Core electron kinetic energy

Cordierite-supported perovskites, preparation impregnation, 36 251-253 plasma spraying, 36 253 Core electron kinetic energy of, 34 211 spectra of, 34 210... 

The total energy in an Molecular Orbital calculation is the net result of electronic kinetic energies and the interactions between all electrons and atomic cores in the system. This is the potential energy for nuclear motion in the Born-Oppenheimer approximation (see page 32). 

Fig. 4.29. Normalized integrated intensities (left) of substrate core levels in dependence on deposition time for the spectra shown in Fig. 4.26. The deposition rate is estimated to be 2nmmin 1. The lines in the left graph are obtained by curve fitting of the data to an exponential decay. The derived attenuation times are displayed in the right graph in dependence on electron kinetic energy together with theoretical energy-dependent escape depth calculated using the formula by Tanuma, Powell, and Penn [37] and using a y/ E law [38]...

By substantially increasing the electron kinetic energy in ILEED and SEELFS to 60-300 KeV, one reaches a situation that can resemble EXAFS, with electrons replacing the EXAFS photons, cf. Figure 11. Chemical selectivity, is obtained by choosing an appropriate core excitation edge. And surface sensitivity on the atomic scale exists mainly for high-surface-area materials, as with EXAFS. 

The well-known muffin-tin model of the electron atom interaction potential has in most cases proved to be an adequate compromise between accuracy and computational efficiency, at least for electron kinetic energies exceeding 20 eV./27,28,29/ The muffin-tin potential is spherical inside the muffin-tin spheres. This ion core usually provides the dominant contribution to electron scattering and emission, to be discussed shortly. 

The partitioning scheme of Thiel (1982) has been extended to molecules with a 2n ion-core (Raseev, et al., 1987). In this case, the electrons can be ejected from either the 2Il3/2 or the 2IIi/2 sublevel. For the same electron kinetic energy ... 

The shift in measured by XPS core level binding energies between a rare gas such as xenon in the gas phase and adsorbed on a surface results from a combination of chemical shift, local potential at the site of the adsorbate, and stabilization of the photoionization core hole by polarization of the substrate electron density. As discussed in reference (13), the contribution due to substrate polarization is related to the surface electronic polarizability and can be isolated from the other contributions to a good approximation by measurements of the xenon gas phase and adsorbed phase "Auger parameter", a. a is defined as the difference between the (Jkl) core level Auger electron kinetic energy, K (jkl), and the (j) core level photoelectron kinetic energy, K (J). 

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