An Introduction to the Electron Theory of Solids. Metallurgy by John Stringer

By John Stringer

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Extra resources for An Introduction to the Electron Theory of Solids. Metallurgy Division

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2) depends on the detailed shape of the wave group, but in general there is always a constant product of the length of a pulse signal and the range of wave numbers required to carry it. In this expression we have introduced the "wave number" k defined by k == 2n/X where A is the wavelength. 38 ELECTRON THEORY OF SOLIDS From the wave point of view therefore our experiment to isolate a single quantum has distorted the original pure signal, and the degree of distortion increases as the packet is shortened by reducing the opening time of the shutter.

28 ELECTRON THEORY OF SOLIDS This prediction of Bohr's theory was checked experimentally by Stern and Gerlach in 1921, who determined the effect of an inhomogeneous magnetic field on a beam of silver atoms. If a small magnet is placed in a homogeneous magnetic field there is no resultant translatory force, but there is in an inhomogeneous field. Consequently, each silver atom experienced a resultant force, determined by its magnetic moment, tending to deviate it from its original path. The atoms passing through the field were allowed to condense on a screen.

If k = 0, the orbit would be a straight line passing through the proton, the so-called "pendulum swing" orbit. ,«. The integer n, how­ ever, solely determines the energy of the state, and in accordance with the empirical theory is called the principal quantum number. 2. m 2 3 4 5 6 7 ISOTOPIC DISPLACEMENT OF THE LYMAN SERIES (n = 1) A x 10" 8 cm (calculated) AAxlO" 8 cm H D calculated observed 1215-664 1025-718 972-533 949-739 937-800 930-744 1215-334 1025-439 972-269 949-481 937-545 930-491 0-330 0-279 0-264 0-258 0-255 0-253 0-330 0-276 0-266 0-262 0-274 0-258 (From Moelwyn-Hughes: p.

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