A simple automated system designed to monitor quantum efficiency as a function of photon energy is described. Photocurrents ranging from 10−6 to 10−12 A can be measured continuously as a function of radiation energy and the corresponding logarithmic yield is plotted directly on a recorder. The main advantages are a drastic reduction of the measuring time and higher resolution compared to conventional point‐by‐point methods.

Topics
Radiation energy, Photoconductivity, Quantum efficiency, Photochemical reactions
1.
D. E.
Eastman
,
Phys. Rev. B
8
,
6027
(
1973
).
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2.
Operational amplifier model 301, Keithley Instruments Inc., 28775 Aurora Rd., Cleveland, OH 44139.
3.
Model AD 751 P, Analog Devices, Industrial Park, Norwood, MA 02062.
4.
Product note “Using Logarithmic Current Elements with the Keithley Model 300 Electrometer Operational Amplifier,” Keithley Instruments Inc., 28775 Aurora Rd., Cleveland, OH 44139.
5.
Model 82S23 32×8 ROM, Signetics, 811 East Arques Ave. Sunnyvale, CA 94086.
6.
Model SN74154, Texas Instruments Inc., P.O. Box 5012, Dallas, TX 75222.
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© 1977 American Institute of Physics.
1977
American Institute of Physics
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