Elsevier

Surface Science

Volume 394, Issues 1–3, 19 December 1997, Pages L138-L144
Surface Science

Surface science letter
Observation of a novel high density 3O(2 × 2) structure on Ru(001)

https://doi.org/10.1016/S0039-6028(97)00787-5Get rights and content

Abstract

High-resolution electron energy loss spectroscopy and scanning tunneling microscopy have been applied to identify and characterize a novel high density phase of oxygen adsorbed on Ru(001). Three oxygen atoms per (2 × 2) unit cell are arranged such that a (2 × 2) vacancy superstructure is formed. Atomically resolved STM images clearly establish the existence of such a phase. The ordered layer is characterized by a sharp (2 × 2) superstructure as seen by low energy electron diffraction. Two dipole active energy losses were found for the 3O(2 × 2) layer at 0.75 ML and interpreted as the in-phase oxygen to metal stretching vibration and the totally symmetric eigenmode consisting of frustrated translations of three next-neighbor oxygen atoms towards each other. The vibrational modes of this novel structure are compared to data for oxygen coverages in the range 0.5–1 ML.

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    In the mid-90s, theory predicted two additional ordered O-phases on Ru(0001) [102], namely the (2 × 2)-3O and the (1 × 1)-O phase, which subsequently have been confirmed by experiments. Dosing more than 1000 L of O2 or high exposures of NO2 (100 L) at surface temperatures of about 550 K the Ru(0001) surface was shown to stabilize the (2 × 2)-3O [103,104] and the (1 × 1)-O [105] surface phases of chemisorbed O with coverages of 0.75 and 1.0 ML, respectively. The dissociative sticking coefficient of molecular oxygen over the Ru(0001)-(1 × 1)-O surface was estimated to be less than 10− 6 [106].

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Permanent address: Inst. of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria.

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