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Double Beam Nanosecond Laser Flash Photolysis for Precise Measurement of Small Absorbances in Transient Spectroscopy: Observation of Decay Profile of the Excited Triplet State of Tetraphenylporphyrinatoantimony(V) With Absorbance Smaller Than 0.01

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Double beam laser flash photolysis has been newly developed for precise measurement of small absorbances in transient spectroscopy. The monitoring light beam was divided into two parts; one beam for monitoring the sample and a reference one. The two beams were simultaneously monitored by two similar independent photomultipliers and recorded on a two channel digital storage oscilloscope. The method enabled observation of signals within the full range of the pulse width of Xe lamp around 100 μs. Even a decay profile with extremely small absorbance around 0.01 of transient such as the excited triplet state of metalloporphyrins was precisely observed by the double beam method.

Affiliations: 1: Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, I-I Minami-ohsawa, Hachiohji city, Tokyo 192-03, Japan


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