Cross sections for one-electron capture by highly stripped ions of B, C, N, O, F, Ne, and S from He below 1 keV/amu

Iwai, Tsuruji; Kaneko, Yozaburo; Kimura, Masahiro; Kobayashi, Nobuo; Ohtani, S.; Okuno, K.; Shoji, T.; Tawara, H.; Tsurubuchi, Seiji

doi:10.1103/physreva.26.105

Cited by 129 publications

(35 citation statements)

References 22 publications

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“…1 shows that our results increase faster than those of Gargaud and co-workers. An extrapolation of these results for higher energies can show that the ab-initio cross section calculated in the present work will match the experimental results of Iwai and co-workers 20 . This can also be observed in the work of López-Castillo and Ornellas 16 where they used a colinear classical path method.…”

Section: Resultssupporting

confidence: 77%

“…Nevertheless, their calculations are in fair agreement with experimental cross sections, but some experimental data 18,19 are overestimated. The agreement is almost qualitative, but it is quite consistent with the subsequent experimental results of the Iwai et al 20 This paper aims to calculate the state-to-state total cross sections for the above process, in the collision energy ranging from 1 eV to 102 eV and using the renormalized Fox-Goodwin method as given by Braga and Belchior 21 . The latter method provides a powerfull tool to propagate the radial wavefunction with the intermolecular potential in an adiabatic basis.…”

Section: Introductionsupporting

confidence: 63%

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Quantum Charge Transfer Study of Triply Charged Ions in the Adiabatic Representation: the (BHe)3+ System

López‐Castillo¹,

Belchior²,

Braga³

1998

J. Braz. Chem. Soc.

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O estudo quântico do processo B 3+ + He → B 2+ + He + foi investigado para energias de colisão variando de 1-102 eV usando um potencial de interação ab-initio. Um método novo foi usado para resolver a equação de Schrödinger na base adiabática, onde os acoplamentos rotacional e radial foram considerados. Além disso, uma discussão sobre os acoplamentos de diferentes simetrias é apresentada. Usando o modelo de Landau-Zenner, mostramos que o modelo de dois estados não deve ser usado para este sistema. Este estudo poderia indicar que tal modelo deve ser usado cuidadosamente para outros sistemas onde o processo de transferência de carga seja considerado. Finalmente, as seções de choque total quântica foram comparadas com trabalhos publicados anteriormente por Gargaud e co-autores e uma concordância razoável foi observada.Full quantum charge transfer study of the process B 3+ + He → B 2+ + He + has been investigated in the collision energy range 1-102 eV using an ab-initio interaction potential. A new method to solve the Schrödinger equation in an adiabatic basis was used, where the radial and rotational coupling were taken into account, and the importance of the coupling between states of different symmetry was discussed. Moreover, by using the well known Landau-Zener model, it was concluded that the two state model cannot be applied for the present system, and this might indicate that such a model should be applied carefully for other systems when a charge transfer process is considered. Finally, the quantum total cross sections were compared with the previous published work of Gargaud and co-workers and a fair agreement was achieved.

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Section: Resultssupporting

confidence: 77%

Section: Introductionsupporting

confidence: 63%

Quantum Charge Transfer Study of Triply Charged Ions in the Adiabatic Representation: the (BHe)3+ System

López‐Castillo¹,

Belchior²,

Braga³

1998

J. Braz. Chem. Soc.

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“…Slow and Fast Solar Wind Parameters. Cross sections for CX between SW heavy ions and H and He are based on theoretical and experimental work of (Beijers et al 1994;Bliman et al 1992;Bonnet et al 1985;Dijkkamp et al 1985a,b;Fritsch et al 1996;Greenwood et al 2001;Harel et al 1992Harel et al , 1998Ishii et al 2004;Iwai et al 1982;Lee et al 2004;Liu et al 2005;Phaneuf et al 1987;Richter et al 1993;Shimakura et al 1992;Suraud et al 1991;Wu et al 1994 work is, however, certainly needed to improve the accuracy of the helium ionization rate of helium ).…”

