Abstract:Cross sections for charge transfer reactions between ions and neutral atoms and molecules have been measured in the energy range from 50 to 850 ev. Charge transfer cross sections for symmetrical reactions in monatomic and diatomic gases increase with increasing viscosity cross sections. The charge transfer cross sections decrease with increasing incident ion energy in conformity with the adiabatic criterion. For reactions in diatomic gases the charge transfer cross sections decrease as the changes in internucl… Show more
“…Together with our results for Ar+{Ar,Ar)Ar+, figure 5 also summarizes experimental [28][29][30][31][32][33][34][35][36][37][38][39][40][41] and theoretical [42][43][44][45][46][47] results for this reaction from the literature [48]. Prior to our work it was not clear which theoretical model one could or should use to obtain reliable estimates of UE values for use in target thickness calibrations in the 5-60 e V range of collision energies, the range typically used for CAD experiments.…”
Section: Discussionmentioning
confidence: 98%
“…5), as well as with the experimental u(E) of other workers (see fig. 5, data labeled HES [34), Z (28), H (35), KPS [37], DSEG [29], FS [36]). For the data labeled C [31], the UE values are sig.…”
The energy dependence of the cross section, cr(E), for the symmetric (resonant) charge transfer reaction Ar+(Ar,Ar)Ar+ was measured in our triple quadrupole (QQQ) tandem mass spectrometer. lOur cr(E), for P=0. [the range of collision energies
“…Together with our results for Ar+{Ar,Ar)Ar+, figure 5 also summarizes experimental [28][29][30][31][32][33][34][35][36][37][38][39][40][41] and theoretical [42][43][44][45][46][47] results for this reaction from the literature [48]. Prior to our work it was not clear which theoretical model one could or should use to obtain reliable estimates of UE values for use in target thickness calibrations in the 5-60 e V range of collision energies, the range typically used for CAD experiments.…”
Section: Discussionmentioning
confidence: 98%
“…5), as well as with the experimental u(E) of other workers (see fig. 5, data labeled HES [34), Z (28), H (35), KPS [37], DSEG [29], FS [36]). For the data labeled C [31], the UE values are sig.…”
The energy dependence of the cross section, cr(E), for the symmetric (resonant) charge transfer reaction Ar+(Ar,Ar)Ar+ was measured in our triple quadrupole (QQQ) tandem mass spectrometer. lOur cr(E), for P=0. [the range of collision energies
“…Agreement with the Firsov formula for / quite good. The experimental results of Dillon et a/., 9 and of Kushnir et al, 10 are also plotted. The theoretical calculation by Rapp and Francis 11 agrees closely with the lower of the two Firsov curves.…”
We have shown that the concentration of Xe + 2 Pz/2 ions formed in an electron-impact ion source may be monitored by utilizing near-resonant charge transfer of Xe + beams with molecular oxygen. This measurement provides a means of assaying the fraction of excited ions in the Xe + beam and affords a technique for studying the effects of fine structure on the symmetric charge-transfer process: Xe^-fXe -» Xe+Xe + . With 25-eV electrons, we find that the Xe + beam is about 80% 2 P 3 /2 state, while the remaining 20% appears to be principally 2 Pi/2. The charge-transfer cross section for the excited component in xenon was found to be 1.0±0.15 relative to that of the 2 P%ii ion, over a large range of incident ion energy.
“…(1). For this purpose we approximate the non-randomphase-approximation terms in the equation of motion 7 for the density fluctuation pj in the manner suggested by Singwi et al 8 for the case of an electron liquid. This procedure takes approximately into account local field corrections which in the present case, where we are dealing with a hard-core potential, are of primary importance.…”
Section: Sc D D D Dmentioning
confidence: 99%
“…The expression for ip(q) obtained in Ref. 8 can be written in the form ^(q) = ~irj [sin(qr)-qr cos (qr)]g(r)-^~-dr. (6) In the present case <p(r) is the 6:12 Lennard-Jones potential and^(r) is the equilibrium pair-distribution function. Equation (6) has been found 8 to be a reasonable approximation for large values of q.…”
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