers Degeneracy 8.4. Symmetry Properties of Tensors 8.5. Waveguide Junctions 8.6. Campanological GroupsGuided BibliographyReferencesPart 2 1. The Elastic Characteristic Vibrations of Symmetrical Systems 2. The Degeneracy, Selection Rules, and Other Properties of the Normal Vibrations of Certain Polyatomic Molecules 3. Stability of Polyatomic Molecules in Degenerate Electronic States. I 4. Splitting of Terms in Crystals 5. On the Reduction of Space Groups 6. Theory of Brillouin Zones and Symmetry Properties of Wave Functions in Crystals 7. On the Consequences of the Symmetry of the Nuclear Hamiltonian on the Spectroscopy of Nuclei 8. "Double" Crystallographic Groups 9. Magnetic Symmetry of CrystalsAppendix. The Character Tables of the Thirty-Two Point GroupsHints to Solutions of the ExercisesIndex
