The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS

The adsorption of methyl radicals on two different oxygen-modified Mo(100) surfaces at room temperature has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Previous experiments have shown that methyl radicals adsorbed to these...

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Veröffentlicht in:	Surface science 1997-02, Vol.372 (1), p.185-192
Hauptverfasser:	Parker, B.R., Jenkins, J.F., Stair, P.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alkanes Applied sciences Chemistry Electron energy loss spectroscopy Exact sciences and technology General and physical chemistry Metals. Metallurgy Molybdenum Single crystal surfaces Solid-gas interface Surface chemical reaction Surface physical chemistry
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creator	Parker, B.R. Jenkins, J.F. Stair, P.C.
description	The adsorption of methyl radicals on two different oxygen-modified Mo(100) surfaces at room temperature has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH 4, H 2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 bdK. Methyl groups dehydrogenate at room temperature and reveal an OH stretching vibration as well as the CH 2 scissor mode. This data is compared to the results observed when CH 3OH is adsorbed on the same surface. In the latter case, no OH vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.
doi_str_mv	10.1016/S0039-6028(96)01118-1
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Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH 4, H 2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 bdK. Methyl groups dehydrogenate at room temperature and reveal an OH stretching vibration as well as the CH 2 scissor mode. This data is compared to the results observed when CH 3OH is adsorbed on the same surface. In the latter case, no OH vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.</description><identifier>ISSN: 0039-6028</identifier><identifier>EISSN: 1879-2758</identifier><identifier>DOI: 10.1016/S0039-6028(96)01118-1</identifier><identifier>CODEN: SUSCAS</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Alkanes ; Applied sciences ; Chemistry ; Electron energy loss spectroscopy ; Exact sciences and technology ; General and physical chemistry ; Metals. 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Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH 4, H 2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 bdK. Methyl groups dehydrogenate at room temperature and reveal an OH stretching vibration as well as the CH 2 scissor mode. This data is compared to the results observed when CH 3OH is adsorbed on the same surface. In the latter case, no OH vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.</description><subject>Alkanes</subject><subject>Applied sciences</subject><subject>Chemistry</subject><subject>Electron energy loss spectroscopy</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Metals. 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Metallurgy</topic><topic>Molybdenum</topic><topic>Single crystal surfaces</topic><topic>Solid-gas interface</topic><topic>Surface chemical reaction</topic><topic>Surface physical chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Parker, B.R.</creatorcontrib><creatorcontrib>Jenkins, J.F.</creatorcontrib><creatorcontrib>Stair, P.C.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Surface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Parker, B.R.</au><au>Jenkins, J.F.</au><au>Stair, P.C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS</atitle><jtitle>Surface science</jtitle><date>1997-02-10</date><risdate>1997</risdate><volume>372</volume><issue>1</issue><spage>185</spage><epage>192</epage><pages>185-192</pages><issn>0039-6028</issn><eissn>1879-2758</eissn><coden>SUSCAS</coden><abstract>The adsorption of methyl radicals on two different oxygen-modified Mo(100) surfaces at room temperature has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH 4, H 2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 bdK. Methyl groups dehydrogenate at room temperature and reveal an OH stretching vibration as well as the CH 2 scissor mode. This data is compared to the results observed when CH 3OH is adsorbed on the same surface. In the latter case, no OH vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.</abstract><cop>Lausanne</cop><cop>Amsterdam</cop><cop>New York, NY</cop><pub>Elsevier B.V</pub><doi>10.1016/S0039-6028(96)01118-1</doi><tpages>8</tpages></addata></record>
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subjects	Alkanes Applied sciences Chemistry Electron energy loss spectroscopy Exact sciences and technology General and physical chemistry Metals. Metallurgy Molybdenum Single crystal surfaces Solid-gas interface Surface chemical reaction Surface physical chemistry
title	The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS
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