A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100)
Chlorine adsorption on (1 × 1)-Cr(100) has been studied using AES, UPS, XPS, LEED, TDS and Δφ measurements. For gas exposures of <8.0 × 1018 molecules m-2. Cl2 adsorbs dissociatively with high sticking probability into an atomic overlayer. Continuous compression of an initial c(2 × 2) phase o...
| المؤلفون الرئيسيون: | , |
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| التنسيق: | Journal article |
| اللغة: | English |
| منشور في: |
1982
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| _version_ | 1826302530064220160 |
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| author | Foord, J Lambert, R |
| author_facet | Foord, J Lambert, R |
| author_sort | Foord, J |
| collection | OXFORD |
| description | Chlorine adsorption on (1 × 1)-Cr(100) has been studied using AES, UPS, XPS, LEED, TDS and Δφ measurements. For gas exposures of <8.0 × 1018 molecules m-2. Cl2 adsorbs dissociatively with high sticking probability into an atomic overlayer. Continuous compression of an initial c(2 × 2) phase occurs as coverage increases, until a p(2 × 5) structure is formed with a ClCl nearest neighbour separation of 3.41 Å. In this coverage regime a single adsorbate induced band appears at -6.0 eV in UPS and the Cr(2p) and Cl(2p) binding energies remain constant in XPS. Thermal desorption occurs as CrCl, and the TD spectra exhibit a single peak which corresponds to an activation energy of 300-340 kJ mol-1. After higher gas exposures, chemical shifts in XPS and the appearance of additional bands in UPS reveal that epitaxial growth of chromium dichloride occurs. This halide phase has a twinned layer structure; it desorbs as CrCl2 with an activation energy of ∼240 kJ mol-1. The system now exhibits three-dimensional island growth, and the rate of corrosion of the chromium substrate is shown to be ∼0.02 that of overlayer formation. © 1982. |
| first_indexed | 2024-03-07T05:48:57Z |
| format | Journal article |
| id | oxford-uuid:e82d8e70-f7ed-4200-a3db-7a2fe835b0d1 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:48:57Z |
| publishDate | 1982 |
| record_format | dspace |
| spelling | oxford-uuid:e82d8e70-f7ed-4200-a3db-7a2fe835b0d12022-03-27T10:44:44ZA STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e82d8e70-f7ed-4200-a3db-7a2fe835b0d1EnglishSymplectic Elements at Oxford1982Foord, JLambert, RChlorine adsorption on (1 × 1)-Cr(100) has been studied using AES, UPS, XPS, LEED, TDS and Δφ measurements. For gas exposures of <8.0 × 1018 molecules m-2. Cl2 adsorbs dissociatively with high sticking probability into an atomic overlayer. Continuous compression of an initial c(2 × 2) phase occurs as coverage increases, until a p(2 × 5) structure is formed with a ClCl nearest neighbour separation of 3.41 Å. In this coverage regime a single adsorbate induced band appears at -6.0 eV in UPS and the Cr(2p) and Cl(2p) binding energies remain constant in XPS. Thermal desorption occurs as CrCl, and the TD spectra exhibit a single peak which corresponds to an activation energy of 300-340 kJ mol-1. After higher gas exposures, chemical shifts in XPS and the appearance of additional bands in UPS reveal that epitaxial growth of chromium dichloride occurs. This halide phase has a twinned layer structure; it desorbs as CrCl2 with an activation energy of ∼240 kJ mol-1. The system now exhibits three-dimensional island growth, and the rate of corrosion of the chromium substrate is shown to be ∼0.02 that of overlayer formation. © 1982. |
| spellingShingle | Foord, J Lambert, R A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title | A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title_full | A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title_fullStr | A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title_full_unstemmed | A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title_short | A STRUCTURAL AND KINETIC-STUDY OF CHLORINE CHEMISORPTION AND SURFACE CHLORIDE FORMATION ON CR(100) |
| title_sort | structural and kinetic study of chlorine chemisorption and surface chloride formation on cr 100 |
| work_keys_str_mv | AT foordj astructuralandkineticstudyofchlorinechemisorptionandsurfacechlorideformationoncr100 AT lambertr astructuralandkineticstudyofchlorinechemisorptionandsurfacechlorideformationoncr100 AT foordj structuralandkineticstudyofchlorinechemisorptionandsurfacechlorideformationoncr100 AT lambertr structuralandkineticstudyofchlorinechemisorptionandsurfacechlorideformationoncr100 |