Cross Sections for (Multiple) Ionization of Ions in Collisions with Electrons

Pattard, Thomas; Rost, Jan-Michael

doi:10.1238/physica.topical.080a00295

Cited by 7 publications

(10 citation statements)

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“…It should be noted, however, that only smaller uncertainties and more experimental data points in the near-threshold region, where electron-electron interactions are expected to be most important, could permit a meaningful comparison of the two models and to probe electron-electron correlation effects. A simpler and more straightforward method to determine the dependence of the TS cross sections on the incoming electron energy would have consisted to use very thin targets, i.e., targets with [28,29] and Campos [14] models, respectively. thicknesses in the order of µg/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…(4). As the Campos model is usually employed for the determination of single ionization cross sections, an alternative approach based on the model of Pattard and Rost [28,29] was also probed. In this model the electron-induced multiionization cross section has the following form:…”

Section: B Parametrizationsmentioning

confidence: 99%

“…For the threshold exponent α, a value of 2.2704 was adopted as suggested in Ref. [29] for mid heavy and heavy elements.…”

Section: B Parametrizationsmentioning

confidence: 99%

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DoubleL3Mionization of Pd induced by impact with medium-energy electrons

et al. 2011

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The electron-induced L 3 M two-step double ionization cross sections of metallic Pd were determined experimentally for incident electron beam energies ranging from the double ionization threshold up to 18 keV. The double L 3 M ionization cross sections were derived from the intensity ratios (I LαM :I Lα ) of the resolved M satellites to the parent diagram lines. The sample was bombarded with monoenergetic electrons from an energy-tunable 20-kV electron gun. The diagram and M-satellite x-ray lines were measured by means of high-resolution x-ray spectroscopy, using a reflection-type von Hamos bent crystal spectrometer. The two-step partial cross sections were determined by subtracting from the measured total double ionization cross sections the contributions due to the shake process and L 1 -L 3 M 4,5 Coster-Kronig transitions. Despite the thick target employed in the present study, the dependence of the two-step cross sections on the incoming electron energy could be derived using a target slice decomposition method. It is shown that the obtained energy dependence can be well reproduced by the semiempirical parametrization model of Pattard and Rost.

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Section: Resultsmentioning

confidence: 99%

Section: B Parametrizationsmentioning

confidence: 99%

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DoubleL3Mionization of Pd induced by impact with medium-energy electrons

et al. 2011

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“…As for multiple ionization, it is shown that they can support the prediction by the simplest phase space arguments, namely α ~ n. This will be useful for the prosecution of this work, i.e. the fitting of numerical cross sections with the analytical function by Pattard and Rost (1999). Top, both electrons have the same energy, equal to half the total ionization potential V. Bottom, the two target electrons are given different ionization potentials.…”

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confidence: 79%

Electron impact ionization close to the threshold: classical calculations

Sattin

Katsonis

2003

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

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In this paper we present Classical Trajectory Monte Carlo (CTMC) calculations for single and multiple electron ionization of Argon atoms and ions in the threshold region. We are able to recover the Wannier exponents α for the power-law behavior of the cross section σ versus excess energy: the exact value of the exponent as well as the existence of its saturation for multiple ionization appear to be related to how the total binding energy is shared between target electrons.

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“…Expetimental measurements of C n+ were carried out by Donets and Ovsyamnikov [7] for ionic states n = 1, 2, 3, 4 and 5, in the energy range above 0.1 keV. Cross sections were obtained semi-empirically by Pattard and Rost [8] for C 5+ . Experimental measurements were also performed by Aichele et al [9] for the same species.…”

Section: Electron-impact Ionizationmentioning

confidence: 99%

Recommended Cross Section Data for Carbon Ions and Atoms: Electron-impact Excitation, Ionization and Charge Exchange

Suno

Katō

2007

J. Phys.: Conf. Ser.

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Cross section data have been compiled for electron-impact excitation and ionization of carbon ions C n+ , as well as charge-exchange process between carbon ions and hydrogen atoms. A large amount of theoretical and experimental cross section data have been collected from the litterature, and we have critically assessed their accuracy. The recommended cross sections, the best values for use, are expressed in the form of simple analytical functions. These are also presented in graphical form. In this work, we have treated 76 electronimpact excitation processes for C n+ (n = 5, 4,. .. , 0), electron-impact ionization processes for all of them, and 26 total and state-selective charge exchange processes in H+C n+ processes.

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Cross Sections for (Multiple) Ionization of Ions in Collisions with Electrons

Cited by 7 publications

References 1 publication

DoubleL3Mionization of Pd induced by impact with medium-energy electrons

DoubleL3Mionization of Pd induced by impact with medium-energy electrons

Electron impact ionization close to the threshold: classical calculations

Recommended Cross Section Data for Carbon Ions and Atoms: Electron-impact Excitation, Ionization and Charge Exchange

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