Abstract

We present the fourth-order Raman spectrum of an organic adsorbate on a solid surface. TiO 2(1 1 0) surfaces covered by p-nitrobenzoate ( pNB) and trimethyl acetate were observed. In addition to phonon modes of TiO 2, a weak band at 572 cm −1 was observed for the surface covered by pNB, and assigned as a molecular vibration. The coverage of pNB was estimated to be 13% using XPS. The feasibility of fourth-order Raman spectroscopy is demonstrated in observing organic adsorbates of submonolayer quantity.

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