Download An Introduction To Quantum Physics by Anthony Philip French Edwin F.Taylor PDF

By Anthony Philip French Edwin F.Taylor

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These (b) calculated energies appear at the Figure left 1-1 2(b) of and parenthetically, as analyze the energy distribution of the scattered electrons voltages, in Figure coming l-12(a). ] spaced some chosen direction. 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.

Con- structive interfer- ence Incident among planes requires nk = 2d sin x rays 6. Thus x rays of given wavelength will be strongly re- flected by the array only for particular values of 6. precise character of x rays and the atomic lattice structure of crystals. 32 The by von Laue treated the problem, as one must, in terms of the scattering of an incident x-ray beam by all the individual atoms in the three-dimensional lattice that makes up a crystal. This is somewhat formidable, but very soon afterwards (in 1913), W.

Tron charge. (This reduction of effective charge Eq. 1-25, with nf =\, c If _ we 2ir 2 me 2 take n { Q spectra. ) Call the Bohr formula, who have 2 = (1-26) (>-*) 2 in Eq. 1-26, recognized as the line wavelength) is Then from the effective central charge Q. known as we K a in define the exact counterpart of the line in the Lyman what Moseley the characteristic x-ray first series of hydrogen. (longest- (The x-ray coded according to the shell on which the quantum jump terminates. ) Thus we have lines are , t „(*) = Then if !

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