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Do D, Do H, Nicholson D. A computer appraisal of BET theory, BET surface area and the calculation of surface excess for gas adsorption on a graphite surface. Chem Eng Sci 2010. [DOI: 10.1016/j.ces.2010.02.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hansen FY, Bruch LW. Enhanced creation of dispersive monolayer phonons in XePt(111) by inelastic helium atom scattering at low energies. J Chem Phys 2007; 127:204708. [PMID: 18052447 DOI: 10.1063/1.2786990] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Conditions likely to lead to enhanced inelastic atomic scattering that creates shear horizontal (SH) and longitudinal acoustic (LA) monolayer phonons are identified, specifically examining the inelastic scattering of (4)He atoms by a monolayer solid of XePt(111) at incident energies of 2-25 meV. There is strong inelastic scattering for both dispersive phonon branches (SH and LA) of the monolayer at incident energies below 8 meV. Several improvements enable more complete wave packet calculations of the inelastic scattering than in previous work. Long propagation times are made feasible by adding an absorbing potential at large distance. The times now extend to beyond 100 ps and enable a clarification of processes involving transient trapping of the He atoms. The wave packet is made more monochromatic by significantly increasing the spatial width of the initial Gaussian shape. The narrower energy distribution in the incident beam then enables a demonstration of strong energy dependence of the scattering over a scale of less than 0.3 meV.
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Affiliation(s)
- F Y Hansen
- Department of Chemistry, Technical University of Denmark, IK-207-DTU, Lyngby, Denmark.
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Effects of quadrupole moments of graphite surface on adsorption of simple gases on graphitized thermal carbon black. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2006.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Do DD, Do HD. Adsorption of argon on homogeneous graphitized thermal carbon black and heterogeneous carbon surface. J Colloid Interface Sci 2005; 287:452-60. [PMID: 15925610 DOI: 10.1016/j.jcis.2005.02.039] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2004] [Revised: 02/14/2005] [Accepted: 02/15/2005] [Indexed: 11/20/2022]
Abstract
In this paper we investigate the effects of surface mediation on the adsorption behavior of argon at different temperatures on homogeneous graphitized thermal carbon black and on heterogeneous nongraphitized carbon black surface. The grand canonical Monte Carlo (GCMC) simulation is used to study the adsorption, and its performance is tested against a number of experimental data on graphitized thermal carbon black (which is known to be highly homogeneous) that are available in the literature. The surface-mediation effect is shown to be essential in the correct description of the adsorption isotherm because without accounting for that effect the GCMC simulation results are always greater than the experimental data in the region where the monolayer is being completed. This is due to the overestimation of the fluid-fluid interaction between particles in the first layer close to the solid surface. It is the surface mediation that reduces this fluid-fluid interaction in the adsorbed layers, and therefore the GCMC simulation results accounting for this surface mediation that are presented in this paper result in a better description of the data. This surface mediation having been determined, the surface excess of argon on heterogeneous carbon surfaces having solid-fluid interaction energies different from the graphite can be readily obtained. Since the real heterogeneous carbon surface is not the same as the homogeneous graphite surface, it can be described by an area distribution in terms of the well depth of the solid-fluid energy. Assuming a patchwise topology of the surface with patches of uniform well depth of solid-fluid interaction, the adsorption on a real carbon surface can be determined as an integral of the local surface excess of each patch with respect to the differential area. When this is matched against the experimental data of a carbon surface, we can derive the area distribution versus energy and hence the geometrical surface area. This new approach will be illustrated with the adsorption of argon on a nongraphitized carbon at 87.3 and 77 K, and it is found that the GCMC surface area is different from the BET surface area by about 7%. Furthermore, the description of the isotherm in the region of BET validity of 0.06 to 0.2 is much better with our method than with the BET equation.
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Affiliation(s)
- D D Do
- Department of Chemical Engineering, University of Queensland, St. Lucia, Qld 4072, Australia.
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Bruch LW, Hansen FY. Excitation of the shear horizontal mode in a monolayer by inelastic helium atom scattering. J Chem Phys 2005; 122:114714. [PMID: 15836250 DOI: 10.1063/1.1869416] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Inelastic scattering of a low-energy atomic helium beam (HAS) by a physisorbed monolayer is treated in the one-phonon approximation using a time-dependent wave packet formulation. The calculations show that modes with shear horizontal polarization can be excited near high symmetry azimuths of the monolayer, in agreement with recent experiments. The parameters of the calculations are chosen to match the conditions of HAS experiments for triangular incommensurate monolayer solids of xenon, krypton, and argon adsorbed on the (111) face of platinum, and the results show many of the systematic experimental trends for relative excitation probability of the shear horizontal and longitudinal acoustic phonon branches. The inelastic scattering at beam energies near 8 meV is exceedingly sensitive to small misalignment between the scattering plane and the high symmetry directions of the monolayer solid. The diffraction and inelastic processes arise from a strong coupling of the incident atom to the target and the calculated results show large departures from expectations based on analogies to inelastic thermal neutron scattering.
