Premium
THE TRIPLET STATE OF 8‐METHOXYPSORALEN
Author(s) -
Sloper R. W.,
Truscott T. G.,
Land E. J.
Publication year - 1979
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1979.tb07808.x
Subject(s) - flash photolysis , chemistry , ultrafast laser spectroscopy , photochemistry , photoionization , triplet state , absorption spectroscopy , solvated electron , ion , absorption (acoustics) , spectral line , ground state , aqueous solution , analytical chemistry (journal) , laser , atomic physics , radiolysis , ionization , kinetics , reaction rate constant , molecule , physics , organic chemistry , optics , quantum mechanics , astronomy
— Transient absorption spectra produced by laser flash photolysis of an aqueous solution of 8‐methoxypsoralen (8‐MOP) have been studied. The biphotonic production of hydrated electrons and of the radical ions, 8‐MOP + and 8‐MOP ‐ is reported. The hydrated electron was found to react with ground state 8‐MOP with k ˜ 3 × 10 10 M ‐1 s ‐1 . In order to obtain a true triplet‐triplet absorption spectrum. contributions from the radical ions were subtracted from the overall transient absorption. In addition, contributions from e ‐ aq to the transient spectrum were removed by using N 2 O, low laser intensity to minimize photoionization or by measuring the transient O.D. after the electron has decayed. These three methods each produced the same triplet‐triplet spectrum which differs in the red region from previously reported spectra.