Abstract
The flash photolysis EPR spectra of benzophenone (BP) in alcoholic solvents differ in terms of their chemically induced dynamic electron polarization (CIDEP) signatures when BP is photo-excited at different laser wavelengths. The difference is strongly dependent upon the concentration of BP and is attributed to the reaction of two BP triplet states to form a BP radical anion, BP radical cation pair which occurs on a timescale sufficiently rapid relative to relaxation in the BP triplet to transfer polarization into the resulting radicals. This polarized signal dominates the spectrum obtained by 266 nm photo-excitation due to the much larger extinction coefficient of BP at this wavelength.
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