Calculated cross sections for the electron-impact ionization of excited argon atoms using the DM formalism

We used the semi-classical Deutsch-Märk (DM) formalism to calculate absolute electron-impact ionization cross sections of excited Ne atoms from threshold to 1000 eV. Excited states of Ne where the outermost valence electron is excited to states with principal quantum numbers up to n = 7 and orbital angular momentum quantum numbers up to l = 2 have been considered and systematic trends in the calculated cross section data are discussed.

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“…Lastly we note, that trends in the calculated cross sections for Ne are similar to those found earlier in our calculations for Ar [12].…”

Section: Resultssupporting

confidence: 89%

“…Recently, we applied the semi-classical Deutsch-Märk (DM) to the calculation of absolute electron-impact ionization cross sections for excited Ar atoms [12]. In this paper, we extend these calculations to Ne using the most advanced variant of the DM approach [13].…”

Section: Introductionmentioning

confidence: 99%

Calculated Electron Impact Ionization Cross Sections of Excited Ne Atoms Using the DM Formalism

Deutsch

Becker

Grum–Grzhimailo

et al. 2005

Contrib. Plasma Phys.

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“…the length a covalent Table 1. Covalent diameters c [93], diameters calculated from bond lengths and angles b [12,20,44,45], Dirac-Fock outer orbital maxima m [28], kinetic diameters k [6,25,34,42,73,84,96], Deutsch-Märk diameters of excited Ar [29], Hartree-Fock outer orbital maxima of excited Xe [60], molecular weights and mean time τ A * B until an excited A * meets a B molecule. Values for atmospheric pressure and c = 1.…”

Section: Properties Of the Gas Mixtures 21 Collision Frequencymentioning

confidence: 99%

Penning transfer in argon-based gas mixtures

Şahin¹,

Tapan²,

Ozmutlu³

et al. 2010

J. Inst.

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Penning transfers, a group of processes by which excitation energy is used to ionise the gas, increase the gas gain in some detectors. Both the probability that such transfers occur and the mechanism by which the transfer takes place, vary with the gas composition and pressure. With a view to developing a microscopic electron transport model that takes Penning transfers into account, we use this dependence to identify the transfer mechanisms at play. We do this for a number of argon-based gas mixtures, using gain curves from the literature.

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“…Additionally, ionization can take place for electron energies below the threshold for ionization if the target atom is in an excited metastable state [43]. The sum of the electron and excited state energies can be sufficient to cause ionization.…”

Section: Ionizationmentioning

confidence: 99%

“…In the following, we will briefly describe the key points involved in the different interaction phenomena and then use that information to generate a clear phenomenological description of the hollow cathode discharges [41][42][43].…”

Section: Introductionmentioning

confidence: 99%