Abstract
The effect of ice adsorption on the electronic structure of hydrophobic methyl-terminated Si(111) surface was studied by C 1s X-ray absorption spectroscopy. The transition to the LUMO orbital of the methyl group is symmetry-forbidden according to the dipole selection rule, which governs the X-ray absorption process. Upon ice adsorption, the LUMO peak intensity is enhanced dramatically, indicating that the ice layers directly perturb the excited state orbitals of the methyl groups, increasing the asymmetric character. This is unexpected since the hydrophobic nature of the surface is confirmed by the three-dimensional growth of ice layers. We propose that the interaction between the hydrophobic methyl surface and adsorbed ice results in the formation of weak hydrogen bonds.
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