Abstract
Contribution of nuclear reaction analysis to studies of gas adsorption on surfaces comes from their ability to measure adsorbate concentrations lower than one monolayer with high accuracy. Study of hydrogen analysis by {sup 1}H({sup 15}N, {alpha}{gamma}){sup 12}C reaction has allowed to define the analytical characteristics of these methods. Deuterium analysis by {sup 2}D({sup 15}N, p{gamma}{sup 16}N and {sup 2}D({sup 15}N, n{gamma}){sup 16}O reactions has allowed a study of coadsorption of benzene and H using D-labelled molecules, the carbon concentration being determined from the {sup 12}C(d, p{sub 0}){sup 13}C and {sup 13}C(p, {gamma}){sup 14}N reactions. The nuclear reaction on H has been firstly applied to the measurement of room temperature H coverage of Ni (111). The maximum surface coverage of 0.6 ({+-} 0.05) monolayer is in good agreement with previously published values. Then, H adsorption on (111) and (110) faces of Pt{sub 50} Ni{sub 50} alloy has been studied at 115 to 400 K and 10{sup -8} to 10{sup -4} mbar. H coverage at saturation, obtained for low temperature adsorption, is 0.92 ({+-} 0.1) monolayer on (110) face and 0.18 ({+-} 0.04) monolayer on (111) face. These values are notably lower than saturation coverages of Ni and Pt single crystals. For
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Citation Formats
Benmansour, M.
Application of nuclear reaction analysis to the study of hydrogen and benzene adsorption on monocrystals of nickel and of the alloy Pt{sub 50}Ni{sub 50}; Application de l`analyse par reactions nucleaires a l`etude de l`adsorption de l`hydrogene et du benzene sur des monocristaux de nickel et d`alliage Pt{sub 50}Ni{sub 50}.
France: N. p.,
1992.
Web.
Benmansour, M.
Application of nuclear reaction analysis to the study of hydrogen and benzene adsorption on monocrystals of nickel and of the alloy Pt{sub 50}Ni{sub 50}; Application de l`analyse par reactions nucleaires a l`etude de l`adsorption de l`hydrogene et du benzene sur des monocristaux de nickel et d`alliage Pt{sub 50}Ni{sub 50}.
France.
Benmansour, M.
1992.
"Application of nuclear reaction analysis to the study of hydrogen and benzene adsorption on monocrystals of nickel and of the alloy Pt{sub 50}Ni{sub 50}; Application de l`analyse par reactions nucleaires a l`etude de l`adsorption de l`hydrogene et du benzene sur des monocristaux de nickel et d`alliage Pt{sub 50}Ni{sub 50}."
France.
@misc{etde_10123789,
title = {Application of nuclear reaction analysis to the study of hydrogen and benzene adsorption on monocrystals of nickel and of the alloy Pt{sub 50}Ni{sub 50}; Application de l`analyse par reactions nucleaires a l`etude de l`adsorption de l`hydrogene et du benzene sur des monocristaux de nickel et d`alliage Pt{sub 50}Ni{sub 50}}
author = {Benmansour, M}
abstractNote = {Contribution of nuclear reaction analysis to studies of gas adsorption on surfaces comes from their ability to measure adsorbate concentrations lower than one monolayer with high accuracy. Study of hydrogen analysis by {sup 1}H({sup 15}N, {alpha}{gamma}){sup 12}C reaction has allowed to define the analytical characteristics of these methods. Deuterium analysis by {sup 2}D({sup 15}N, p{gamma}{sup 16}N and {sup 2}D({sup 15}N, n{gamma}){sup 16}O reactions has allowed a study of coadsorption of benzene and H using D-labelled molecules, the carbon concentration being determined from the {sup 12}C(d, p{sub 0}){sup 13}C and {sup 13}C(p, {gamma}){sup 14}N reactions. The nuclear reaction on H has been firstly applied to the measurement of room temperature H coverage of Ni (111). The maximum surface coverage of 0.6 ({+-} 0.05) monolayer is in good agreement with previously published values. Then, H adsorption on (111) and (110) faces of Pt{sub 50} Ni{sub 50} alloy has been studied at 115 to 400 K and 10{sup -8} to 10{sup -4} mbar. H coverage at saturation, obtained for low temperature adsorption, is 0.92 ({+-} 0.1) monolayer on (110) face and 0.18 ({+-} 0.04) monolayer on (111) face. These values are notably lower than saturation coverages of Ni and Pt single crystals. For (110) surface, H adsorption energy has been deduced from adsorption isobares and its variation with coverage determined. An interpretation of the results, taking into account the different segregation profiles of the metallic atoms for these two faces, is proposed. In a benzene - H coadsorption study on Ni (111), the measurement of H, D, and C concentrations on the surface was used to show the room temperature predominant surface reaction.}
place = {France}
year = {1992}
month = {Feb}
}
title = {Application of nuclear reaction analysis to the study of hydrogen and benzene adsorption on monocrystals of nickel and of the alloy Pt{sub 50}Ni{sub 50}; Application de l`analyse par reactions nucleaires a l`etude de l`adsorption de l`hydrogene et du benzene sur des monocristaux de nickel et d`alliage Pt{sub 50}Ni{sub 50}}
author = {Benmansour, M}
abstractNote = {Contribution of nuclear reaction analysis to studies of gas adsorption on surfaces comes from their ability to measure adsorbate concentrations lower than one monolayer with high accuracy. Study of hydrogen analysis by {sup 1}H({sup 15}N, {alpha}{gamma}){sup 12}C reaction has allowed to define the analytical characteristics of these methods. Deuterium analysis by {sup 2}D({sup 15}N, p{gamma}{sup 16}N and {sup 2}D({sup 15}N, n{gamma}){sup 16}O reactions has allowed a study of coadsorption of benzene and H using D-labelled molecules, the carbon concentration being determined from the {sup 12}C(d, p{sub 0}){sup 13}C and {sup 13}C(p, {gamma}){sup 14}N reactions. The nuclear reaction on H has been firstly applied to the measurement of room temperature H coverage of Ni (111). The maximum surface coverage of 0.6 ({+-} 0.05) monolayer is in good agreement with previously published values. Then, H adsorption on (111) and (110) faces of Pt{sub 50} Ni{sub 50} alloy has been studied at 115 to 400 K and 10{sup -8} to 10{sup -4} mbar. H coverage at saturation, obtained for low temperature adsorption, is 0.92 ({+-} 0.1) monolayer on (110) face and 0.18 ({+-} 0.04) monolayer on (111) face. These values are notably lower than saturation coverages of Ni and Pt single crystals. For (110) surface, H adsorption energy has been deduced from adsorption isobares and its variation with coverage determined. An interpretation of the results, taking into account the different segregation profiles of the metallic atoms for these two faces, is proposed. In a benzene - H coadsorption study on Ni (111), the measurement of H, D, and C concentrations on the surface was used to show the room temperature predominant surface reaction.}
place = {France}
year = {1992}
month = {Feb}
}