# A Modern Approach to Quantum Mechanics, second edition

## By John S. Townsend

**Hardback**

Jul 2012 , 592 pp

ISBN 9781891389788

**Price:**£88.99, $125.00

**lays out the foundations of quantum mechanics through the physics of intrinsic spin. Written to serve as the primary textbook for an upper-division course in quantum mechanics, Townsend's text gives professors and students a refreshing alternative to the old style of teaching, by allowing the basic physics of spin systems to drive the introduction of concepts such as Dirac notation, operators, eigenstates and eigenvalues, time evolution in quantum mechanics, and entanglement.. Chapters 6 through 10 cover the more traditional subjects in wave mechanics—the Schrödinger equation in position space, the harmonic oscillator, orbital angular momentum, and central potentials—but they are motivated by the foundations developed in the earlier chapters. Students using this text will perceive wave mechanics as an important aspect of quantum mechanics, but not necessarily the core of the subject. Subsequent chapters are devoted to perturbation theory, identical particles, scattering, and the interaction of atoms with radiation, and an optional chapter on path integrals is also included. This new edition has been revised throughout to include many more worked examples and end-of-chapter problems, further enabling students to gain a complete mastery of quantum mechanics. It also includes new sections on quantum teleportation, the density operator, coherent states, and cavity quantum electrodynamics.**

__A Modern Approach to Quantum Mechanics, Second Edition__CHAPTER 1 Stern–Gerlach Experiments

CHAPTER 2 Rotation of Basis States and Matrix Mechanics

CHAPTER 3 Angular Momentum

CHAPTER 4 Time Evolution

CHAPTER 5 A System of Two Spin-1/2 Particles

CHAPTER 6 Wave Mechanics in One Dimension

CHAPTER 7 The One-Dimensional Harmonic Oscillator

CHAPTER 8 Path Integrals

CHAPTER 9 Translational and Rotational Symmetry in the Two-Body Problem

CHAPTER 10 Bound States of Central Potentials

CHAPTER 11 Time-Independent Perturbations

CHAPTER 12 Identical Particles

CHAPTER 13 Scattering

CHAPTER 14 Photons and Atoms

Appendix A Electromagnetic Units

Appendix B The Addition of Angular Momenta

Appendix C Dirac Delta Functions

Appendix D Gaussian Integrals

Appendix
E The Lagrangian for a Charge *q *in a Magnetic Field

Appendix F Values of Physical Constants

Appendix G Answers to Selected Problems

*Index*