What is the history of the discovery and development of the actinometry principle?
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Actinometry is the process of determining the intensity of light sources. The development of actinometry has involved the use of various chemical systems and physical devices to measure the number of photons absorbed in a defined space. Over time, different methods and substances have been proposed as chemical actinometers for different phases and applications, including gas, solid, microheterogeneous, and liquid phases. Actinometers have been used in the measurement of transient absorbances, quantum yield of phototransformation, and the absolute measurement of incident photon flux. Advantages and disadvantages of using chemical actinometers versus electronic devices for photon measurement have been discussed. Additionally, the use of photochromic systems in polymer blocks or matrices has gained interest for information storage and light measurement devices. Kinetic examinations and thermal rate constants are important for the classification and understanding of photochemical reactions in actinometry .
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