The Binary-Encounter-Bethe Model for Computation of Singly Differential Cross Sections Due to Electron-Impact Ionization

Garkoti, Pankaj; Luthra, Meetu; Goswami, Kanupriya; Bharadvaja, Anand; Baluja, K. L.

doi:10.3390/atoms10020060

Cited by 6 publications

(1 citation statement)

References 64 publications

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“…The SDCS data can be further used to obtain averaged energy of secondary electrons, an important quantity in the studies involving plasma simulations and irradiation of molecules [112]. The BEB model has proved effective in computing SDCS [113]. The SDCS at incident electron energies 75 eV, 100 eV, and 200 eV are plotted in figure 11.…”

Section: Total and Partial Ionization Cross Sectionsmentioning

confidence: 99%

Electron impact cross-sections of tetraethyl silicate

Luthra¹,

Garkoti²,

Goswami³

et al. 2022

Plasma Sources Sci. Technol.

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The understanding of electron interactions with molecules in plasma is of vital importance from academic and technological point of view. The reliable electron collision data is required to model the electron and ion components of low-temperature and non-equilibrium plasmas. Various electron impact cross-sections like the differential, integral, momentum transfer, partial and total ionizations are reported for tetraethyl silicate (TEOS), a plasma relevant molecule in the energy range between ionization threshold and 5~keV. The elastic (differential, integral and momentum transfer) cross-sections are obtained by invoking the molecular approach and local potential approximation within the single center expansion formalism. The dissociative ionization cross-sections are reported with in the binary-encounter-Bethe (BEB) model formalism. The elastic and ionization cross-sections are summed incoherently to estimate total cross-sections. A good agreement is observed between the present and available results. This work validates the efficacy of the modified-BEB model in computing the partial ionization cross-sections.

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Section: Total and Partial Ionization Cross Sectionsmentioning

confidence: 99%

Electron impact cross-sections of tetraethyl silicate

Luthra¹,

Garkoti²,

Goswami³

et al. 2022

Plasma Sources Sci. Technol.

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Electron Scattering from Pyrimidine up to 5 keV

Luthra,

Bharadvaja,

Prashant

et al. 2024

Braz J Phys

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Electron beam impact parameters for the creation of excited species in N2 gas

et al. 2023

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The number of electron–ion pairs and the distribution of excited species created by the passage of an intense electron beam in a gas are important parameters for many applications. The previously published values for molecular nitrogen rely on a differential ionization cross section that uses a number of fitting parameters and excitation cross sections determined from analytical fitting functions [S. P. Slinker, A. W. Ali, and R. D. Taylor, J. Appl. Phys. 67, 679 (1990)]. Slinker used cross section fits to solve the Boltzmann equation which was then used to compute the important beam-impact parameters. In this work, it is shown that an alternative approach based on the continuous slowing down approximation (CSDA) can be used to compute the energy expended per electron-ion pair and the distribution of excited gas species. This method results in an integral equation that can be solved iteratively and converges rapidly. The binary-encounter Bethe (BEB) differential ionization cross section is used [Y. K. Kim and M. E. Rudd, Phys. Rev. A 50, 3954 (1994); W. Hwang, Y.-K. Kim and M. E. Rudd, J. Chem. Phys. 104, 2956 (1996)]. The BEB model naturally extends to relativistic energies and has no free parameters. This makes the BEB considerably easier to use than previous models based on fitting parameters. The BEB model requires orbital constants obtained from quantum chemistry calculations. To demonstrate the technique, the electron-beam impact parameters are computed for nitrogen gas. The tabulated low-energy excitation cross sections are extended to relativistic energies using Bethe's asymptotic value for the inelastic cross sections [M. Inokuti, Rev. Mod. Phys. 43, 297 (1971)]. It is shown that the results for the energy expended per electron–ion pair as well as the distribution of excited states agree with published experimental values and are similar to previously published theoretical results.

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The Binary-Encounter-Bethe Model for Computation of Singly Differential Cross Sections Due to Electron-Impact Ionization

Cited by 6 publications

References 64 publications

Electron impact cross-sections of tetraethyl silicate

Electron impact cross-sections of tetraethyl silicate

Electron Scattering from Pyrimidine up to 5 keV

Electron beam impact parameters for the creation of excited species in N2 gas

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