The role of intramolecular scattering in K-shell photoionization

摘要

We report evidence of intramolecular scattering occurring in inner shell photoionization of small molecules. Pronounced oscillations of the ratios between vibrationally resolved cross sections (v-ratios) as a function of photon energy have been observed theoretically and experimentally. Qualitative agreement with a 1~(st) Born model confirms that they are due to intramolecular scattering: when an electron is ejected from a very localized region in the center of a polyatomic molecule, such as the C(ls) orbital in a CF_4 molecule, it is diffracted by the surrounding atomic centers, encoding the geometry of the molecule [1,2].