Einstein's Photochemical Equivalence Law, i.e. one quantum of light absorbed per molecule, played a very important role in the development of photochemistry in the early part of the 20th century. The corresponding terminology, quantum yield and its symbol Φ, became accepted usage in a haphazard manner, which is presented in this paper.
M. B. Rubin and S. E. Braslavsky, Photochem. Photobiol. Sci., 2010, 9, 670 DOI: 10.1039/B9PP00182D
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