Surface photochemistry: 6. CH sub 3 Br on Pt(111)
The surface photochemistry of monolayer and submonolayer CH{sub 3}Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and s...
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| Veröffentlicht in: | Journal of physical chemistry (1952) 1989-11, Vol.93:22 |
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| container_title | Journal of physical chemistry (1952) |
| container_volume | 93:22 |
| creator | Liu, Z.M. Costello, S.A. Roop, B. Coon, S.R. Akhter, S. White, J.M. |
| description | The surface photochemistry of monolayer and submonolayer CH{sub 3}Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and surface temperatures near 100 K, evidence is presented for the nonthermal cleavage of the C-Br bond and the formation of adsorbed Br atoms and CH{sub 3} groups. The wavelength dependent is strong and red-shifted compared to the gas-phase electronic excitation spectrum of CH{sub 3}Br. By quantitative XPS, the maximum photolysis yield of retained Br from one monolayer of CH{sub 3}Br is 60 {plus minus} 5%. While there is some slow thermal desorption, there is no detectable photodesorption of the parent during irradiation. Excitation mechanisms and product formation channels are discussed. |
| doi_str_mv | 10.1021/j100359a030 |
| format | Article |
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CH sub 3 Br on Pt(111)</title><source>American Chemical Society Journals</source><creator>Liu, Z.M. ; Costello, S.A. ; Roop, B. ; Coon, S.R. ; Akhter, S. ; White, J.M.</creator><creatorcontrib>Liu, Z.M. ; Costello, S.A. ; Roop, B. ; Coon, S.R. ; Akhter, S. ; White, J.M.</creatorcontrib><description>The surface photochemistry of monolayer and submonolayer CH{sub 3}Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and surface temperatures near 100 K, evidence is presented for the nonthermal cleavage of the C-Br bond and the formation of adsorbed Br atoms and CH{sub 3} groups. The wavelength dependent is strong and red-shifted compared to the gas-phase electronic excitation spectrum of CH{sub 3}Br. By quantitative XPS, the maximum photolysis yield of retained Br from one monolayer of CH{sub 3}Br is 60 {plus minus} 5%. While there is some slow thermal desorption, there is no detectable photodesorption of the parent during irradiation. Excitation mechanisms and product formation channels are discussed.</description><identifier>ISSN: 0022-3654</identifier><identifier>EISSN: 1541-5740</identifier><identifier>DOI: 10.1021/j100359a030</identifier><language>eng</language><publisher>United States</publisher><subject>360104 -- Metals & Alloys-- Physical Properties ; BROMINATED ALIPHATIC HYDROCARBONS ; CHEMISTRY ; DATA ; DATA ANALYSIS ; ELEMENTS ; EXPERIMENTAL DATA ; HALOGENATED ALIPHATIC HYDROCARBONS ; INFORMATION ; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ; MATERIALS SCIENCE ; MEASURING INSTRUMENTS ; MEASURING METHODS ; METALS ; METHYL BROMIDE ; NUMERICAL DATA ; ORGANIC BROMINE COMPOUNDS ; ORGANIC COMPOUNDS ; ORGANIC HALOGEN COMPOUNDS ; PHOTOCHEMISTRY ; PLATINUM ; PLATINUM METALS ; SPECTROSCOPY ; SURFACE PROPERTIES ; TRANSITION ELEMENTS 400201 -- Chemical & Physicochemical Properties ; X-RAY SPECTROSCOPY</subject><ispartof>Journal of physical chemistry (1952), 1989-11, Vol.93:22</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/6735891$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Liu, Z.M.</creatorcontrib><creatorcontrib>Costello, S.A.</creatorcontrib><creatorcontrib>Roop, B.</creatorcontrib><creatorcontrib>Coon, S.R.</creatorcontrib><creatorcontrib>Akhter, S.</creatorcontrib><creatorcontrib>White, J.M.</creatorcontrib><title>Surface photochemistry: 6. CH sub 3 Br on Pt(111)</title><title>Journal of physical chemistry (1952)</title><description>The surface photochemistry of monolayer and submonolayer CH{sub 3}Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and surface temperatures near 100 K, evidence is presented for the nonthermal cleavage of the C-Br bond and the formation of adsorbed Br atoms and CH{sub 3} groups. The wavelength dependent is strong and red-shifted compared to the gas-phase electronic excitation spectrum of CH{sub 3}Br. By quantitative XPS, the maximum photolysis yield of retained Br from one monolayer of CH{sub 3}Br is 60 {plus minus} 5%. While there is some slow thermal desorption, there is no detectable photodesorption of the parent during irradiation. Excitation mechanisms and product formation channels are discussed.