We have performed high resolution measurements of the photoelectrons emitted from the valence shell of
C60 and C70, in the gas phase and adsorbed phase on a metal surface, in order to derive branching ratios and
the partial photoionization cross sections of the two highest occupied molecular orbitals, HOMO and HOMO-
1. The comparison between the gas phase and the adsorbed phase shows an interesting and unexpected
difference that can be attributed to a small orbital shift in solid C70. Density Functional Theory calculations
within the Local Density Approximation (LDA) show good agreement for both data sets and give a plausible
explanation for the observed difference
