A measurement of the cross section for electron impact ionisation of Ne+, Ar+, Kr+and Xe+

Man, Kin F.; Smith, A. C. H.; Harrison, Mark

doi:10.1088/0022-3700/20/21/030

Cited by 41 publications

(18 citation statements)

References 21 publications

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“…In order to determine the 40 Ar 2+ at m/z = 20 ( 20 Ne + ), 40 Ar + was measured during Ne isotope ratio analysis and correction made using 40 Ar + / 40 Ar 2+ ratios determined in dynamic mode by peak jumping of m/z = 20 and 40 on the CDD detector. 40 Ar + / 40 Ar 2+ decreases from 3.6 ± 0.1 (60 eV) to 1.9 ± 0.1 (110 eV) with a plateau between 80 and 90 eV at 2.3 ± 0.1, consistent with previous work (Man et al, 1993). It does not appear to be affected by H2 + partial pressure in the mass spectrometer.…”

Section: Isobaric Interferencessupporting

confidence: 89%

The formation of NeH+ in static vacuum mass spectrometers and re-determination of 21Ne/20Ne of air

Gyӧre

Tait

Hamilton

et al. 2019

Geochimica et Cosmochimica Acta

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Highlights-Controls on NeH + formation are determined, and 20 NeH + formation is precisely quantified on the basis of measured 22 NeH +-21 Ne/ 20 Ne of air has been re-determined to be 0.002959 ± 0.000004 (0.14%, 1σ)-The lower uncertainty of air 21 Ne/ 20 Ne and better precision of Ne isotope analyses significantly reduces the uncertainty of Ne concentration measurements, essential for development of cosmogenic and radiogenic dating applications

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Section: Isobaric Interferencessupporting

confidence: 89%

The formation of NeH+ in static vacuum mass spectrometers and re-determination of 21Ne/20Ne of air

Gyӧre

Tait

Hamilton

et al. 2019

Geochimica et Cosmochimica Acta

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“…In fact, electron impact ionization of Ar (reaction 15), with a threshold of E48 eV, 34 is the main source of Ar 2+ in this type of plasmas. 38 The other Ar 2+ source included in the model, namely, electron impact ionization of Ar + (reaction 16) has indeed a lower threshold and a larger cross section, 39 but its contribution to the global production of Ar 2+ is very small, given the low ionic concentrations in the plasma (the concentration of Ar + ions is typically more than five orders of magnitude lower than that of Ar atoms).…”

Section: Resultsmentioning

confidence: 99%

On the ionic chemistry in DC cold plasmas of H2 with Ar

Méndez

Tanarro

Herrero

2010

Phys. Chem. Chem. Phys.

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An experimental diagnosis and kinetic modeling of the ionic chemistry in low pressure DC plasmas of H(2)/Ar has been carried out. The studies were performed at pressures of 2 Pa and 0.7 Pa, in a hollow-cathode discharge reactor, using as plasma precursor a H(2)/Ar mixture with 15% Ar content. Experimental measurements include distributions of ion fluxes to the cathode, as well as electronic temperatures and densities in the plasma glow. Besides the species resulting directly from electron impact ionization (H(+), H(2)(+), Ar(+) and Ar(2+)), the ions H(3)(+) and ArH(+) were found to be formed in large amounts through protonation reactions in the glow. In spite of the not too large variation in the pressure of the two plasmas, the differences in the ion distributions are worth mentioning. In the 2 Pa discharge (but not in the 0.7 Pa), H(3)(+) was the dominant ion and ArH(+) exceeded markedly the Ar(+) signal. On the other hand, the appearance of Ar(2+) in the two plasmas points at the relevance of high energy electrons. The experimental results can be accounted for by a simple kinetic model, after including corrections for the presence of a small fraction (<3%) of high energy (>50 eV) electrons and for the attenuation of the Ar(+) ions in the sheath through asymmetric charge exchange with H(2).

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“…7. The DI normalized cross-section for Ne ii (dashed blue line) and the measurements of Achenbach et al (1984) (red dots), Diserens et al (1984) (green triangle), Donets & Ovsyannikov (1981) (blue square) and Man et al (1987a) (cyan square) with their respective experimental uncertainties.…”

Section: Di: 2p Cross Sectionmentioning

confidence: 99%

X-ray emission from thin plasmas

Urdampilleta

Kaastra

Mehdipour

2017

A&A

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Every observation of astrophysical objects involving a spectrum requires atomic data for the interpretation of line fluxes, line ratios, and ionization state of the emitting plasma. One of the processes that determines it is collisional ionization. In this study, an update of the direct ionization (DI) and excitation-autoionization (EA) processes is discussed for the H to Zn-like isoelectronic sequences. In recent years, new laboratory measurements and theoretical calculations of ionization cross-sections have become available. We provide an extension and update of previous published reviews in the literature. We include the most recent experimental measurements and fit the cross-sections of all individual shells of all ions from H to Zn. These data are described using an extension of Younger's and Mewe's formula, suitable for integration over a Maxwellian velocity distribution to derive the subshell ionization rate coefficients. These ionization rate coefficients are incorporated in the high-resolution plasma code and spectral fitting tool SPEX V3.0.

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A measurement of the cross section for electron impact ionisation of Ne⁺, Ar⁺, Kr⁺and Xe⁺

Cited by 41 publications

References 21 publications

The formation of NeH+ in static vacuum mass spectrometers and re-determination of 21Ne/20Ne of air

The formation of NeH+ in static vacuum mass spectrometers and re-determination of 21Ne/20Ne of air

On the ionic chemistry in DC cold plasmas of H2 with Ar

X-ray emission from thin plasmas

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