Abstract
The electronic structure ofPd(110)c(4 × 2)-benzene near the Fermi level ( E F ) was studied by photoemission spectroscopy (PES), metastable atom electron spectroscopy (MAES) and scanning tunneling microscopy (STM). Observed STM images of adsorbed benzene near E F consist of two elongated protrusions separated by a single nodal depression with C 2 symmetry. The benzene derived state near E F is newly observed by means of MAES, and it is assigned to the antibonding state hybridized between the 1e 1g molecular orbital of benzene and the Pd 4d orbitals from ab initio molecular orbital calculation. This state mainly contributes to the characteristic STM images. We conclude that thec(4 × 2)-benzene molecules are flat-lying and azimuthally rotated.
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