. Various photo-electrical investigations. of patience in making up a suitable screen. X. SPECTROPHOTO-ELECTRICAL SENSITIVITY OF CUPROUSOXIDE AND OF LEAD-ANTIMONY SULPHIDE. These substances were kindly supplied by the Case Research Laboratory. 1. CUPROUS OXIDE. In Figure 9 is given the spectrophoto-electrical reaction curve ofa sample of cuprous oxide, CujO, in the form of a single semi- 6o4 Scientific Papers of the Bureau of Standards. [Vol. 18 translucent red crystal (size about 10 by 5 by mm) mountedin an evacuated glass bulb. The observations were made with a lens spectrometer having a
. Various photo-electrical investigations. of patience in making up a suitable screen. X. SPECTROPHOTO-ELECTRICAL SENSITIVITY OF CUPROUSOXIDE AND OF LEAD-ANTIMONY SULPHIDE. These substances were kindly supplied by the Case Research Laboratory. 1. CUPROUS OXIDE. In Figure 9 is given the spectrophoto-electrical reaction curve ofa sample of cuprous oxide, CujO, in the form of a single semi- 6o4 Scientific Papers of the Bureau of Standards. [Vol. 18 translucent red crystal (size about 10 by 5 by mm) mountedin an evacuated glass bulb. The observations were made with a lens spectrometer having arather wide slit. This probably explains the lack of resolutionof the small maximum at , observed by Pfvmd.^^ This sub-stance is conspicuous for its high photo-electrical sensitivity inthe blue-green of the visible spectrum. 2. LEAD-ANTIMONY SULPHIDE. The source of the sample of lead antimony sulphide, PbgSbSg,examined is uncertain—probably from lower California. In theletter transmitting the material Mr. Case mentioned that this. Jf .S .6 .7 .8 .9 IO/u. Fig. 9.—Spectrophoto-electrical reaction curves of cuprottsoxide and of lead-antimony sulphide. material differed slightly from the lead-antimony sulphides listedin mineralogy books, being more stable than any of the others. At room temperature the maximum of the spectrophoto-electrical reaction of PbaSbSg, observed in the usual manner witha mirror spectrometer and a quartz prism, occurs at At— 88°C. the maximtun is shifted to These data are inter-esting in supplementing previous observations showing thatthe photo-electrical reaction spectrum of a compound is differentfrom that of the constituents. In stibnite, SbjSs, the maximumoccurs at (a) BouLANGERiTE AND Jamesonite.—In a previous paper *it was shown that boulangerite, PbsSbgSe, and jamesonite,PbjSbjSs, change in resistance when exposed to light. !«Pfund, Phys. Rev. (2), 7, p. 289; 1916. B. S. Sci. Papers, No. 451; 1922.« B. S. Bull.
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