Selective electron capture into highly stripped Ne and N target atoms after heavy-ion impact

Mann, R.; Folkmann, F.; Beyer, H F

doi:10.1088/0022-3700/14/7/012

Cited by 146 publications

(27 citation statements)

References 30 publications

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“…Therefore while SEC is recognized as the dominant contributor to x-ray emission, ADC and TDC can also play significant roles. The charge exchange process can be understood quite simply in terms of the classical over-the barrier (COB) model (Ryufuku et al, 1980;Mann et al, 1981). In this picture, the collision partners are represented by Coulomb-like potentials centered at each nucleus and which support a number of bound electronic states.…”

Section: Charge Exchange Processesmentioning

confidence: 99%

“…This is a necessity as it is impractical at the current time to perform explicit measurements or calculations for each relevant set of collision partners. To estimate the total SEC, or q,q-1, cross section, the COB model is often adopted (Ryufuku et al, 1980;Mann et al, 1981). The COB model is parameterized by the incident charge q and the ionization potential of the target I Y giving the cross section…”

Section: Often Adopted Approximationsmentioning

confidence: 99%

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X-ray and extreme ultraviolet emissions from comets

2004

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There is significant progress in the observations, theory, and understanding of the x-ray and EUV emissions from comets since their discovery in 1996. That discovery was so puzzling because comets appear to be more efficient emitters of x-rays than the Moon by a factor of 80 000. The detected emissions are general properties of comets and have been currently detected and analyzed in thirteen comets from five orbiting observatories. The observational studies before 2000 were based on x-ray cameras and low resolution (E/δE ≈ 1.5 -3) instruments and focused on the morphology of xrays, their correlations with gas and dust productions in comets and with the solar x-rays and the solar wind. Even those observations made it possible to choose uniquely charge exchange between the solar wind heavy ions and cometary neutrals as the main excitation process. The recently published spectra are of much better quality and result in the identification of the emissions of the multiply charged ions of O, C, Ne, Mg, and Si which are brought to comets by the solar wind. The observed spectra have been used to study the solar wind composition and its variations. Theoretical analyses of x-ray and EUV photon excitation in comets by charge exchange, scattering of the solar photons by attogram dust particles, energetic electron impact and bremsstrahlung, collisions between cometary and interplanetary dust, and solar x-ray scattering and fluorescence in comets have been made. These analyses confirm charge exchange as the main excitation mechanism, which is responsible for more than 90% of the observed emission, while each of the other processes is limited to a few percent or less. The theory of charge exchange and different methods of calculation for charge exchange are considered. Laboratory studies of charge exchange relevant to the conditions in comets are reviewed. Total and state-selective cross sections of charge exchange measured in the laboratory are tabulated. Simulations of synthetic spectra of charge exchange in comets are discussed. X-ray and EUV emissions from comets are related to different disciplines and fields such as cometary physics, fundamental physics, x-rays spectroscopy, and space physics.

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Section: Charge Exchange Processesmentioning

confidence: 99%

Section: Often Adopted Approximationsmentioning

confidence: 99%

X-ray and extreme ultraviolet emissions from comets

2004

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“…For large enough values of q, the deexcitation transitions lead to the emission of X-ray photons. For species and charge states relevant to comets, the principal quantum number of the ion A (q -1)+ is about n = 4 or 5 (Ryufuku et al, 1980;Mann et al, 1981). The cross section for charge exchange between a high charge state solar wind ion and an ionized coma gas species is negligible in comparison, due to the effects of Coulomb repulsion between the two reactants.…”

Section: Solar Wind Charge Exchange X-ray Mechanismmentioning

confidence: 99%

X-Ray and Extreme Ultraviolet Emission from Comet P/Encke 1997

Lisse

1999

Icarus

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The discovery of high energy X-ray emission in 1996 from C/1996 B2 (Hyakutake) has created a surprising new class of X-ray emitting objects. The original discovery and subsequent detection of X-rays from 17 other comets ( Table 1) have shown that the very soft (E < 1 keV) emission is due to an interaction between the solar wind and the comet's atmosphere, and that X-ray emission is a fundamental property of comets. Theoretical and observational work has demonstrated that charge exchange collisions of highly charged solar wind ions with cometary neutral species is the best explanation for the emission. Now a rapidly changing and expanding field, the study of cometary X-ray emission appears to be able to lead us to a better understanding of a number of physical phenomena: the nature of the cometary coma, other sources of X-ray emission in the solar system, the structure of the solar wind in the heliosphere, and the source of the local soft X-ray background.

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“…The "energy level matching condition" (EM) has been introduced [18,19] and the corresponding critical internuclear distance R EM C is defined as follows:…”

Section: Total Charge Transfer Cross Sectionsmentioning

confidence: 99%

Charge Transfer Cross Sections of Slow Multiply Charged Neon Ions in Collisions with Noble Gas Atoms

Kusakabe

Shirai²

2014

Plasma and Fusion Research

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Single and multiple charge transfer cross sections for Ne q+ (q = 2 -6) ions were measured in collisions with Ne, Ar, Kr, and Xe atoms at 2q keV. Quintuple charge transfer cross sections σ 6,1 were derived for the Ne 6+ + Ne, Ar, and Xe collisions. In Ne atoms, the double, triple, and quadruple charge transfer of Ne 2+ , Ne 3+ , and Ne 4+ ions, respectively, represent so-called symmetric resonant charge transfer processes. The present data for these collisions are in good accordance with the previous data. The scaling properties of the total, single, and multiple charge transfer cross sections were examined, and it was found that the double, triple, and quadruple charge transfer cross sections can be scaled using the second, third, and fourth ionization potentials, respectively.

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Selective electron capture into highly stripped Ne and N target atoms after heavy-ion impact

Cited by 146 publications

References 30 publications

X-ray and extreme ultraviolet emissions from comets

X-ray and extreme ultraviolet emissions from comets

X-Ray and Extreme Ultraviolet Emission from Comet P/Encke 1997

Charge Transfer Cross Sections of Slow Multiply Charged Neon Ions in Collisions with Noble Gas Atoms

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