photospectroscopic
/ˌfəʊtə(ʊ)ˌspɛktrəˈskɒpɪk/adjective
Of, relating to, or involving photospectroscopy.
Origin
Late 19th century; earliest use found in William de Wiveleslie Abney (1843–1920), civil servant and photographic scientist. From photo- + spectroscopic, after photospectroscopy.