By Anthony Philip French Edwin F.Taylor
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Extra info for An Introduction To Quantum Physics
Phys. Cong, n W. Ritz, Phys. Z. 9, 521 (1908); Astrophys. J. 28, 237 (1908). ,0 16 Simple models of the atom the energy difference between one particular energy level in the hydrogen 1-6 atom and each of a number of other levels. PHOTONS The A realization that the reciprocal wavelength, rather than the convenient parameter to describe the lines of a itself, is spectrum know, is profoundly important. to the fact that radiant It corresponds, as energy is quantized we now in units which have energy E proportional to the optical frequency and hence inversely proportional to wavelength (v = c/X).
Figure 1-1 3a indicates the kind of experimental arrangement by which this can be studied, using a magnetic field to curve the paths of the elec- trons and a photographic plate to record their arrival — the ra- dius of curvature of the paths being proportional to the electron 32 off in momentum. Figure 1-1 3b shows the results of such Simple models of the atom measurements, using helium as the target gas. In addition to the elastically scattered electrons, there are other groups of electrons of lower energy, corresponding to scattering processes in which the bombarding electrons lose kinetic energy and the electrons of the target atoms are excited to higher energy Since kinetic energy levels.
H. Compton, Phys. Rev. 22, 409 (1923). For details and a discussion of the relativistic dynamics of the process see, for example, the volume Special Relativity in this series. 23 1-6 Photons we here, have, for clarity, presented the evidence for photons before discussing the Bohr theory 1-7 itself. THE RUTHERFORD-BOHR ATOMRutherford's discovery of the nucleus, on the basis of the famous alpha-particle scattering experiments done in his laboratory by Geiger and Marsden in 1909, 18 demanded a picture of atomic structure completely different from the model described earlier.
An Introduction To Quantum Physics by Anthony Philip French Edwin F.Taylor