. Studies in physics. uite a sharp kink at 350 C. Thus, eachof the three types of crystals showed the same effect of temperature onthe coefficient of recombination: a general decrease in a with increaseof temperature. H. A. Erikson,1 in 1909, made a determination of the effect of tempera-ture upon the coefficient of recombination in gases. He obtained a curveshowing the relation between a and T which resembles very closely thecurve obtained for crystal No. 2, Fig. 2. His curve is shown in Fig. , no definite significance can be attached to this striking simil-arity as a result of this
. Studies in physics. uite a sharp kink at 350 C. Thus, eachof the three types of crystals showed the same effect of temperature onthe coefficient of recombination: a general decrease in a with increaseof temperature. H. A. Erikson,1 in 1909, made a determination of the effect of tempera-ture upon the coefficient of recombination in gases. He obtained a curveshowing the relation between a and T which resembles very closely thecurve obtained for crystal No. 2, Fig. 2. His curve is shown in Fig. , no definite significance can be attached to this striking simil-arity as a result of this investigation only. 1 Phil. Mag., Series 6, Vol. 18, p. 328, 1909. 556 KATHRYN JOHNSTONE DIETERICH. [SecondLSeries. If then, the recovery of selenium crystals is due to a recombinationof negative electrons with positive residues, and the rate of recombina-tion is expressed by the formula, AC At aC2, the coefficient of recombination, a, varies with temperature. Plotted from ErikBOnB data, Phil. Mag.,18, p 335, 1909. It will be noticed, in Tables I. and II., that, while the coefficient ofrecombination is not a constant at all temperatures, the product, a X C,is very nearly so. A glance at the curves, Figs. 2 and 3, will show thatthis relation suggests itself here also; since wherever a rise occurs in thea-curve a depression appears in the C-curve. The same general relationbetween the shape of the a-curve and the C-curve is apparent in Eriksonswork in gases, Fig. 4. Dr. Brown1 has found that a X C is a constant forselenium crystals when pressure or voltage varied the conductivity,although a is not constant. Since a X C is a constant and is equal to AC/C X At, the rate ofrecovery during the first short interval of time is equal to some constant,fi, times the conductivity in the light. AC I At a C- = (3C; where /3 is equal to a X C, and we have the simple relation that the rateof recovery of selenium crystals is proportional to the conductivity in thelight. This proportionality
Size: 2129px × 1173px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidstudiesinphy, bookyear1909
