Photoelectron spectroscopy using microjets is a tool to interrogate electronic structure of solvated species, including that of the bulk solvent itself 8 . It has been applied to study various aqueous solutions, both in the UV-Vis and X-ray regimes . Because the light beam has a finite width, it ionizes both molecules in the microjets and gaseous molecules around it, giving rise to the spectra containing two well-separated features-a narrow gasphase peak and a broader band corresponding to the liquid. Superficially, these experiments appear to be a straightforward extension of the gas-phase photoelectron experiments in which the ionization energy (IE) is given by the difference between the energy of the photon (hν) and a measured kinetic energy (KE) of the ejected electrons: