title: Structure elucidation of laser-dye coumarin-540A by joint application of X-ray diffraction, X-ray fluorescence, prompt fluorescence, UV and visible spectroscopy.
abstract: X-ray, ultraviolet, and visible light induced photophysical changes of coumarin-540A in ethanol has been studied by the joint applications of X-ray, ultraviolet, and visible spectroscopy. Some impurities were found by X-ray fluorescence measurements. During the high power optical pumping, coumarin showed photochemical changes. Photoproduct emission spectra characteristics showed that photoproduct molecules could also be used as a laser-dye at a different emission frequency in the ultraviolet region.
authors.affiliation: Department of Biomedical Engineering, Yeditepe University, 34755 Istanbul, Turkey.
authors.forename: Sinan S
authors.initials: SS
authors.lastname: Keskin
authors.forename: Necdet
authors.initials: N
authors.lastname: Aslan
authors.forename: Fuat
authors.initials: F
authors.lastname: Bayrakçeken
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D004340:Drug Contamination; D000431:Ethanol / Q000737:chemistry; D005453:Fluorescence; D007834:Lasers; D015394:Molecular Structure; D010777:Photochemistry; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D014961:X-Ray Diffraction
chemical_list: D003374:Coumarins; D012997:Solvents; D000431:Ethanol