Electron-capture collisions at keV energies of boron and other multiply charged ions with atoms and molecules. I. Ar,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, and He

Gardner, L. D.; Bayfield, J. E.; Koch, Peter; Sellin, I. A.; Pegg, D. J.; Peterson, R. S.; Mallory, M. L.; Crandall, D. H.

doi:10.1103/physreva.20.766

Cited by 49 publications

(6 citation statements)

References 40 publications

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“…These are to be compared to the present measured result at 7 keV q of (1.34 ± 0.09) × 10 −15 cm 2 . Furthermore, the ratio of the single-electron-capture cross section for O 6+ impact of He to that for H 2 was found to be 0.29 ± 0.04 [34], with a ratio of 0.33 ± 0.07 extracted from earlier work [25,35] considered (8 keV q). A ratio of 0.32 ± 0.03 is found in the present work at 7 keV q.…”

Section: A Measurement and Calculation Of Total Charge-exchange Crosmentioning

confidence: 95%

“…In particular, measurements in Ref. [34] give the total cross section for single-electron capture in 8-keV q O 6+ + He collisions to be (1.04 ± 0.28) × 10 −15 cm 2 and cite earlier work giving a value of (1.18 ± 0.18) × 10 −15 cm 2 [25]. These are to be compared to the present measured result at 7 keV q of (1.34 ± 0.09) × 10 −15 cm 2 .…”

Section: A Measurement and Calculation Of Total Charge-exchange Crosmentioning

confidence: 98%

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Measurement and calculation of absolute single- and double-charge-exchange cross sections forO6+ions at 1.17 and 2.33 keV/u impacting He andH2

et al. 2014

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Absolute single-and double-charge-exchange cross sections for the astrophysically prominent O 6+ ion with the atomic and molecular targets He and H 2 are reported. These collisions give rise to x-ray emissions in the interplanetary medium, planetary atmospheres, and comets as they approach the sun. Measurements have been carried out using the Caltech Jet Propulsion Laboratory electron cyclotron resonance ion source with O 6+ at energies of 1.17 and 2.33 keV/u characteristic of the slow and fast components of the solar wind. Absolute charge-exchange (CE) data are derived from knowledge of the target gas pressure, target path length, incident ion current, and charge-exchanged ion currents. These data are compared with results obtained using the n-electron classical trajectory Monte Carlo method. The radiative and Auger evolution of ion populations following oneand two-electron transfers is calculated with the time-dependent collisional-radiative code NOMAD using atomic data from the flexible atomic code. Calculated CE emission spectra for 100Å < λ < 1400Å are reported as well and compared with experimental sublevel spectra and cross sections.

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Section: A Measurement and Calculation Of Total Charge-exchange Crosmentioning

confidence: 95%

Section: A Measurement and Calculation Of Total Charge-exchange Crosmentioning

confidence: 98%

Measurement and calculation of absolute single- and double-charge-exchange cross sections forO6+ions at 1.17 and 2.33 keV/u impacting He andH2

et al. 2014

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“…Figure 2 shows a schematic of the apparatus used to measure the ion beam metastable fractions via beam attenuation. Helium was chosen as the attenuation gas based on sparsely available capture cross section data (Gardner et al 1979;Phaneuf et al 1985;Unterreiter et al 1991;Ishii et al 2004), which suggested that the metastable capture cross section, at the experimental ion energies used in this study, were in the range of 3Y7 times larger than that of the ground state. It is important to note, however, that these data, with varying levels of metastable contamination, only covered a limited range of energies and provided little information on state-selective capture cross sections.…”

Section: Ion Beam Metastable Fraction Determinationmentioning

confidence: 98%

Electron‐Impact Ionization of Be‐like Ciii, Niv, and Ov

Fogle

Bahati

Bannister

et al. 2008

ASTROPHYS J SUPPL S

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We present recent measurements of absolute electron-impact ionization cross sections for Be-like C iii, N iv, and O v forming Li-like C iv, N v, and O vi. The measurements were taken using the crossed-beams apparatus at Oak Ridge National Laboratory. A gas cell beam attenuation method was used to independently measure the metastable fractions present in the ion beams. The measured ionization cross sections were compared with calculations using the R-matrix with pseudostates and distorted-wave theoretical methods. Best agreement is found with the R-matrix with pseudostates cross sections results that account for the metastable fractions inferred from the gas attenuation measurements. We present a set of recommended rate coefficients for electron-impact single ionization from the ground state and metastable term of each ion.

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“…5 with the experimental studies of Zwally and Cable [31], Crandall [32], Gardner et al. [33], and Iwai et al [34], and with the theoretical results of Shipsey, Browne, and Olson [35], and of Crandall [32] for the remote capture of two electrons. Note in this figure the similar velocity dependence between these sets of data, especially the experimental ones.…”

Section: )mentioning

confidence: 60%

Theoretical charge-exchange Galilean invariant cross sections for theB3++He collision

López‐Castillo

Ornellas

1995

Phys. Rev. A

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Galilean invariant cross sections were calculated for one-electron capture in collisions of B + with He at velocities between 0.063 and 0.63 a.u. The collision was described within the framework of the perturbed stationary-state approach with the potential-energy curves and nonadiabatic couplings computed with highly correlated configuration-interaction wave functions. A procedure was also proposed to incorporate Galilean invariance without the explicit calculation of translation factors and a method developed to solve the coupling integrals. Cross-section results are in good agreement with existing experimental and theoretical data.PACS number(s): 34.70.+e, 34.10.+x, 03.65.Sq

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Electron-capture collisions at keV energies of boron and other multiply charged ions with atoms and molecules. I. Ar,H2, and He

Cited by 49 publications

References 40 publications

Measurement and calculation of absolute single- and double-charge-exchange cross sections forO6+ions at 1.17 and 2.33 keV/u impacting He andH2

Measurement and calculation of absolute single- and double-charge-exchange cross sections forO6+ions at 1.17 and 2.33 keV/u impacting He andH2

Electron‐Impact Ionization of Be‐like Ciii, Niv, and Ov

Theoretical charge-exchange Galilean invariant cross sections for theB3++He collision

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