title: OPTICAL ABSORPTION OF THE PORPHYRIN FREE RADICAL FORMED IN A REVERSIBLE PHOTOCHEMICAL REACTION.
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D005609:Free Radicals; D011166:Porphyrins; D012106:Research; D013053:Spectrophotometry
chemical_list: D005609:Free Radicals; D011166:Porphyrins
keywords: CHEMISTRY, PHYSICAL; EXPERIMENTAL LAB STUDY; PORPHYRINS; SPECTROPHOTOMETRY