The Quantum Theory of Radiation

4-vector absorbed according amplitudes angle annihilation atom Born's approximation Bremsstrahlung calculated charge classical theory collisions component Compton scattering consider Coulomb curves denotes density Dirac direction of polarization emitted energy and momentum energy loss external field field strengths formula free electron frequency given gives Hamiltonian high energies insert integral intensity distribution interaction intermediate k₁ kinetic energy Klein-Nishina formula light quantum light wave longitudinal waves Lorentz Lorentz transformation matrix elements mc² measurement negative electron negative energy non-relativistic nucleus number of light obtain order of magnitude P. A. M. Dirac pair pair production particle photoelectric Phys plane wave positive electron primary energy quanta quantization quantum electrodynamics quantum mechanics quantum theory radiation oscillators region relativistic represents satisfy self-energy self-force subsection summation term test body tion transition probability uncertainty relation vanishes vector velocity wave equation wave function wave-length y-rays zero