Abstract
Photoemission of holes from a platinum electrode into liquid sulfur dioxide was investigated by determining the photocurrent produced by both Ar ion and rhodamine 6G dye laser illumination (611.3 to 457.9 nm). A plot of photocurrent versus potential obeyed the ”five-halves-law“ and yielded threshold potentials that linearly correlated with excitation energy. Holes are injected from a photoexcited Pt electrode into an SO 2/tetra-η-butyl ammonium PF − 6 electrolyte solution with a threshold potential of 3.74 V versus AgREF that corresponds to an energy level of −9.1±0.1 eV versus vacuum. This level is 0.4 eV beyond the estimated level for reversible electrochemical oxidation of solvent.
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