Real-time measurement of the vertical binding energy during the birth of a solvated electron

J Am Chem Soc. 2015 Mar 18;137(10):3520-4. doi: 10.1021/ja511571y. Epub 2015 Jan 30.


Using femtosecond time-resolved two-photon photoelectron spectroscopy, we determine (i) the vertical binding energy (VBE = 0.8 eV) of electrons in the conduction band in supported amorphous solid water (ASW) layers, (ii) the time scale of ultrafast trapping at pre-existing sites (22 fs), and (iii) the initial VBE (1.4 eV) of solvated electrons before significant molecular reorganization sets in. Our results suggest that the excess electron dynamics prior to solvation are representative for bulk ASW.