Kinetic energy dependencies

Su T 1985 Kinetic energy dependences of ion poiar moiecuie coiiision rate constants by tra]ectory caicuiations J. Chem. Phys. 82 2164-6... 

Kinetic theory A mathematical explanation of the behavior of gases on the assumption that gases consist of molecules in ceaseless motion in space. The molecular kinetic energy depends on the temperature of the gas. 

More direct observations of the kinetic energy dependence of cross-sections should be possible using external ionization techniques where the reactant ion can be chosen by initial mass analysis and, in principle, its energy more readily controlled. Several studies using external ionization techniques, both with (2, 10, 45) and without (20, 21, 27, 41) preliminary mass selection of the reactant ion, have been reported. However, apparently with these techniques it is not possible to obtain well-defined primary ion beams at energies below 0.5-1 e.v. a region of critical importance both experimentally and theoretically. 

Does it bother you to find that neither the chemical formula nor the molar mass is needed for these calculations Remember that not all data are necessarily required for any particular calculation. Because average kinetic energy depends on temperature but not on molar mass, we do not need mass information to do this problem. 

Armentrout and Rogers also suggest more suitable anchor points for the LCA scale, e.g. the lithium cation bond energies to methanol or dimethyl ether. They further examined the kinetic energy dependences of the CID of Li+—ROH with and reported that the dominant dissociation process in all cases is the loss of alcohol. The thresholds for Li+—ROH dissociations were determined and converted to enthalpies and free energies at 298 and 373 K for comparison with previous equihbrium data on these systems. LCA values at 298 K for a series of alcohols are summarized in Table 3. The experimental results are compared with enthalpies of binding (PA) at 298 K (Figure 2) and a linear correlation between the LCA and the PA is found. 

Figure 25. Kinetic-energy dependence of cross section for reaction (O ) + Ne— O+H-O + Ne.50...

Figure 45. Kinetic-energy dependence of apparent cross section for production of 476.5-nm emission from Ar+ produced by He+ impact on argon.337... 

The quantitative evaluation of relative intensities for selected photo- or Auger processes requires information about both the relative kinetic energy dependence of the analyser transmission T (see Fig. 4.15) and the accompanying detection efficiency e of the electron detector. The relative magnitude for the desired product Te can be determined directly if, for example, non-coincident electron and ion spectrometry are combined with helium as target gas, the Is photoline is recorded as a function of the photon energy and yields the dispersion corrected area AD (electron) see equ. (2.39) ... 

The molecules in the sample show a range of kinetic energies, but the average kinetic energy depends only on the temperature. 

Figure 16 Incidence kinetic energy dependence of the excitation and de-excitation probability for NO(v = 2) scattering from Au(l 1 1) for two surface temperatures. De-excitation (v = 2 -> 1) triangles and diamonds. Excitation (v = 2 -> 3) squares and circles. Lines are explained in the original reference. From Huang et al. [135].

Becke AD (1994) Thermochemical tests of a kinetic-energy dependent exchange-correlation approximation, Int. J. Quant. Chem. Symp, 98 625-632... 

X-edge absorption spectra of 3d and 4d metals (205,206) show similar XANES for metals with similar crystal structure. After recalibration of the energy scales, in order to remove the trivial kinetic energy dependence on lattice spacing, the observed peak positions are a signature of the environment of the absorber as determined by local geometry only. The amplitude of features due to specific bands are proportional to the hybridization strength or wave character (204). 

The methods introduced above for measuring the kinetic energy dependence of CID reactions can also be applied with success to bimolecular reactions, such as... 

---