Abstract
Pyrazine (C 4N 2H 4) is probably adsorbed with the molecular plane parallel to the Ag(111) surface, because π−π ∗ transitions measured by electron energy loss spectroscopy (EELS) are screened. The inverse and direct photoemission spectra are discussed within the framework of dipolar selection rules. A strong affinity level of pyrazine 2.6 eV above the Fermi level is tentatively assigned to b 3u(π ∗). The tentative assignment of the photoemission spectra implies a relaxation of about 1.1 eV.
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