. Various photo-electrical investigations. ywith those for -E = 7, were subject to greater fluctuations varyingfrom 24 to 30 mm. The cause of this greater fluctuation, as wellas the reduction in magnitude, of the negative spectrophoto-electrical reaction with increase in intensity of the radiationstimulus remains for further investigation. In this connectionit is to be noted that the photonegative reaction is confined to a 6oo Scientific Papers of the Bureau of Standards. {Vol. tS very small spot in the crystal, and on the higher intensity theeffect of the surrounding medium (which is photopos
. Various photo-electrical investigations. ywith those for -E = 7, were subject to greater fluctuations varyingfrom 24 to 30 mm. The cause of this greater fluctuation, as wellas the reduction in magnitude, of the negative spectrophoto-electrical reaction with increase in intensity of the radiationstimulus remains for further investigation. In this connectionit is to be noted that the photonegative reaction is confined to a 6oo Scientific Papers of the Bureau of Standards. {Vol. tS very small spot in the crystal, and on the higher intensity theeffect of the surrounding medium (which is photopositive for allwave lengths of the radiation stimulus) may become perceptible. 2. AN EQUAL RESPONSE TO EQUAL ENERGY SPECTRUM. Experimenters have been searching for a photo-electrical ra-diometer which reacts proportionately to the intensity of theradiation stimulus and is nonselective to radiations extendingover a wide range of the spectrum. Such a radiometer would beuseful, though it is not absolutely necessary in a physical photo-meter. I. Fig. 7.—Spectrophoto-electrical reaction cui-ves of MoS^ samples Nos. 28and 29 at room temperature. Molybdenite sample No. 29 is remarkable in having its spectro-photo-electrical reaction at 23° C. confined practically to thevisible and near infra-red spectrum. This is illustrated in Figure7, curve D, which gives the spectrophoto-electrical reaction ofthe most sensitive part of this sample, which exhibits the photo-negative reaction at low temperatures. Curves A, B, and C depict the spectrophoto-electrical reactionsfor an adjacent photo-positive part of the crystal for spectralradiation intensities E = 1, 7, and 14, respectively. In the visiblespectrum the response increases but slightly and uniformJy Vvithwave length, and it is proportional to the intensity of the radiationstimulus. This is the first case observed in which the response is evenapproximately proportional to the intensity of the radiationstimulus, and is fairly uniform over
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Keywords: ., bookauthorcoblentz, bookcentury1900, bookdecade1920, bookyear1922
