title: Quantum yield: the term and the symbol. A historical search.
abstract: 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 Phi, became accepted usage in a haphazard manner, which is presented in this paper.
authors.affiliation: Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, Israel. chrubin@tx.technion.ac.il
authors.forename: Mordecai B
authors.initials: MB
authors.lastname: Rubin
authors.forename: Silvia E
authors.initials: SE
authors.lastname: Braslavsky
mesh_terms: D049673:History, 20th Century; D049674:History, 21st Century; D011789:Quantum Theory