Electron impact ionisation of alkali metal ions

Kumar, Abhishek; Roy, B N

doi:10.1088/0022-3700/12/23/022

Cited by 11 publications

(6 citation statements)

References 26 publications

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“…Henceforth, this formula of Vriens is referred to as the BEA model in this article. Roy and Rai 11, 12, Kumar and Rai 13, Jha and Roy 14, and Jha 15 extended this model to the single and double ionization of atoms and ions using Hartree–Fock velocity distribution for the target electron. Kunc 16, 17 has also applied this model to targets with a one‐electron outer shell in both the ground and the excited state.…”

Section: Introductionmentioning

confidence: 99%

Electron‐impact single ionization cross sections of helium isoelectronic systems

Uddin

Basak

Saha

2004

Int J of Quantum Chemistry

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ABSTRACT:-are calculated using a recently propounded parameter-free relativistic binary encounter (RBEA) model, which remains valid up to the relativistic energy domain. Our RBEA results are compared with those of the Coulomb-Born (CB) approximation, distorted wave Born approximation (DWBA), relativistic two-potential DWBA (RTPD), the simple empirical model of Brenshtam et al. (BRY), and the model of Deutsch and Märk (DM) along with the available experimental data. The RBEA model, while keeping the comparable predictive power of cross sections, is found to overcome the limitations of the empirical BRY and DM models with their fitting parameters, and the quantum mechanical CB, DWBA, and RTPD theories with arduous and lengthy calculations.

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Section: Introductionmentioning

confidence: 99%

Electron‐impact single ionization cross sections of helium isoelectronic systems

Uddin

Basak

Saha

2004

Int J of Quantum Chemistry

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“…Roy and Rai [23,24], Kumar and Roy [25], Jha and Roy [26], and Jha [27] extended this model to the single ionization of ions and double ionization of atoms using the Hartree-Fock velocity distribution of the target electron. Kunc [28,29] also applied the Vriens model in the dimensionless form to targets with a one-electron outer shell in both the ground and excited states.…”

Section: Introductionmentioning

confidence: 99%

“…Vriens 22 modified the classical binary encounter approximation (BEA) model of Gryzinski by inclusion of an exchange term and a term denoting the interference between the exchange and direct terms. Roy and Rai 23, 24, Kumar and Roy 25, Jha and Roy 26, and Jha 27 extended this model to the single ionization of ions and double ionization of atoms using the Hartree–Fock velocity distribution of the target electron. Kunc 28, 29 also applied the Vriens model in the dimensionless form to targets with a one‐electron outer shell in both the ground and excited states.…”

Section: Introductionmentioning

confidence: 99%

Binary encounter model for the electron impact K‐shell ionization of atoms

Patoary

Uddin

Haque

et al. 2008

Int J of Quantum Chemistry

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ABSTRACT:The electron impact K-shell ionization (EIKSI) cross sections on 18 atomic targets, with the atomic numbers 2 Յ Z Յ 92, are calculated using a modified version of the binary encounter approximation (BEA) model. The modified BEA (MBEA), which incorporates both ionic and relativistic corrections and is simpler in application than other existing models, is found to be immensely successful in describing the EIKSI data up to the incident energy of 1 GeV.

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“…Thomas and Garcia [39] have modified the expression for the ionization cross-section given by Gerjuoy [40]. Kumar and Roy [41] used with success the model of Thomas and Garcia for the calculation of cross-sections for alkali metal ions. Encouraged by this, we include the ionic correction of [39] with the BED model resulting in what is referred to as the BEDTG model.…”

Section: Introductionmentioning

confidence: 99%

“…Encouraged by this, we include the ionic correction of [39] with the BED model resulting in what is referred to as the BEDTG model. It is important to note that in both the works [39,41], this correction yields an overestimation of cross-sections in the threshold region. In view of this, we adapt a modification in the BEDTG model using our proposed Burgess denominator t + (u − 1)/(q − 2).…”

Section: Introductionmentioning

confidence: 99%

Electron impact single ionization of light ionic targets with chargeq> 2

Uddin¹,

Basak²,

Islam³

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

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The electron impact single ionization cross-section of light ionic targets with multiple charges greater than 2 is evaluated employing two distinct modifications of the binary-encounter dipole (BED) model, the intermediate BEDTG and the modified BED (MBED) models. BEDTG incorporates the ionic correction due to Thomas and Garcia, whereas MBED embodies modification of the Burgess denominator along with the ionic correction. The differential continuum oscillator strengths are obtained adopting the analytic fits to available photo-ionization cross-sections, calculated quantum mechanically. To assess the reliability of these proposed modifications, a few simple targets, e.g., C 3+ , N 4+ , O 4+ , O 5+ , Ne 6+ and Ne 7+ with known reliable theoretical results, are considered. Although the present MBED model seems to underestimate systematically the experimental data above 10 keV, it explains the data in the threshold and peak regions reasonably well with its predictions close to those from the Coulomb-Born approximation, convergent-close-coupling, distorted wave Born approximation with R-matrix, time-dependent and R-matrix pseudostate methods.

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Electron impact ionisation of alkali metal ions

Cited by 11 publications

References 26 publications

Electron‐impact single ionization cross sections of helium isoelectronic systems

Electron‐impact single ionization cross sections of helium isoelectronic systems

Binary encounter model for the electron impact K‐shell ionization of atoms

Electron impact single ionization of light ionic targets with chargeq> 2

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