Section: Hydrogen and Helium Density Gridsmentioning

confidence: 99%

Charge-transfer induced EUV and soft X-ray emissions in the heliosphere

Koutroumpa¹,

Lallement²,

Kharchenko

et al. 2006

A&A

106

170

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Aims. We study the EUV/soft X-ray emission generated by charge transfer between solar wind heavy ions and interstellar neutral atoms and variations of the X-ray intensities and spectra with the line of sight direction, the observer location, the solar cycle phase and the solar wind anisotropies, and a temporary enhancement of the solar wind similar to the event observed by Snowden et al. (2004) during the XMM-Hubble Deep Field North exposure. Methods. Using recent observations of the neutral atoms combined with updated cross-sections and cascading photon spectra we have computed self-consistent distributions of interstellar hydrogen, helium and highly charged solar wind ions for a stationary solar wind and we have constructed monochromatic emission maps and spectra. We have evaluated separately the contribution of the heliosheath and heliotail, and included X-ray emission of the excited solar wind ions produced in sequential collisions to the signal. Results. In most practicable observations, the low and medium latitude X-ray emission is significantly higher at minimum activity than at maximum, especially around December. This occurs due to a strong depletion of neutrals during the high activity phase, which is not compensated by an increase of the solar wind flux. For high latitudes the emission depends on the ion species in a complex way. Intensity maps are in general significantly different for observations separated by six-month intervals. Secondary ions are found to make a negligible contribution to the X-ray line of sight intensities, because their density becomes significant only at large distances. The contribution of the heliosheath-heliotail is always smaller than 5%. We can reproduce both the intensity range and the temporal variation of the XMM-HDFN emission lines in the 0.52-0.75 keV interval, using a simple enhanced solar wind spiral stream. This suggests a dominant heliospheric origin for these lines, before, during and also after the event.

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“…Gardner et al[3] measured the cross sections for SEC in the 0 + +He system at a collision energy of 2.5 keV/u. At energies of 0.47, 0.63, and 0.78 keV/u, Iwai et al[4] reported cross sections for SEC for the same system. Distributions of the captured electrons over the final-state quantum numbers n and l in the 0 +(2snl) state were measured by Kimura et al[5] with a beam spectroscopy method at energy E =0.326 keV/u.…”

mentioning

confidence: 94%

Low-energy collisions ofO5+ions with He atoms: Single-electron capture, projectile excitation, and transfer excitation and ionization

et al. 1995

Self Cite

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A theoretical study of various inelastic processes resulting from collisions of 0 + ions with He atoms is carried out by a semiclassical molecular-orbital expansion method with the inclusion of electron translation factors at collision energies of 60 eV/u to 15 keV/u. In addition to the single-electroncapture process, projectile excitation and transfer excitation and ionization processes are also studied, and the corresponding cross sections are determined. Dominant processes are found to be a singleelectron capture to the 0 +(2s3s} and 0 +(2s3p) states. Other channels are found to make weak but non-negligible contributions. All processes proceed on the outgoing part of the collision, after the transitions from the initial channel to the single-electron-capture channels are completed. Hence, direct processes to projectile excitation and transfer excitation are nearly negligible. The agreement of the present calculation for single-electron capture with measurements is very good.

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Cross sections for one-electron capture by highly stripped ions of B, C, N, O, F, Ne, and S from He below 1 keV/amu

Cited by 129 publications

References 22 publications

Quantum Charge Transfer Study of Triply Charged Ions in the Adiabatic Representation: the (BHe)3+ System

Quantum Charge Transfer Study of Triply Charged Ions in the Adiabatic Representation: the (BHe)3+ System

Charge-transfer induced EUV and soft X-ray emissions in the heliosphere

Low-energy collisions ofO5+ions with He atoms: Single-electron capture, projectile excitation, and transfer excitation and ionization

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