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Abstract
Time resolved photoacoustic spectroscopy in conjunction with magnetic circular dichroism (MCD) spectroscopy has been applied to determine energies and quantum yields for the formation of triplet states in aqueous solutions of a fulvic acid ranging in pH from 2.0 to 9.5. The triplet energy is estimated as 1.7 × 102 kJ mol−1 from MCD spectra. The intersystem crossing quantum yields are 0.82 to 0.35 for the pH range 2.0 to 9.5. With triplet yields known, the overall photophysics of the fulvic acid can be described.