Deciphering Photoacidity by Following Electronic Charge Distribution Changes along the Photoacid Förster Cycle with Time-Resolved Nitrogen K-Edge X-Ray Absorption Spectroscopy

We locally probe with picosecond N K-edge spectroscopy electronic structure changes along all stages of the Forster photocycle of a prototypical photoacid, and determine how photoacid behaviour is driven by the conjugate photobase side.