Abstract
Penning ionization of dibenzenechromium with He*(23S) metastable atoms was observed by collision-energy-resolved two-dimensional electron spectroscopy. Collision energy dependence of partial ionization cross sections (CEDPICS) indicates that attractive interaction around the benzene rings (Bz) results in negative slope of CEDPICS for ionization from valence πBz orbtials. Negative CEDPICS of bands 1 and 2 was ascribed to strong electron correlation effects in mixing configurations of direct ionization from metal d orbitals and shake-up excitation as shown by CI calculation. Repulsive interaction was also found around the sCH bonds and the Cr atom.
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