Single-electron Charge Transfer Research Articles

Crossed-beam investigation of the single-electron charge transfer process Kr 2+ + He → Kr + + He + at sub-eV collision energies

The elementary single-electron charge transfer reaction between Kr 2+ and He has been investigated in a scattering experiment at the collision energies 0.3–0.5 eV. Relative differential and total cross-sections of the main state-to-state processes have been obtained. The spin-orbit states of Kr +, 2 P 3/2 and 2 P 1/2, are populated about equally in collisions between Kr 2+ ( 1 S 0) and He; the ratio of the cross-sections Kr 2+ ( 1 D 2) → Kr + ( 2 P 3/2) to Kr 2+ ( 1 S 0) → Kr + ( 2 P J ) is approximately 10 −2.

Quantal and classical calculations of He2++Li interactions at intermediate energies. I. Charge transfer

The authors report a comparative study of the quantal and classical treatments of single-electron charge transfer from the L and K shells of Li(1s22s) in collision with He2+ ions at intermediate energies. Quantal calculations have been performed using coupled-state atomic orbital expansions with up to 43 pseudostates in the basis, within the impact parameter formalism, for impact energies of 8 to 2000 keV lab. Classical trajectory Monte Carlo calculations for L-shell capture, using a model potential for the active electron, have been performed for impact energies from 50 to 400 keV, and using an effective-charge model for K-shell capture at impact energies from 600 to 2000 keV lab.

Excitation and ionisation resulting from electron capture in Ar6++H2collisions at ion projectile energies of 200-1200 keV

Photon emission between 20 and 250 nm, and slow electron and ion production cross sections have been measured for collisions between Ar6+ and H2 at impact energies from 200 to 1200 keV. These studies indicate that single electron charge transfer into excited states of the product ion is the most important inelastic process. The capture occurs mainly into n=4 levels with the excitation of the higher angular momentum states dominating over most of the projectile energy range. Slow electrons are apparently produced primarily by the capture ionisation process in which the projectile captures an electron and an additional electron is emitted from the target. The capture ionisation cross section is appreciable, amounting to 30 to 40% of the total excitation cross section.

Electrode kinetic studies of single electron charge transfer redox couples using the faradaic rectification method,

Electrode kinetic studies of single electron charge transfer redox couples using the faradaic rectification method,

Electrode kinetic studies of single electron charge transfer redox couples using the faradaic rectification method

Three single electron charge transfer redox reactions have been studied using the faradaic rectification method. The kinetic parameters obtained for the ferricyanide-ferrocyanide redox couple are α=0.49, k a 0=12×10 −2 cm s −1; for the chromic-chromous system α=0.47, k a 0=2×10 −3 cm s −1 and for the titanic-titanous reaction α=0.49 and k a o=6×10 −4 cm s −1 at 27°C.

On the Deposition and Dissolution of Zinc in Alkaline Solutions

The zinc/KOH‐zincate electrode reaction was investigated under high purity conditions with galvanostatic and potentiostatic transient techniques in the 0.1–3.0M and 0.0001–0.5M zincate concentration range. The exchange current density was found to be between 8 and 370 mA/cm2, with 40 mV/decade anodic and 120 mV/decade cathodic nominal Tafel slopes; an overpotential range of ± 100 mV was covered. The cathodic reaction orders were 1 for zincate, and −1 for hydroxyl ions. A four‐step mechanism, consistent with the kinetic data, is suggested. It consists of four consecutive dissociation reactions of the zincate complex, with two of them incorporating a single electron charge transfer. The rate‐determining step is The mechanism of the anodic and cathodic reactions is the same. The transients indicate only double layer charging and charge transfer processes. No surface diffusion effects or intermediate build‐up was observed (no pseudocapacitance). A rationalization is given for the mechanism. The effect of zinc surface preparation is discussed.