Photoemission studies of adenine microcrystals in the presence of traces of water yield two distinct values of the ionization energy, Ic=6.2 and 7.1 eV, each of which has been observed separately in different laboratories. We ascribe these results respectively to photoemission from "wet" and "dry" sites on the crystal surface. The 0.9 eV lowering of Ic is attributed to the solvation of the pre-ionizing state. The solvation energy must be in place before the electron leaves and it is argued that the photoemission event takes about 5×10-13 s.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry