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We investigate the chemical and structural configuration of acetophenone onSi(001) using synchrotron radiation core-level spectroscopy techniques anddensity functional theory calculations. Samples were prepared by vapour phasedosing of clean Si(001) surfaces with acetophenone in ultrahigh vacuum. Nearedge X-ray adsorption fine structure spectroscopy and photoelectronspectroscopy measurements were made at room temperature as a function ofcoverage density and post-deposition anneal temperature. We show that thedominant room temperature adsorption structure lies flat on the substrate,while moderate thermal annealing induces the breaking of Si-C bonds between thephenyl ring and the surface resulting in the reorientation of the adsorbateinto an upright configuration.

Manipulating the orientation of an organic adsorbate on silicon: a NEXAFS study of acetophenone on Si(001)