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Direct-inelastic scattering

Here we shall be concerned with the interaction of inacming diatomic molecules (H-/ 0.) with either types of potential energy wells The molecular InteractJjon (responsible for elastic and direct-inelastic scattering with extremely short residence times of the irpinglng molecules in the potential) and the chemisorptive interaction (leading to dissociative adsorption and associative desorption, reflectively, and associated with H (D) atoms trapped in the chemisorption potential for an appreci le time). [Pg.224]

Thermal distributions of NO(u 2, J, A Ej,) states were observed, wherein the population in any level was determined by the internal energy and the parameter Tr. and independent of spin-orbit state or lambda doublet species. This is in contrast to the rotational rainbows, the propensities for preferential population in the Il(A ) lambda doublet species and the Fj spin orbit state which were observed in direct inelastic scattering of NO/Ag(l 11). [Pg.56]

Fig. 5. Rotational temperatures ofNO desorbing from Pt(l 11). The data are representative of data published for (x) neat thermal desorption , ( +) thermal desorption in the presence of coadsorbed C0 ° (solid squares) and (solid triangles) trapping/desorption in molecular beam scattering, (open triangle) reaction limited desorption from NO-NHj complexes, (open circle) and (open square) NHj oxidation reactions. The solid line is for full accommodation. The dashed curve represents results for translational energy measurements in direct inelastic scattering ... Fig. 5. Rotational temperatures ofNO desorbing from Pt(l 11). The data are representative of data published for (x) neat thermal desorption , ( +) thermal desorption in the presence of coadsorbed C0 ° (solid squares) and (solid triangles) trapping/desorption in molecular beam scattering, (open triangle) reaction limited desorption from NO-NHj complexes, (open circle) and (open square) NHj oxidation reactions. The solid line is for full accommodation. The dashed curve represents results for translational energy measurements in direct inelastic scattering ...
For the cube model, when Eq>E , trapping into the adsorption well occurs. Therefore, there is a critical energy Ec such that the trapping coefficient a = 1 for E Ec. For the stationary cube,... [Pg.160]

Figure 3.17. Vibrational excitation of NO (v = l)/v = 0) in direct inelastic scattering from Ag(111), (a) as a function of the surface temperature Ts at two incident energies. The straight lines are Arrhenius fits with an effective activation energy of the NO vibrational frequency. The two sets of data at the different Et are arbitrarily scaled relative to each other for clarity, (b) as a function of incident normal energy En at Ts = 760 K. From Ref. [175]. Figure 3.17. Vibrational excitation of NO (v = l)/v = 0) in direct inelastic scattering from Ag(111), (a) as a function of the surface temperature Ts at two incident energies. The straight lines are Arrhenius fits with an effective activation energy of the NO vibrational frequency. The two sets of data at the different Et are arbitrarily scaled relative to each other for clarity, (b) as a function of incident normal energy En at Ts = 760 K. From Ref. [175].
With the exception of vibrational excitation, most of the behavior observed in NO/Ag(lll) direct inelastic scattering has now been observed in the scattering of... [Pg.193]

Figure 6 Schematic potential energy diagrams for the interaction between O2 and Ag(l 11). Four panels are shown. In (a), the three states into which O2 can adsorb at the surfaces are depicted as a function of a reaction coordinate. In (b), the two potentials leading to direct inelastic scattering are shown. In (c), a trajectory representing a one dimensional representation of transient trapping-desorption in the O2 state is shown. In (d), two path ways leading to dissociative chemisorption are shown. From Kleyn et al. [45],... Figure 6 Schematic potential energy diagrams for the interaction between O2 and Ag(l 11). Four panels are shown. In (a), the three states into which O2 can adsorb at the surfaces are depicted as a function of a reaction coordinate. In (b), the two potentials leading to direct inelastic scattering are shown. In (c), a trajectory representing a one dimensional representation of transient trapping-desorption in the O2 state is shown. In (d), two path ways leading to dissociative chemisorption are shown. From Kleyn et al. [45],...
Fig. 19. Newton diagram for direct inelastic scattering of O atoms following impact of O atoms at ( j) = 504 kJ mol and = 60° on a squalane surface. Fig. 19. Newton diagram for direct inelastic scattering of O atoms following impact of O atoms at ( j) = 504 kJ mol and = 60° on a squalane surface.
Hurst J E, Becker C A, Cowin J P, Janda K C, Auerbach D J and Wharton LI 979 Observation of direct inelastic scattering in the presence of trapping-desorption scattering Xe on Pt(111) Phys. Rev. Lett. 43 1175... [Pg.916]

FIGURE 3.10. Scattering of NO from an oxidized Ge surface [37]. (a) Time-of-flight distributions of the incident and scattered molecules in various rotational states ]". (b) Correlation between the mean translational and the rotational energy for molecules undergoing direct inelastic scattering (a) and trapping desorption (b). [Pg.67]


See other pages where Direct-inelastic scattering is mentioned: [Pg.226]    [Pg.226]    [Pg.61]    [Pg.62]    [Pg.77]    [Pg.83]    [Pg.152]    [Pg.180]    [Pg.183]    [Pg.184]    [Pg.207]    [Pg.225]    [Pg.225]    [Pg.290]    [Pg.290]    [Pg.81]    [Pg.88]    [Pg.92]    [Pg.94]    [Pg.98]    [Pg.100]    [Pg.100]    [Pg.428]    [Pg.454]    [Pg.460]    [Pg.460]    [Pg.336]    [Pg.166]    [Pg.60]    [Pg.60]    [Pg.76]    [Pg.916]    [Pg.54]    [Pg.68]    [Pg.345]    [Pg.387]   
See also in sourсe #XX -- [ Pg.428 ]

See also in sourсe #XX -- [ Pg.54 ]




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Diatomic molecules direct Inelastic scattering

Direct scattering

Inelastic

Inelastic scatter

Inelasticity

Scatter inelastically

Scattering direction

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