Multiple ionization of gases by collisions with electrons

Almeida, Diogo; Fontes, A.C.; Pontes, F.C.

doi:10.1016/s0168-583x(98)80005-0

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…The absolute electron data of Rejoub et al [1], Wetzel et al [14], El-Sherbini et al [15], Schram et al [16][17][18], as well as the relative measurements of Krishnakumar and Srivastava [19] normalized to the data from Rapp and Englander-Golden [20], are shown. Although there are several other measurements of multiple ionization of noble gases by electron impact available in the literature, e.g., those of Almeida et al [21,22], we focused our comparison, basically, on those works which reported absolute and independently measured cross sections. Theoretical calculations for electron and proton impact are also included for comparison.…”

Section: Resultsmentioning

confidence: 99%

Absolute cross sections for multiple ionization of noble gases by swift proton impact

Cavalcanti

Sigaud

Montenegro

et al. 2003

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

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Absolute cross sections, σq+, for multiple ionization of He (q = 1), Ne (q = 1, 2, and 3), Ar (q = 1, 2, 3, and 4), Kr (q = 1, 2, 3, and 4), and Xe (q = 1, 2, 3, 4, and 5) atoms by protons in the 0.75–3.5 MeV impact energy range have been measured. The present results are in good agreement with the previously published data in the case of the single-and double-ionization cross sections, but some non-systematic discrepancies appear for higher charge states. A detailed comparison with electron impact cross sections in these gases is performed, and it shows that the cross sections for single ionization by high-velocity protons are substantially smaller than those corresponding to equi-velocity electrons for heavier targets.

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Section: Resultsmentioning

confidence: 99%

Absolute cross sections for multiple ionization of noble gases by swift proton impact

Cavalcanti

Sigaud

Montenegro

et al. 2003

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

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“…Although there is a good agreement between protons and electrons for the light targets, as expected from first-order theories, for Kr and Xe the electron cross sections are about 70% larger than the corresponding proton cross sections. Experimental effort has recently been applied to elucidate the origin of the reported discrepancies occurring in multiple ionization of gases by electrons when measurements by different groups are compared (Almeida et al 1997, Almeida 1999, Chung and Cho 2001. As these discrepancies generally increase with the charge state of the recoil ions, most of these experiments normalize the gross cross sections to previously reported measurements and are focused on the relative distribution for the various charge states.…”

Section: Charge State Hementioning

confidence: 99%

Multiple ionization of noble gases by 2.0 MeV proton impact: comparison with equi-velocity electron impact ionization

Melo

Santos²,

Sant’Anna

et al. 2002

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

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Absolute single- and multiple-ionization cross sections of rare gases (He, Ne, Ar, Kr and Xe) have been measured for collisions with 2.0 MeV p+. A comparison is made with equi-velocity electron impact ionization cross sections as well as with the available proton impact data. For the light rare gases the single-ionization cross sections are essentially the same for both proton and electron impacts, but increasing differences appear for the heavier targets.

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“…The electron impact ionization of atoms has been studied for decades to interpret the underlying atomic processes [1][2][3][4][5][6][7][8][9][10][11]. Ionization by electrons has also been achieved, both experimentally and theoretically, to provide parameters for use in plasma physics, astrophysics, and gas discharge, to name a few.…”

Section: Introductionmentioning

confidence: 99%