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Affiliation(s)
- L W Bruch
- Department of Physics, University of Wisconsin-Madison, 53706, USA
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Smith AP, Benedek R, Trouw FR, Minkoff M, Yang LH. Quasi-two-dimensional quantum states of H2 in stage-2 Rb-intercalated graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:10187-10199. [PMID: 9982587 DOI: 10.1103/physrevb.53.10187] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Youn HS, Meng XF, Hess GB. Multilayer adsorption of xenon, krypton, and argon on graphite: An ellipsometric study. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:14556-14576. [PMID: 10007878 DOI: 10.1103/physrevb.48.14556] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ho T, Rabitz H. Inversion of gas–surface scattering data for potential determination using functional sensitivity analysis. I. A case study for the He–Xe/C(0001) potential. J Chem Phys 1991. [DOI: 10.1063/1.459902] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Polanyi JC, Williams RJ, O’Shea SF. Structure of adsorbates on alkali halides (theory). I. HBr on LiF(001). J Chem Phys 1991. [DOI: 10.1063/1.459937] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Youn HS, Hess GB. Reentrant first-order layering transitions in multilayer argon films on graphite. PHYSICAL REVIEW LETTERS 1990; 64:918-921. [PMID: 10042114 DOI: 10.1103/physrevlett.64.918] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Jung DR, Cui J, Frankl DR, Ihm G, Kim H, Cole MW. He atom near methane-plated MgO: Interaction and scattering. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:11893-11901. [PMID: 9991795 DOI: 10.1103/physrevb.40.11893] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Aziz RA, Buck U, Jónsson H, Ruiz‐Suárez J, Schmidt B, Scoles G, Slaman MJ, Xu J. Two‐ and three‐body forces in the interaction of He atoms with Xe overlayers adsorbed on (0001) graphite. J Chem Phys 1989. [DOI: 10.1063/1.457364] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Schwartz C, Karimi M, Vidali G. Theoretical calculations of He scattering intensities from MgO. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 39:11131-11134. [PMID: 9947928 DOI: 10.1103/physrevb.39.11131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gibson KD, Sibener SJ. Inelastic helium scattering studies of ordered Ar, Kr, and Xe monolayers physisorbed on Ag(111): Dispersion curves, scattering cross sections, and excitation line shapes. J Chem Phys 1988. [DOI: 10.1063/1.454300] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gibson KD, Cerjan C, Light JC, Sibener SJ. Elastic helium scattering studies of ordered overlayers of Ar, Kr, and Xe physisorbed on Ag(111). J Chem Phys 1988. [DOI: 10.1063/1.454302] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kim HY, Cole MW. Three-body contribution to the adsorption potential of atoms on graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:3990-3994. [PMID: 9941923 DOI: 10.1103/physrevb.35.3990] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Nham HS, Drir M, Hess GB. Multilayer phase diagram of CF4 adsorbed on graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 35:3675-3678. [PMID: 9941883 DOI: 10.1103/physrevb.35.3675] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Schwartz C. Scattering of helium atoms from rare-gas-plated graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 34:2834-2839. [PMID: 9939982 DOI: 10.1103/physrevb.34.2834] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Jónsson H, Weare JH. Many-body corrections to the intermolecular interaction probed with atom-surface scattering. PHYSICAL REVIEW LETTERS 1986; 57:412-415. [PMID: 10034053 DOI: 10.1103/physrevlett.57.412] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Schwartz C, Cole MW. Band structure and heat capacity of low-coverage helium films on noble-gas-plated graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 34:1250-1256. [PMID: 9939743 DOI: 10.1103/physrevb.34.1250] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Drir M, Nham HS, Hess GB. Multilayer adsorption and wetting: Ethylene on graphite. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:5145-5148. [PMID: 9939010 DOI: 10.1103/physrevb.33.5145] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Fowler PW, Hutson JM. Pairwise-additive models for atom-surface interaction potentials: An ab initio study of He-LiF. PHYSICAL REVIEW. B, CONDENSED MATTER 1986; 33:3724-3735. [PMID: 9938782 DOI: 10.1103/physrevb.33.3724] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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