Inelastic energy curve

GMP good manufacturing practice IEC inelastic energy curve... 

The IMFP (A) is the average distance that an electron with a given energy travels between successive inelastic collisions. Curves of A vs. the photoelectron kinetic energy have been compiled by several authors an overview is presented in Fig. 17. The scatter of the data is in part due to the influence of Ihe matrix for a given kinetic energy, the IMFP decreases as the matrix density increases. 

The role of rainbow scattering in elastic collisions of atoms and atomic ions is well known and provides an important link between experimental observation and the theoretical potential energy curve which governs the dynamics of the colliding atoms. Only recently, however, has the analogous phenomenon in the case of non-spherical potentials and inelastic collisions been investigated,... 

Fig. 11. "Universal curve" of inelastic mean free path, X, as a function of electron kinetic energy. Solid line is universal curve, points are experimental data...

FIGURE 4.5 Inelastic collision cross section of water vapor versus electron energy (LaVerne and Mozumder, 1992). Circles compilation of Hayashi (1989) dashed line unmodified theoretical formula (Pimblott et al., 1990) dot-dashed line theoretical formula scaled to match compilation full curve theoretical formula scaled to match experimental W values. 

Figure 11. Electron-energy-loss spectrum of crystalline boron nitride, showing the boron K-edge (at 190 eV) and the nitrogen K-edge (at 400 eV). The background intensity, delineated by the dashed curve arises from inelastic scattering by valence electrons. The hatched areas represent the measured values required for the quantitative analysis of boron ( see text) (50).

Fig. 3 Energy diagram for an M-A-M diode showing elastic and inelastic tunneling processes (top). The HOMO (n) and LUMO (71 ) orbital energies and a few vibrational levels are indicated. Applied bias energy (eV) is just sufficient to allow inelastic tunneling with excitation of the first vibrational level, eV = hv. Also shown (bottom) are the I(V) curve, conductance- / curve, and the IETS spectrum that would result from both elastic processes and the first inelastic channel. (Reproduced by permission of the American Chemical Society from [19])...

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 ...

Figure 3.12. Inelastic scattering of Ar from Pt(lll) at the various input energies listed in the figure and for an initial angle of incidence 0, = 45° and Ts = 800 K. Results are plotted as EfIE vs. the final scattered angle . Points are the experimental results and the lines marked adjacently in the label are results of molecular dynamics simulations on an empirical PES. The long dot-dashed curve is the prediction of a cube model of energy transfer, while the dashed curve is the prediction from hard sphere scattering. From Ref. [135].

Note Differential elastic and excitation transfer cross sections have been measured for He(2 S) + Nc and for He(23S) + Ne for energies between 25 and 370 meV (1). Some of the data are shown in Fig. 52. It was possible to measure the differential excitation cross sections for the triplet system, too. A semiclassical two-state calculation was performed for the pumping transition of the red line of the HeNe-laser Hc(2 S)+ Nc— Hc + Ne(5S, lPt), which is the dominant transition for not too high energies (2). A satisfactory fit is obtained to the elastic and inelastic differential cross sections simultaneously, as well as to the known rate constant for excitation transfer. The Hc(215)+ Ne potential curve shows some mild structure, much less pronounced than those shown in Fig. 36. The excitation transfer for the triplet system goes almost certainly over two separate curve crossings. This explains easily the 80 meV threshold for this exothermic process as well as its small cross section, which is only 10% of that of the triplet system. 

Fig. 2.1. Schematic illustration of the behaviour of the positron-helium and electron-helium total scattering cross sections. Notable are the large differences in magnitude of the cross sections at low energies, their merging at approximately 200 eV and the onset of inelastic processes at the positronium formation threshold EPS in the positron curve.

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