Low energy helium diffraction studies of CH3Br overlayers physisorbed on C(0001), NaCl(001), and LiF(001) surfaces
| العنوان: | Low energy helium diffraction studies of CH3Br overlayers physisorbed on C(0001), NaCl(001), and LiF(001) surfaces |
|---|---|
| المؤلفون: | Gary N. Robinson, Gang-yu Liu, N. Camillone, Paul A. Rowntree, Giacinto Scoles, Jia Wang |
| المصدر: | The Journal of Chemical Physics. 96:9212-9220 |
| بيانات النشر: | AIP Publishing, 1992. |
| سنة النشر: | 1992 |
| مصطلحات موضوعية: | Diffraction, chemistry.chemical_classification, Chemistry, Analytical chemistry, General Physics and Astronomy, Mineralogy, chemistry.chemical_element, Overlayer, Dipole, Physisorption, Lattice (order), Molecule, Physical and Theoretical Chemistry, Inorganic compound, Helium |
| الوصف: | Low energy helium diffraction has been used to determine the unit mesh parameters of overlayers of CH3Br physisorbed on C(0001), NaCl(001), and LiF(001) at ≊35 K. CH3Br forms a uniaxially commensurate overlayer on C(0001) with unit mesh parameters 4.26 A×6.75 A. On NaCl(001), CH3Br forms a high coverage and a low coverage phase. The high coverage phase is incommensurate and has unit mesh parameters 4.54 A×6.73 A, whereas the low coverage phase is commensurate with a ((2)1/2×3(2)1/2)R45° unit mesh. The structure of CH3Br/LiF(001) is essentially the same as that of the high coverage phase of CH3Br/NaCl(001) with unit mesh parameters 4.52 A×6.71 A. The unit mesh parameters (with the exception of low coverage CH3Br/NaCl ) are very similar to the lattice parameters of the a‐b [or (001)] plane of bulk crystalline CH3Br at ≊153 K. By analogy with the bulk crystal, it is likely that there are two molecules per unit mesh and that the CH3Br dipoles are nearly perpendicular to the surface and antiferroelectrically o... |
| تدمد: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.462231 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::38cddea726129fbaa2f1d56f50a3f566 https://doi.org/10.1063/1.462231 |
| رقم الانضمام: | edsair.doi...........38cddea726129fbaa2f1d56f50a3f566 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10897690 00219606 |
|---|---|
| DOI: | 10.1063/1.462231 |