Ionization of atomic oxygen by protons

Thompson, W R; Shah, M B; Geddes, J; Gilbody, H B

doi:10.1088/0953-4075/30/6/004

Cited by 8 publications

(7 citation statements)

References 7 publications

(8 reference statements)

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“…Previous studies of the p-O collision system, which is of astrophysical interest, include experimental observations of single capture, single ionization, and transfer ionization by 13͔, and a recent model calculation which yielded somewhat satisfactory results for ionization and capture, but not for transfer ionization ͓14͔. In the high-energy limit the ionization data can be compared with experimental electron impact results ͓15͔.…”

Section: Introductionmentioning

confidence: 99%

Quantum-mechanical description of ionization, capture, and excitation in proton collisions with atomic oxygen

et al. 2000

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The basis generator method is used to propagate effective single-particle equations for ion-atom collisions to provide a mean-field description for the proton-oxygen collision system. The pure capture and ionization as well as transfer ionization cross sections are calculated using two alternative prescriptions to extract the physical information from the propagated orbitals. The sensitivity of the resonant single capture cross section to the effective single-particle potential for atomic oxygen is tested. Cross sections are calculated for 1-2000 keV proton impact and good overall agreement is found with available experiments, while some of the results are at variance with a recent model calculation. The single-particle excitation amplitudes are combined in the LS coupling scheme to obtain excitation cross sections for particular atomic oxygen configurations. The latter are compared with recent measurements for proton and electron impact. Reasonable agreement is found for many one-electron excitations and some two-electron processes.

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Section: Introductionmentioning

confidence: 99%

Quantum-mechanical description of ionization, capture, and excitation in proton collisions with atomic oxygen

et al. 2000

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“…After penetrating the plasma fast oxygen atoms are ionized in collisions with plasma particles, in particular with protons, and confined. Following the method used in [14] to estimate beam penetration into a hot plasma, and using ionization cross-section data for particle collisions with oxygen from [23][24][25], plus ionization rate coefficient data for collisions with electrons from [26], the mean-free path for fast oxygen ionization is of the order of 0.7 m (compared to ∼2 m for full-energy hydrogen neutrals) for typical plasma conditions when NBI commences (i.e. line-averaged electron density n e = 6 × 10 18 m −3 and Z eff = 2 with boron being the main impurity [27]).…”

Section: Fast Oxygen Interaction With Plasmamentioning

confidence: 99%

The detection of fast oxygen ions in neutral beam-heated plasmas of the TJ-II stellarator using spectroscopy methods

McCarthy¹,

Tribaldos²,

Arévalo³

et al. 2010

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

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“…Notable examples of results for excitation include proton impact excitation for Be-like (Ryan et al 1998), B-like (Foster et al 1997), C-like (Ryan et al 1999), and Be-like to Cl-like ions . Regarding ionization, the following works are of particular interest: He* + H (Mihajlov et al 1996), H + H (Krstic et al 1996), H+ + 0 (Thompson et al 1997), H+, He 2 +, Li 3 + + H (Toshima 1997), and H+ + H (Shah et al 1998).…”

Section: Ion-atom and Atom-atom Collisionsmentioning

confidence: 99%

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

Rostas¹,

Smith²,

Berrington³

et al. 2000

Trans. Int. Astron. Union

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In recognition of its special interdisciplinary character, IAU Commission 14 is linked directly to the Executive Committee. The Commission’s role is to inform the astronomical community of new developments in the diverse fields of research which involve atoms and molecules. Conversely it endeavors to sensitize the research community active in those fields to the specific needs of astronomy, especially concerning basic data and modeling tools. More generally, Commission 14 tries to foster long term relations and collaborations between the two communities and, when necessary, to alert funding authorities to the specific needs of ground and space based astronomy for specific atomic and molecular data. This report is one of the main contributions of Commission 14 to the information of the astronomical community. Several meetings concerned, at least in part, with the need and availability of atomic and molecular data for astrophysics were also sponsored or co-sponsored. In the last triennium, Commission 14 cosponsored IAU Symposium 194 “Astrochemistry: From Molecular Cloud to Planetary Systems” held in Sogwipo (Korea) from Aug. 23 to 27, 1999 and organized by Commission 34. A Joint Discussion: JD1 on “Atomic and Molecular Data for Astrophysics, New Developments, Case Studies and Future Needs” has been planned for the XXIVth IAU General Assembly in Manchester (Aug. 7-19, 2000) and cosponsored by Commissions 15, 16, 29, 34, 36, 40 and 44. Several other Joint Discussions to be held at the Manchester General Assembly are co-sponsored by this commission.

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Ionization of atomic oxygen by protons

Cited by 8 publications

References 7 publications

Quantum-mechanical description of ionization, capture, and excitation in proton collisions with atomic oxygen

Quantum-mechanical description of ionization, capture, and excitation in proton collisions with atomic oxygen

The detection of fast oxygen ions in neutral beam-heated plasmas of the TJ-II stellarator using spectroscopy methods

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

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