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Pure Appl. Chem.
76(12), 2105-2146, 2004
Pure and Applied
Vol. 76, Issue 12
ORGANIC AND BIOMOLECULAR CHEMISTRY DIVISION
SUBCOMMITTEE ON PHOTOCHEMISTRY
Chemical actinometry (IUPAC Technical Report)
H. J. Kuhn, S.
E. Braslavsky*, and R. Schmidt
Abstract: This document updates the first version of the IUPAC
technical report on Chemical actinometers published in Pure
Appl. Chem. 61 ,187-210 (1989). Since then, some methods have been
improved, procedures have been modified, and new substances have been
proposed as chemical actinometers. An actinometer is a chemical system
or a physical device by which the number of photons in a beam absorbed
into the defined space of a chemical reactor can be determined integrally
or per time. This compilation includes chemical actinometers for the
gas, solid, microheterogeneous, and liquid phases, as well as for the
use with pulsed lasers for the measurement of transient absorbances,
including the quantum yield of phototransformation, as well as the literature
for each of the actinometers. The actinometers listed are for the use
in the wavelength range from the UV to the red region of the spectrum.
A set of recommended standard procedures is also given. Advantages and
disadvantages are discussed regarding the use of chemical actinometers
vs. electronic devices for the measurement of the number of photons
absorbed. Procedures for the absolute measurement of incident photon
flux by means of photodiodes are also discussed.
* Corresponding author.
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