Image from page 439 of "The Bell System technical journal" (1922)
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ined by moving each point of the right-hand portions of these/ = 0+ curves a distance Vl horizontally to the right, as shown in the bottomtwo sketches. Here V depends on the ordinate in each diagram, taking onits maximum value Fquu when ii,a = 0 or E = Eo. Since T is proportionalto E^, the curve in the lower right diagram is a parabola in the range be- 40S BELL SYSTEM TECHNICAL JOIRXAL tweeii the front and the rear of the transient disturbance; this parabola, ifcontinued, would have its vertex at the origin. After a sufficiently long timea steady state will be reached in which the field for positive x has the uni-form value El and the density of holes the uniform value nu • It is possible to measure ;/;, as a function of / for fixed x by using a closelyspaced pair of probes to measure the potential gradient E, and convcxting Eto Hh by (3); alternatively, the current to a single negatively biased probecan be used as a measure of;;/. , if calibrated by the two-probe method. The t rihi
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Fig. 3—Schematic variation of hole density «/, with time / after the start of the injectedcurrent, at some given distance downstream from the injection electrode, in the approxi-mation neglecting dilTusion and recombination. portion of this curve of ih, against / for which 0 < ;/a Xole that the velocity of advance of the rear of the disturbance is less thanthat with which the holes drift in
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