Abstract
Nanosecond laser flash photolysis (XeCl, 308 nm), optical spectroscopy, fluorescence, and time-resolved chemically induced nuclear polarization (CIDNP) were used to determine photophysical and photochemical processes for 5-sulfosalicylic acid dianion (HSSA 2−) in aqueous solutions and frozen matrices. The triplet–triplet absorption (TTA) band with a maximum at 470 nm was recorded under excitation in the region of the long-wave absorption band of dianion ( λ max=300 nm). For high laser pulse intensities, a two-quantum formation of an aquated electron is observed. CIDNP in solutions and flash photolysis in frozen matrices, with preliminary excitation to populate T 1 state, indicate that photoionization occurs during absorption of a second quantum by an excited singlet S 1 state. The spectral and kinetic characteristics of the excited states of dianion and aquated electron were determined.
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Schedule a callMore From: Journal of Photochemistry and Photobiology A: Chemistry
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