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Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors

Published

Author(s)

J R. Bolton, Michaela I. Stefan, Ping-Shine Shaw, Keith R. Lykke

Abstract

Abstract: The quantum yields for two popular actinometers have been determined using the tunable laser light source at the National Institute for Standards and Technology in Gaithersburg, MD. The power of this light source has been calibrated against an absolute cryogenic radiometer, considered accurate to better than 0.1%. The quantum yield at 253.7 nm for the ferrioxalate actinometer was found to be 1.38  0.03, which compares favorably with the value 1.40  0.03 determined by Goldstein and Rabani. The quantum yield at 253.7 nm for the KI/KIO3 actinometer was found to be 0.74  0.03 at 23 C. Again this compares favorably with 0.72  0.03 determined by Goldstein and Rabani and 0.73  0.03 determined by Rahn et al. Based on the determinations to date, including the present investigation, the recommended values for the quantum yields at 253.7 nm are 1.39 (temperature independent) for the ferrioxalate actinometer and 0.73 + 0.0104(t - 24) for the KI/KIO3 actinometer, where t is the temperature (C) of the actinometer solution. Finally, a protocol is recommended for the use of the KI/KIO3 actinometer to calibrate radiometers detectors at 253.7 nm.
Citation
Journal of photochemistry and photobiology. A, Chemistry
Volume
222

Keywords

actinometer, calibration, laser, quantum yield, utraviolet

Citation

Bolton, J. , Stefan, M. , Shaw, P. and Lykke, K. (2011), Determination of the quantum yield of the ferrioxalate and KI/KIO3 actinometers and a method for the calibration of radiometer detectors, Journal of photochemistry and photobiology. A, Chemistry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904114 (Accessed April 23, 2024)
Created July 4, 2011, Updated October 12, 2021