Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9595775 | Surface Science | 2005 | 9 Pages |
Abstract
Using high resolution electron energy loss spectroscopy (HREELS), we have characterized the fingerprint spectra of clean, hydrogenated, methanol-dosed and air-exposed n-doped Ge(1Â 0Â 0). On clean Ge(1Â 0Â 0) 2Â ÃÂ 1, we report the observation of a surface phonon peak between â¼28-35Â meV. The position and shape of this peak is sensitive to the presence of low surface coverage of hydrogen and oxygen. By adsorbing molecular hydrogen on the n-doped Ge, this peak shifts towards the elastic peak, and becomes attenuated. The HREELS fingerprint spectrum of air-exposed Ge is similar to that created by dosing Ge with methanol. Methanol undergoes dissociation into methyl radicals and hydroxyl species on Ge surfaces at room temperature and oxidizes the Ge surface readily.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Chee Wei Lim, Jia Mei Soon, Ngai Ling Ma, Wei Chen, Kian Ping Loh,