The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Klaus Rendulic - One of the best experts on this subject based on the ideXlab platform.
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Adsorption dynamics for para- and n-hydrogen on Pt(110): Rotational State resolved sticking coefficients
Chemical Physics Letters, 1996Co-Authors: M. Beutl, M. Riedler, Klaus RendulicAbstract:Abstract We have used monoenergetic nozzle beams of para- and n -hydrogen to determine the adsorption dynamics in the so called ‘precursor regime’ on a (1 × 2) reconstructed Pt(110) surface. At low nozzle temperatures clear differences in the sticking coefficients of the two hydrogen modifications can be observed. An analysis of the data yields Rotational State resolved sticking coefficients for the J = 0, 1 and 2 States. There is a pronounced decrease of the sticking coefficients with increasing J at constant translational energy.
Greg O Sitz - One of the best experts on this subject based on the ideXlab platform.
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Rotational State resolved sticking coefficients for h2 on pd 111 testing dynamical steering in dissociative adsorption
Journal of Chemical Physics, 1997Co-Authors: Michael Gostein, Greg O SitzAbstract:We have measured the sticking coefficient of H2 on Pd(111) as a function of incident translational energy, over the range 31–94 meV, and initial H2 Rotational State J, for J=0 through J=5, at a surface temperature of 423 K. These measurements test recent theoretical predictions that the H2/Pd sticking coefficient should decrease with increasing J, for low J, because more quickly rotating molecules are less easily “steered” to dissociation sites by interaction with the surface as they approach the metal [A. Gross, S. Wilke, and M. Scheffler, Phys. Rev. Lett. 75, 2718 (1995)]. We find that the sticking coefficient is sensitive to the Rotational quantum number, first decreasing as J is raised from 0 to 3, then increasing again for J=4 and 5. The greatest sensitivity found occurs for an incident translational energy of 73 meV, for which the sticking coefficient decreases from 0.76±0.05 for J=0 to 0.54±0.13 for J=3. In addition, we have found that a fraction of the H2 incident in States J=0 and J=1 is excited ...
M. Beutl - One of the best experts on this subject based on the ideXlab platform.
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does the Rotational State of a molecule influence trapping in a precursor an investigation of n2 w 100 co fesi 100 and o2 ni 111
Surface Science, 1997Co-Authors: M. Beutl, K D Rendulic, G R CastroAbstract:Abstract We have used seeded nozzle beams to obtain molecules of identical translational energy but quite different Rotational energy to investigate the adsorption dynamics for precursor adsorption in the systems N 2 /W(100), CO/FeSi(100) and O 2 /Ni(111). The result of the investigation is unambiguous: there is no discernible influence of the Rotational State on the sticking coefficient. This is true for an intrinsic as well as for an extrinsic precursor. This leads to the conclusion that Rotational energy does not have to be accommodated immediately upon the first impact to facilitate trapping. Apparently the molecule can rotate more or less freely and the Rotational energy can be accommodated subsequently to trapping.
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Adsorption dynamics for para- and n-hydrogen on Pt(110): Rotational State resolved sticking coefficients
Chemical Physics Letters, 1996Co-Authors: M. Beutl, M. Riedler, Klaus RendulicAbstract:Abstract We have used monoenergetic nozzle beams of para- and n -hydrogen to determine the adsorption dynamics in the so called ‘precursor regime’ on a (1 × 2) reconstructed Pt(110) surface. At low nozzle temperatures clear differences in the sticking coefficients of the two hydrogen modifications can be observed. An analysis of the data yields Rotational State resolved sticking coefficients for the J = 0, 1 and 2 States. There is a pronounced decrease of the sticking coefficients with increasing J at constant translational energy.
Michael Gostein - One of the best experts on this subject based on the ideXlab platform.
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Rotational State resolved sticking coefficients for h2 on pd 111 testing dynamical steering in dissociative adsorption
Journal of Chemical Physics, 1997Co-Authors: Michael Gostein, Greg O SitzAbstract:We have measured the sticking coefficient of H2 on Pd(111) as a function of incident translational energy, over the range 31–94 meV, and initial H2 Rotational State J, for J=0 through J=5, at a surface temperature of 423 K. These measurements test recent theoretical predictions that the H2/Pd sticking coefficient should decrease with increasing J, for low J, because more quickly rotating molecules are less easily “steered” to dissociation sites by interaction with the surface as they approach the metal [A. Gross, S. Wilke, and M. Scheffler, Phys. Rev. Lett. 75, 2718 (1995)]. We find that the sticking coefficient is sensitive to the Rotational quantum number, first decreasing as J is raised from 0 to 3, then increasing again for J=4 and 5. The greatest sensitivity found occurs for an incident translational energy of 73 meV, for which the sticking coefficient decreases from 0.76±0.05 for J=0 to 0.54±0.13 for J=3. In addition, we have found that a fraction of the H2 incident in States J=0 and J=1 is excited ...
M. Riedler - One of the best experts on this subject based on the ideXlab platform.
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Adsorption dynamics for para- and n-hydrogen on Pt(110): Rotational State resolved sticking coefficients
Chemical Physics Letters, 1996Co-Authors: M. Beutl, M. Riedler, Klaus RendulicAbstract:Abstract We have used monoenergetic nozzle beams of para- and n -hydrogen to determine the adsorption dynamics in the so called ‘precursor regime’ on a (1 × 2) reconstructed Pt(110) surface. At low nozzle temperatures clear differences in the sticking coefficients of the two hydrogen modifications can be observed. An analysis of the data yields Rotational State resolved sticking coefficients for the J = 0, 1 and 2 States. There is a pronounced decrease of the sticking coefficients with increasing J at constant translational energy.
