A theoretical analysis of the shape of photoconductivity spectral distribution curves is presented, based upon the effects of surface and volume recombination of the charge carriers liberated by the light. Representative curves of photoconductivity vs absorption are computed and compared with experimental observations. As an application of this analysis, experimental data for antimony sulfide are compared with a theoretical curve, and the difference is found to be resolvable into two bands representing nonphotoconductive transitions. PHrvrnrnNnurTiviTY-" ." NORMALIZED TO LO PEAK s^ \ \ \ \ J \ / A

PHOTOCONDUCTIVITY AND PHOTOELECTRIC EMISSION OF BaO 805shown in Figs. 1(b) and (c) with air rather than BaO between the electrodes. 12 In electrostatic units C= (fV40 + (r/2T)(l-ln2); «A)«1, where r is the electrode radius and t is the thickness of the air-gap. The first term is the familiar major term, the second is an end correction term from the charge collected on the flat surface near the intersection of the cylindrical and flat circular surfaces. The end correction from charge on the cylindrical surfaces cannot be correctly obtained by conformal mapping (since this method strictly applies to two-dimensional problems only), and it is omitted here for the following reason: if one introduces a slab of BaO instead of air, its periphery being shaped like the outermost line of force from charge on the intersection between the cylindrical and flat circular surfaces, then the field in the surrounding air remains undistorted. Hence, the difference between the BaO 12 This problem is similar to finding the magnetic field between the magnetic poles of a cyclotron, as discussed by M. E. Rose, Phys. Rev. 53, 715 (1938).

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