Determination of the rate constants for population of the individual Cd+* levels in thermal Penning and charge transfer reactions of He*(23S1) and He+with cadmium

Baltayan, P.; Pebay-Peyroula, J.C.; Sadeghi, N.

doi:10.1088/0022-3700/18/17/021

Cited by 32 publications

(12 citation statements)

References 34 publications

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“…[14] have obtained agreement with the results of Sadeghi and co-workers [6] in He++Cd collisions, however, the partial rate constants for some states have discrepancies up to factors of 6. This fact suggests that some partial rate constants are measured quite accurately.…”

Section: Introductionsupporting

confidence: 72%

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Theoretical investigations of charge exchange with ion excitation in atomic collisions at thermal energies

Belyaev

1993

Phys. Rev. A

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The process of charge exchange with ion excitation is investigated theoretically. The multielectron and Inultichannel model for the process under consideration is proposed. The formulas for two-electron exchange coupling are obtained and discussed. The model is applied to the investigation of charge exchange with ion excitation in collisions of helium ions with mercury atoms at thermal energies. The matrix elements of exchange coupling, the adiabatic potential energies, the partial cross section, and the partial rate constant for the process under consideration are calculated. The matrix elements of exchange coupling in this case are mainly determined by electron-core interactions. The effective potentials are used for these interactions. The calculated partial rate constant for excitation of Hg+(7p P3/2) agrees with experimental data.PACS number(s): 34.70. +e, 82.30.Fi, 34.50.Fa

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Section: Introductionsupporting

confidence: 72%

“…6) Az(1) being the single-electron Hamiltonian of an atom Matrix elements of exchange coupling h, &, Eq. (2.5), could be calculated by direct integration of all terms in the two-electron Hamiltonian H, (1,2) with a known two-electron wave function @M(r"rz).…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigations of charge exchange with ion excitation in atomic collisions at thermal energies

Belyaev

1993

Phys. Rev. A

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“…In Refs. [42] and [43] cross sections of Penning ionization and charge transfer were measured for He+-Cd and He+-Zn, respectively. In both cases we see that (i) the cross sections are almost identical to each other within a factor 1.5 and (ii) both Cd+ and Zn possess energy levels lying close to the He+ ground-state level.…”

Section: Description Of the Modelmentioning

confidence: 99%

Modeling of metastable argon atoms in a direct-current glow discharge

1995

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To calculate the behavior of metastable argon atoms in a direct-current glow discharge, a balance equation is constructed, taking into account all known production and loss processes of the metastable atoms. Density profiles and cruxes of the metastable atoms are computed. The relative importance of different production and loss processes determining the metastable density is calculated for the case of a molybdenum cathode in pure argon. Besides electron-impact excitation, fast-ion and atom-impact excitation are found to be the dominant production processes at the high voltages used here, while loss of the metastable atoms is caused predominantly by diffusion and also by electron quenching to the nearby resonant states. The role of metastable atoms in the total discharge is investigated. They are found to play a minor role in the ionization of argon atoms, but their part in the ionization of sputtered molybdenum cathode atoms appears to be rather important. Moreover, they seem to have a significant effect on the secondary electron emission at the cathode. The investigation also includes the influence of pressure, voltage, and current on the metastable densities and f1uxes, on the relative importance of the different production and loss processes, and on the role of metastable atoms in the entire discharge.

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“…Most of the earlier rate coefficient measurements of ACT reactions between noble gas ions and metal atoms were carried out with volatile metals, such as Hg, Pb, Cd, Zn, or Tl. [22][23][24][25][26] There are very few rate coefficient and cross-section data available for other elements, that are difficult to evaporate, e.g., Cu, Fe, Ti, Ni, and Mo. For the Ne-Cu + system, a) Electronic mail: Ihor.Korolov@gmail.com.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the asymmetric charge transfer reaction between Ar+ ions and Fe atoms

Korolov

Bánó

Derzsi

et al. 2011

The Journal of Chemical Physics

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We investigate the Ar(+)-Fe asymmetric charge transfer (ACT) reaction using a combination of plasma diagnostics methods and a kinetic model of the afterglow plasma, which allow monitoring of the temporal evolution of the densities of different species. The iron vapor is created inside a discharge cell by cathode sputtering; its density is measured by atomic absorption spectroscopy. The rate coefficient of the reaction is evaluated from the emission intensity decay of Fe(+)∗ lines pumped by the ACT process in the He-Ar-Fe and Ar-Fe afterglow plasmas. The measurements yield a rate coefficient k = 7.6( ± 3.0) × 10(-9) cm(3) s(-1) at T = 300 K.

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Determination of the rate constants for population of the individual Cd⁺* levels in thermal Penning and charge transfer reactions of He*(2³S₁) and He⁺with cadmium

Cited by 32 publications

References 34 publications

Theoretical investigations of charge exchange with ion excitation in atomic collisions at thermal energies

Theoretical investigations of charge exchange with ion excitation in atomic collisions at thermal energies

Modeling of metastable argon atoms in a direct-current glow discharge

Experimental study of the asymmetric charge transfer reaction between Ar+ ions and Fe atoms

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