Ultraviolet photoelectron spectroscopy of a methyl-terminated Si(1 1 1) surface

Angle-resolved ultraviolet photoelectron spectroscopy (ARUPS) of a Si(1 1 1) surface regularly terminated by methyl groups is reported. The electrochemical methylation was performed in inert atmosphere. The cleanliness and 1×1 ordering of the surface were confirmed by Auger electron spectroscopy and reflection high-energy electron diffraction, respectively. The energy band diagram has been obtained from ARUPS and each energy level was assigned from the comparison with the results of hydrogen-terminated Si(1 1 1) and quantum chemical cluster calculation.