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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/16073

Title: Sum frequency generation spectroscopy study of hydrogenated stepped Si(111) surfaces made by molecular hydrogen exposure
Authors: Hien, K.T.T.
Sattar, M.A.
Miyauchi, Y.
Mizutani, G.
Rutt, H.N.
Keywords: Sum frequency generation
vibration
hydrogen dosing
wet chemical etching
Issue Date: 2017-04-21
Publisher: Elsevier
Magazine name: Surface Science
Volume: 663
Start page: 11
End page: 15
DOI: 10.1016/j.susc.2017.04.007
Abstract: Hydrogen adsorption on stepped Si(111) surfaces 9.5°miscut in the [1^̅1^̅2] direction has been investigated in situ in a UHV chamber with a base pressure of ~10^<-8> Pa. The H-Si(111)1x1 surface was prepared by exposing the wafer to ultra-pure hydrogen gas at a pressure of ~470 Pa. Termination of hydrogen on terraces and steps was observed by sum frequency generation (SFG) with several polarization combinations such as ppp, ssp, pps, spp, psp, sps, pss and sss. Here the 1st, 2nd and 3rd symbols indicate SFG, visible and IR polarizations, respectively. ppp and ssp-SFG clearly showed only two modes: the Si-H stretching vibration terrace mode at 2082 cm^<-1> (A) and the vertical step dihydride vibration mode at 2094 cm^<-1> (C_1). Interesting points are the appearance of the C_1 mode in contrast to the previous SFG spectrum of the H-Si(111)1x1 surface with the same miscut surface angle prepared by wet chemical etching. We suggest that the formation of step dihydride and its orientation on the Si(111) stepped surfaces depend strongly on the preparation method.
Rights: Copyright (C)2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (CC BY-NC-ND 4.0). [http://creativecommons.org/licenses/by-nc-nd/4.0/] NOTICE: This is the author's version of a work accepted for publication by Elsevier. K.T.T. Hien, M.A. Sattar, Y. Miyauchi, G. Mizutani, and H.N. Rutt, Surface Science, 663, 2017, 11-15, http://dx.doi.org/10.1016/j.susc.2017.04.007
URI: http://hdl.handle.net/10119/16073
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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