Cross section charge transfer

Fig. 8. Relative velocity dependence of integral cross sections calculated for Na + O collisions for the indicated exit channels. The solid curve is the charge transfer cross section calculated using a multichannel Landau-Zener formalism (see text). The dashed curve is the two-state Landau-Zener cross section. Charge transfer calculations by van den Bos are indicated by triangles. Full circles and squares are the respective excitation channels as determined using the multichannel Landau-Zener model.

The general properties of nuclei are presented in two sections (Nos. 1-2) of Table 2. Data on the charged particle reactions yields and cross sections da/dfl, a, etc., see Nos. 3-4 of Table 2) and spectroscopic factors (S n, see No. 5) derived from the experimental data on cross sections of transfer reactions are given after E and are followed by the main reference. 

The major problem in method (a) is that in ion-molecule interchange, considerable momentum in the direction of travel of the incident ion is imparted to both final products. Hence, in a perpendicular type apparatus only transfer of low weight particles can be observed at all and only at very low velocities of the incident ions (1, 9, 10, 11, 12, 13, 19, 20, 23, 27). Cross-sections cannot be measured. The value of these investigations is that some ion-molecule reactions—e.g., proton transfer and hydride ion transfer—can be identified. The energetics and the competition between charge exchange and ion-molecule reactions can be discussed, and by using partially deuterated compounds, one can obtain a detailed picture of the reaction. 

The production of N02 by charge transfer from either SF6 or SF5 , previously observed by Curran (4), has been confirmed during this work. The attachment cross-section curves for SF6 and for SF5 closely overlapped in the low energy range, and it was impossible to determine whether SF6 or SF5 was the reacting ion. 

Gustafsson and Lindholm (19) have shown the effects of translational energy on charge transfer reactions with H2, N2, and CO. They observe that endothermic reaction cross-sections increase with increasing kinetic... 

In this derivation a, the charge transfer cross-section is assumed to remain constant within the energy range applicable. Equation 3 describes the energy distribution of the ions at the cathode, and its general form has been substantiated experimentally (2). 

The corrected data thus obtained could be used to evaluate the variation of the cross-section of the dissociative charge-transfer reaction with ion energy. 

In Figure 2, we show the total differential cross-section for product molecules in the vibrational ground state (no charge transfer) of the hydrogen molecule in collision with 30-eV protons in the laboratory frame. The experimental results that are in arbitrary units have been normalized to the END... 

What role does the dopant play in APPI (Ionization of molecules having a low photoionization cross section (probability) has been shown to be enhanced by the use of a dopant that is introduced into the vaporized plume of analyte molecules the dopant is selected on the basis of its high UV absorptivity and serves as a charge transfer reagent). 

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