Abstract
Photon stimulated ion desorption of methyl ester terminated self-assembled monolayer induced by carbon core excitation was examined mainly using Auger electron–photoion coincidence (AEPICO) spectroscopy. The CH n + ( n=1–3) ion desorption is selectively observed at the excitation of carbon 1s to σ ∗ (O–CH 3) anti-bonding orbital. AEPICO yield spectra at this resonant excitation showed CH 3 + and CH 2 + ion desorption are drastically enhanced at specific Auger electron energy. This enhancement is related to spectator Auger transition whose final state is that one electron is in an O–C anti-bonding orbital and two holes in O–C bonding orbitals. The results were compared with PMMA polymer thin film, which has the same methyl ester group at the side chain.
Published Version
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