Resonance structure in the electron-impact excitation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ca</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>below the 5<i>s</i>threshold

Zatsarinny, Oleg; Lengyel, V.; Masalovich, E. A.

doi:10.1103/physreva.44.7343

Cited by 16 publications

(18 citation statements)

References 29 publications

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“…Various calculations of collision strengths have been performed for the resonance transitions in Ca ii (see Zatsarinny et al 1991;Chidichimo 1981;Kennedy et al 1978;Saraph 1970). Osterbrock & Wallace (1977) derived effective collision strengths from experimental cross sections of the resonance K and H lines of Ca ii at 3934 and 3968 Å by Taylor & Dunn (1973).…”

Section: Introductionmentioning

confidence: 99%

Atomic data from the IRON project

Meléndez

Bautista²,

Badnell

2007

A&A

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Aims. This work reports radiative transition rates and electron impact excitation rate coefficients for levels of the n = 3, 4, 5, 6, 7, 8 configurations of Ca ii.Methods. The radiative data were computed using the Thomas-Fermi-Dirac central potential method in the frozen core approximation and includes the polarization interaction between the valence electron and the core using a model potential. This method allows for configuration interactions (CI) and relativistic effects in the Breit-Pauli formalism. Collision strengths in LS-coupling were calculated in the close coupling approximation with the R-matrix method. Then, fine structure collision strengths were obtained by means of the intermediate-coupling frame transformation (ICFT) method which accounts for spin-orbit coupling effects.Results. We present extensive comparisons with the most recent calculations and measurements for Ca ii as well as a comparison between the core polarization results and the "unpolarized" values. We find that core polarization affects the computed lifetimes by up to 20%. Our results are in very close agreement with recent measurements for the lifetimes of metastable levels. The present collision strengths were integrated over a Maxwellian distribution of electron energies and the resulting effective collision strengths are given for a wide range of temperatures. Our effective collision strengths for the resonance transitions are within ∼11% from previous values derived from experimental measurements, but disagree with later computations using the distorted wave approximation.

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Section: Introductionmentioning

confidence: 99%

Atomic data from the IRON project

Meléndez

Bautista²,

Badnell

2007

A&A

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“…with 3s( 1 P)nl series) which may lead to inaccuracies for the latter levels. In this case the 'non-physical' levels should be excluded, for example, by a two-step diagonalization of the Hamiltonian (Zatsarinny et al 1991). In a first step the submatrix associated only with the series converging to the same threshold is diagonalized.…”

Section: P → 3s Excitationmentioning

confidence: 99%

Quantum memory and quantum computations in the optical subradiance regime

Калачев

Samartsev

2005

Quantum Electron.

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We have investigated the ejected-electron spectrum following impact excitation and ionization of laser-excited Na * (nl) atoms by 1.5 keV electrons. By means of two-laser excitation 3s → 3p 3/2 → 7d and subsequent cascading transitions about 8% (4%) of the target atoms were in excited states with n > 3 (7d). The experimental ejected-electron spectrum due to the decay of Auger and autoionization states of laser-excited atoms Na * (nl) with n = 4-7 has been fully interpreted by comprehensive calculations of the energies, cross sections and decay probabilities of the corresponding states. The various processes contributing to the ejected-electron spectrum are with decreasing magnitude: 2s ionization leading to 2s2p 6 nl Auger states, 2p → 3s excitation leading to 2p 5 3s( 1 P)nl autoionization states and 2s → 3l excitation leading to 2s2p 6 3l ( 1 L)nl autoionization states.

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“…Furthermore, our results (found in ICCNR method) for Ca atom are compered with experimental and theoretical investigations [52][53][54].…”

Section: Motivation and Goalsmentioning

confidence: 99%

“…As one can see in the literature, beryllium , magnesium [15,16,18,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] and calcium [52][53][54][55][56][57][58] 2 Few other well-defined and popular methods of atomic characteristics calculations…”

Section: Introductionmentioning

confidence: 99%

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The Method of Interacting Configurations in Complex Number Representations: From Helium to the Complex Atoms

Simulik¹,

Tymchyk²,

Zajac³

2017

ujpa

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The transition from the He atom to the complex atoms description in the method of interacting configurations in the complex number representation has been presented. As a first step the problem of ionization of H − and Li + ions is considered. The spectroscopic characteristics of the Be, Mg and Ca atoms in the problem of the electron-impact ionization of these atoms are investigated. Few results in the photoionization problem on the 1 P autoionizing states above the n=2 threshold of helium-like Be ++ ion are presented. The energies and the widths of the lowest 1 S, 1 P, 1 D, and 1 F autoionizing states of the Be, Mg atoms, and the lowest ( 1 P ) autoionizing states of Ca atom, are calculated. We consider briefly both a review of our previous results (together with results of other authors) and new calculations of our group. A brief review of the methods of the quasi-stationary states calculation is given.

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Resonance structure in the electron-impact excitation ofCa+below the 5sthreshold

Cited by 16 publications

References 29 publications

Atomic data from the IRON project

Atomic data from the IRON project

Quantum memory and quantum computations in the optical subradiance regime

The Method of Interacting Configurations in Complex Number Representations: From Helium to the Complex Atoms

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