</description><subject>360104 -- Metals & Alloys-- Physical Properties</subject><subject>BROMINATED ALIPHATIC HYDROCARBONS</subject><subject>CHEMISTRY</subject><subject>DATA</subject><subject>DATA ANALYSIS</subject><subject>ELEMENTS</subject><subject>EXPERIMENTAL DATA</subject><subject>HALOGENATED ALIPHATIC HYDROCARBONS</subject><subject>INFORMATION</subject><subject>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</subject><subject>MATERIALS SCIENCE</subject><subject>MEASURING INSTRUMENTS</subject><subject>MEASURING METHODS</subject><subject>METALS</subject><subject>METHYL BROMIDE</subject><subject>NUMERICAL DATA</subject><subject>ORGANIC BROMINE COMPOUNDS</subject><subject>ORGANIC COMPOUNDS</subject><subject>ORGANIC HALOGEN COMPOUNDS</subject><subject>PHOTOCHEMISTRY</subject><subject>PLATINUM</subject><subject>PLATINUM METALS</subject><subject>SPECTROSCOPY</subject><subject>SURFACE PROPERTIES</subject><subject>TRANSITION ELEMENTS 400201 -- Chemical & Physicochemical Properties</subject><subject>X-RAY SPECTROSCOPY</subject><issn>0022-3654</issn><issn>1541-5740</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1989</creationdate><recordtype>article</recordtype><recordid>eNqNyjsOgkAQANCJ0UT8VF5gYqUFOMOwoJYaDaWJ9gQ3S4Aoa9i18PY2HsDqNQ9gwRQxxbxpmUjUriShAQSsEg5VltAQAqI4DiVVyRgmzrVExCIcAF_ffVVqg6_aeqtr82yc7z97TCM85ujedxQ89Gg7vPgVM69nMKrKhzPzn1NYnk-3Yx5a55vC6cYbXWvbdUb7Is1EbXcsf6UvEVY2EA</recordid><startdate>19891102</startdate><enddate>19891102</enddate><creator>Liu, Z.M.</creator><creator>Costello, S.A.</creator><creator>Roop, B.</creator><creator>Coon, S.R.</creator><creator>Akhter, S.</creator><creator>White, J.M.</creator><scope>OTOTI</scope></search><sort><creationdate>19891102</creationdate><title>Surface photochemistry: 6. CH sub 3 Br on Pt(111)</title><author>Liu, Z.M. ; Costello, S.A. ; Roop, B. ; Coon, S.R. ; Akhter, S. ; White, J.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_67358913</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1989</creationdate><topic>360104 -- Metals & Alloys-- Physical Properties</topic><topic>BROMINATED ALIPHATIC HYDROCARBONS</topic><topic>CHEMISTRY</topic><topic>DATA</topic><topic>DATA ANALYSIS</topic><topic>ELEMENTS</topic><topic>EXPERIMENTAL DATA</topic><topic>HALOGENATED ALIPHATIC HYDROCARBONS</topic><topic>INFORMATION</topic><topic>INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY</topic><topic>MATERIALS SCIENCE</topic><topic>MEASURING INSTRUMENTS</topic><topic>MEASURING METHODS</topic><topic>METALS</topic><topic>METHYL BROMIDE</topic><topic>NUMERICAL DATA</topic><topic>ORGANIC BROMINE COMPOUNDS</topic><topic>ORGANIC COMPOUNDS</topic><topic>ORGANIC HALOGEN COMPOUNDS</topic><topic>PHOTOCHEMISTRY</topic><topic>PLATINUM</topic><topic>PLATINUM METALS</topic><topic>SPECTROSCOPY</topic><topic>SURFACE PROPERTIES</topic><topic>TRANSITION ELEMENTS 400201 -- Chemical & Physicochemical Properties</topic><topic>X-RAY SPECTROSCOPY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liu, Z.M.</creatorcontrib><creatorcontrib>Costello, S.A.</creatorcontrib><creatorcontrib>Roop, B.</creatorcontrib><creatorcontrib>Coon, S.R.</creatorcontrib><creatorcontrib>Akhter, S.</creatorcontrib><creatorcontrib>White, J.M.</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Journal of physical chemistry (1952)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Liu, Z.M.</au><au>Costello, S.A.</au><au>Roop, B.</au><au>Coon, S.R.</au><au>Akhter, S.</au><au>White, J.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Surface photochemistry: 6. CH sub 3 Br on Pt(111)</atitle><jtitle>Journal of physical chemistry (1952)</jtitle><date>1989-11-02</date><risdate>1989</risdate><volume>93:22</volume><issn>0022-3654</issn><eissn>1541-5740</eissn><abstract>The surface photochemistry of monolayer and submonolayer CH{sub 3}Br on Pt(111) has been studied by temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) to diagnose the results of continuous low-intensity ultraviolet irradiation. For wavelengths of 300 nm or less, and surface temperatures near 100 K, evidence is presented for the nonthermal cleavage of the C-Br bond and the formation of adsorbed Br atoms and CH{sub 3} groups. The wavelength dependent is strong and red-shifted compared to the gas-phase electronic excitation spectrum of CH{sub 3}Br. By quantitative XPS, the maximum photolysis yield of retained Br from one monolayer of CH{sub 3}Br is 60 {plus minus} 5%. While there is some slow thermal desorption, there is no detectable photodesorption of the parent during irradiation. Excitation mechanisms and product formation channels are discussed.</abstract><cop>United States</cop><doi>10.1021/j100359a030</doi></addata></record> |
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| ispartof | Journal of physical chemistry (1952), 1989-11, Vol.93:22 |
| issn | 0022-3654 1541-5740 |
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| source | American Chemical Society Journals |
| subjects | 360104 -- Metals & Alloys-- Physical Properties BROMINATED ALIPHATIC HYDROCARBONS CHEMISTRY DATA DATA ANALYSIS ELEMENTS EXPERIMENTAL DATA HALOGENATED ALIPHATIC HYDROCARBONS INFORMATION INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY MATERIALS SCIENCE MEASURING INSTRUMENTS MEASURING METHODS METALS METHYL BROMIDE NUMERICAL DATA ORGANIC BROMINE COMPOUNDS ORGANIC COMPOUNDS ORGANIC HALOGEN COMPOUNDS PHOTOCHEMISTRY PLATINUM PLATINUM METALS SPECTROSCOPY SURFACE PROPERTIES TRANSITION ELEMENTS 400201 -- Chemical & Physicochemical Properties X-RAY SPECTROSCOPY |
| title | Surface photochemistry: 6. CH sub 3 Br on Pt(111) |
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