Calculation of electron-impact ionization of Mg and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Al</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>

Fursa, Dmitry V.; Bray, Igor; McNamara, Keegan

doi:10.1103/physreva.92.022705

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…For quasi two-electron targets, as considered here, the complexity of the electron-collision problem is such that substantial discrepancies may occur. This was recently highlighted for the e-Mg and e-Al + collision systems [16].…”

Section: Introductionmentioning

confidence: 76%

Calculations for electron-impact excitation and ionization of beryllium

Zatsarinny¹,

Bartschat²,

Fursa³

et al. 2016

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

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The B -spline R-matrix and the convergent close-coupling methods are used to study electron collisions with neutral beryllium over an energy range from threshold to 100 eV. Coupling to the target continuum significantly affects the results for transitions from the ground state, but to a lesser extent the strong transitions between excited states. Cross sections are presented for selected transitions between low-lying physical bound states of beryllium, as well as for elastic scattering, momentum transfer, and ionization. The present cross sections for transitions from the ground state from the two methods are in excellent agreement with each other, and also with other available results based on nonperturbative convergent pseudostate and time-dependent close-coupling models. The elastic cross section at low energies is dominated by a prominent shape resonance. The ionization from the (2s2p) 3 P and (2s2p) 1 P states strongly depends on the respective term. The current predictions represent an extensive set of electron scattering data for neutral beryllium, which should be sufficient for most modeling applications.

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Section: Introductionmentioning

confidence: 76%

Calculations for electron-impact excitation and ionization of beryllium

Zatsarinny¹,

Bartschat²,

Fursa³

et al. 2016

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

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“…The CCC method has already been extensively applied to the electron-magnesium collision system (Fursa & Bray 2001;Bartschat et al 2004;Brown et al 2005;Bray et al 2015). The atomic target is treated as two-electrons above an inert Hartree-Fock core (Fursa & Bray 1997).…”

Section: Theory and Calculationsmentioning

confidence: 99%

Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra

Barklem

Osorio

Fursa

et al. 2017

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Results of calculations for inelastic e+Mg effective collision strengths for the lowest 25 physical states of Mg i (up to 3s6p 1 P), and thus 300 transitions, from the convergent close-coupling (CCC) and the B-spline R-matrix (BSR) methods are presented. At temperatures of interest, ∼5000 K, the results of the two calculations differ on average by only 4%, with a scatter of 27%. As the methods are independent, this suggests that the calculations provide datasets for e+Mg collisions accurate to this level. Comparison with the commonly used dataset compiled by Mauas et al. (1988, ApJ, 330, 1008, covering 25 transitions among 12 states, suggests the Mauas et al. data are on average ∼57% too low, and with a very large scatter of a factor of ∼6.5. In particular the collision strength for the transition corresponding to the Mg i intercombination line at 457 nm is significantly underestimated by Mauas et al., which has consequences for models that employ this dataset. In giant stars the new data leads to a stronger line compared to previous non-LTE calculations, and thus a reduction in the non-LTE abundance correction by ∼0.1 dex (∼25%). A non-LTE calculation in a supernova ejecta model shows this line becomes significantly stronger, by a factor of around two, alleviating the discrepancy where the 457 nm line in typical models with Mg/O ratios close to solar tended to be too weak compared to observations.

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“…14-16. From the theoretical perspective, there has been significantly more work, with only the most recent and/or relevant papers now listed. Those studies include B-spline R-matrix (BSR) calculations from the Drake University group, [17][18][19] convergent close coupling (CCC) calculations from Curtin University, [18][19][20] and an optical potential (OP) variant 21 on what we report here. Note that there are many more earlier theoretical studies apart from those listed above, [17][18][19][20][21] which the interested reader can find in the reference lists of Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Those studies include B-spline R-matrix (BSR) calculations from the Drake University group, [17][18][19] convergent close coupling (CCC) calculations from Curtin University, [18][19][20] and an optical potential (OP) variant 21 on what we report here. Note that there are many more earlier theoretical studies apart from those listed above, [17][18][19][20][21] which the interested reader can find in the reference lists of Refs. 17-21. Of course, at least in part, what made Mg attractive to study is that it can be considered as a quasi-two-electron system, and so, for the theorists, it remained tractable to full quantum mechanical treatments using developed computational methods.…”

Section: Introductionmentioning

confidence: 99%

Integral Cross Sections for Electron–Magnesium Scattering Over a Broad Energy Range (0–5000 eV)

McEachran

Blanco

Garcı́a

et al. 2018

Journal of Physical and Chemical Reference Data

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We report the results from the application of our optical potential and relativistic optical potential (ROP) methods to electron-magnesium scattering. The energy range of this study was 0-5000 eV, with the results for the integral elastic cross sections, summed discrete electronic-state excitation integral cross sections, momentum transfer cross sections, and total ionisation cross sections being reported. Where possible, we compare the present results to the available experimental data and to the earlier results from close coupling and R-matrix type computations. Typically, a quite fair level of accord is found between our ROP calculations and the earlier theoretical and experimental cross sections. Additionally, from the assembled database, we provide for the modeling community some recommended cross section sets for use in their simulations, in which magnesium is a constituent. Electron transport coefficients are subsequently calculated for reduced electric fields ranging from 0.1 to 1000 Td using a multiterm solution of Boltzmann's equation. Substantial differences in the transport coefficients between the ROP calculations and the recommended cross sections are observed over the range of fields considered, clearly illustrating the importance of the veracity of the database in the simulations.

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Calculation of electron-impact ionization of Mg andAl+

Cited by 6 publications

References 34 publications

Calculations for electron-impact excitation and ionization of beryllium

Calculations for electron-impact excitation and ionization of beryllium

Inelastic e+Mg collision data and its impact on modelling stellar and supernova spectra

Integral Cross Sections for Electron–Magnesium Scattering Over a Broad Energy Range (0–5000 eV)

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