photoabsorption
/ˌfəʊtəʊəbˈzɔːpʃn/ /ˌfəʊtəʊəbˈsɔːpʃn/Physics and Chemistry
noun
Absorption of light; specifically absorption of a photon by the electron shell surrounding an atomic nucleus.
Origin
1930s; earliest use found in Proceedings of the Royal Society of London. From photo- + absorption.