Recent experiments on near-threshold electron-impact excitation of multiply charged ions

Bannister, M. E.; Djurić, N.; Woitke, O.; Dunn, G. H.; Chung, Y.; Smith, A. C. H.; Wallbank, B.

doi:10.1063/1.56562

Cited by 4 publications

(5 citation statements)

References 4 publications

(6 reference statements)

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“…In figure 1, we show the cross sections for this transition in C 3+ in the threshold region; we compare the cross sections from our three calculations with the RMPS calculation for this transition reported in the paper by Janzen et al [8] and various experimental measurements. In (a), the theoretical cross sections are convoluted with a 1.74 eV Gaussian, which is the electron-energy spread for the measurements of Janzen et al [8]; also shown in (a) are the measurements of Taylor [8] which in (a) is convoluted with a 1.74 eV Gaussian and in (b) is convoluted with a 0.17 eV Gaussian; the solid circles are the measurements of Janzen et al [8]; the solid diamonds are the measurements of Taylor et al [17] the open circles are the measurements of Greenwood et al [19]; and the open diamonds are the measurements of Bannister et al [18].…”

Section: Resultsmentioning

confidence: 99%

“…et al [17], for which the electron-energy spread is actually 2.3 eV. In (b), the theoretical cross sections are convoluted with a 0.17 eV Gaussian, which is the electron-energy spread for the measurements of Bannister et al [18] and Greenwood et al [19]. The cross section from the 9-state R-matrix calculation of Burke [6] for this transition is indistinguishable from the cross section determined from our 9-state R-matrix calculation on the scale of these graphs.…”

Section: Resultsmentioning

confidence: 99%

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Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states

Griffin

Badnell

Pindzola

2000

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

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We have carried out extensive R-matrix close-coupling calculations of the electronimpact excitation of C 3+ and O 5+ . We have determined effective collision strengths for transitions between the lowest nine terms and cross sections between the ground state and selected excited terms of these ions from 41-state R-matrix with pseudo-states (RMPS) calculations that employ basis sets consisting of nine physical states and 32 pseudo-states. In order to investigate the dependence of electron-impact excitation on coupling of the bound states to the target continuum states and also the highly excited bound states included in these RMPS calculations, we have compared these results with those determined from our 9-state and 13-state R-matrix calculations without pseudostates. As one would expect, this additional coupling is in general less important in O 5+ than in C 3+ ; however, these effects vary significantly with the type of transition and are complicated by the resonance contributions. This makes it difficult to draw any general conclusions regarding their dependence on ionization stage. These results complement earlier work on the Li-like ions Be + and B 2+ and provide improved sets of excitation data for these ions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states

Griffin

Badnell

Pindzola

2000

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

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“…For C 3+ , experimental cross sections measured by Bannister et al [17], Greenwood et al. [18], and Janzen et al [19] were reported for the 2s 2 S→2p 2 P excitation.…”

Section: Electron-impact Excitation Of Carbon Ions and Atomsmentioning

confidence: 98%

Cross section database for carbon atoms and ions: Electron-impact ionization, excitation, and charge exchange in collisions with hydrogen atoms

Suno

Katō

2006

Atomic Data and Nuclear Data Tables

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“…The MEIBEL technique has resulted in the measurement of total absolute excitation cross sections [12,[79][80][81][82][83][84][85][86] for a number of optically allowed transitions for both singly-and multiplycharged ions. More importantly, it has yielded cross sections for several intercombination transitions [81][82][83][84][85]87].…”

Section: Trochoidal Merging Of Beams: Electron-ion Excitationmentioning

confidence: 99%

“…Figure 11 presents cross sections [86] for 2s 2 S → 2p 2 P excitation of C 3+ by electron impact. This dipole-allowed process was measured in 1977 [90] and in 1995 [91] using the crossed-beams fluorescence method.…”

Section: Electron-impact Excitation Of Ions Using Meibelmentioning

confidence: 99%

Merged-beams experiments in atomic and molecular physics

et al. 1999

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The merged-beams technique is powerful for the experimental study of certain classes of atomic and molecular processes that cannot be as readily or accurately addressed by other methods. The principal advantages of the technique are the ability to make quantitative studies of collisional interactions with high resolution at low relative energies, to collect products that have undergone appreciable angular scattering, and to investigate processes involving short-lived or chemically-reactive species. Despite continuing advances in ion-source and particle-beam technologies, merged-beams experiments remain a challenge, constituting a relatively small but growing fraction of the worldwide effort in atomic and molecular collisions research. This review outlines the fundamental principles of the merged-beams method, reviews techniques and progress, and focuses on three active programs to highlight the advantages of the method for addressing fundamental questions in atomic and molecular physics.

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Recent experiments on near-threshold electron-impact excitation of multiply charged ions

Cited by 4 publications

References 4 publications

Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states

Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states

Cross section database for carbon atoms and ions: Electron-impact ionization, excitation, and charge exchange in collisions with hydrogen atoms

Merged-beams experiments in atomic and molecular physics

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Recent experiments on near-threshold electron-impact excitation of multiply charged ions

Cited by 4 publications

References 4 publications

Electron-impact excitation of C3+and O5+: the effects of coupling to the target continuum states

Electron-impact excitation of C3+and O5+: the effects of coupling to the target continuum states

Cross section database for carbon atoms and ions: Electron-impact ionization, excitation, and charge exchange in collisions with hydrogen atoms

Merged-beams experiments in atomic and molecular physics

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Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states

Electron-impact excitation of C³⁺and O⁵⁺: the effects of coupling to the target continuum states