## The Quantum Theory of Radiation"It is difficult to imagine any more useful, or more instructive textbook than this." — Transactions of the Faraday Society This book was the first comprehensive treatment of quantum physics to appear in any language. Originally published in 1936 as part of Oxford University Press's famed International Series of Monographs on Physics, this book is a classic reference text. Although new particles have been discovered since the third edition was published in 1954, its presentation of quantum physics is still relevant because the basic theory remains unchanged. Moreover, its historical perspective is unique and its physical insight substantial; thus, it remains in demand among physics professors, students, and researchers. Beginning with Maxwell and Lorentz's work, W. Heitler, in his lifetime a noted physics professor at the University of Zurich, covers seven major theoretical areas: • the classical theory of radiation |

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### Contents

Scattering Absorption | 34 |

QUANTUM THEORY OF THE PURE RADIATION FIELD | 54 |

Commutation and Uncertainty Relations op the Fleld Strengths | 76 |

Copyright | |

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### Common terms and phrases

4-vector absorption angle anticommutes approximation atom average Bremsstrahlung calculated charge classical theory commutation relations components Compton effect Compton scattering consider contribution Coulomb gauge cross-section curves denote density depends distribution divergent effect emission emitted energy loss expectation value external field factor field strengths finite formula free electron free particles frequency given Hamiltonian high energies initial integration invariant joining points light quantum line breadth Lorentz condition Lorentz gauge Lorentz transformation magnetic mass matrix element momenta negative electron negative energy non-relativistic obtain occur operator order of magnitude oscillator pair creation photon Phys polarization positive electron positron primary Proc quantities quantization quantum electrodynamics quantum theory radiation field radiative corrections relativistic replaced represents result satisfied scattering second quantization second term self-energy subsection tensor test body tion transformation transition probability vacuum vacuum polarization vanishes variables vector velocity virtual wave equation wave function zero