. Studies in physics. lectrons, q, is equal to the rate of recombination, ad2, and M is the crystal is in equilibrium in the light AC/ At = M+ aCd2] M = AC I At - ad = aCi2 — hoc. cit. NoL-5VI1] EFFECT 0F TEMPERATURE ON METALLIC SELENIUM. 559 Table III. Crystal No. 2,in °Abs. Q (Ohms-1 X 10.) C(Ohms -ix17-) Cx—C,l (Ohms-lXio.) M 184 .106 205 .135 233 .583 273 293 299 306 316 326 348
. Studies in physics. lectrons, q, is equal to the rate of recombination, ad2, and M is the crystal is in equilibrium in the light AC/ At = M+ aCd2] M = AC I At - ad = aCi2 — hoc. cit. NoL-5VI1] EFFECT 0F TEMPERATURE ON METALLIC SELENIUM. 559 Table III. Crystal No. 2,in °Abs. Q (Ohms-1 X 10.) C(Ohms -ix17-) Cx—C,l (Ohms-lXio.) M 184 .106 205 .135 233 .583 273 293 299 306 316 326 348 Crystal No. 13. 233 .588 266 283 294 305 314 Table III. and Fig. 6 show the effect of temperature upon light sensi-tiveness as defined by the practical working definition, Ci — Cd. It willbe seen that the sensitiveness at first increases with increase of tempera- *. 350 ture to about the region of room temperature after which it L. P. Sieg1 has noted that selenium plates show a decrease in sensi-tiveness to light, from room temperature to ioo° C. when the lightsensitiveness is defined as the ratio of conductivity in the light to the 1 Phys. Rev., Series 2, Vol. 6, p. 213,1915. 560 KATHRYN JOHNSTONE DIETERICH. [SecondLSeries. conductivity in the dark. Fig. 7 shows the same general relation betweentemperature and light sensitiveness, when the latter is measured by therate of production, M, of electrons by the light. 50 35 O- - Crystal /No. 2.© Crystal Bo. 13.
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