Electron Impact Ionization of Plasma Edge Atoms

Märk, T.D.

doi:10.1007/978-1-4757-9319-2_4

Cited by 4 publications

(3 citation statements)

References 96 publications

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“…Inelastic collisions between electrons and molecules are dominated by channels yielding both electrons and positive ions (Märk 1995). Processes of this type occur in low-energy or coldtemperature plasmas, whose industrial and technological applications are of the utmost interest in semiconductor processing, atmospheric chemistry, etc (Becker 1991).…”

Section: Introductionmentioning

confidence: 99%

Electron-impact dissociative ionization of fluoromethanes CHF3 and CF4

Torres

Martı́nez

Castaño

2002

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

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The electron-impact dissociative ionization of fluoromethanes CHF 3 and CF 4 has been investigated by probing their supersonic expansions with a beam of electrons of selected kinetic energy within a time-of-flight mass spectrometer system. Partial (absolute) ionization cross sections of all the nascent ions arising from electron impact, namely CF from CF 4 , were measured for electron incident energies up to 100 eV (nominal). The kinetic energy distributions of the nascent ions were also characterized and the information that they supply combined with the appearance potentials (APs) provides an improved identification of the molecular dissociative ionization channels. The correlation between the channel AP and the character and energies of the precursor molecular orbitals is discussed.

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Section: Introductionmentioning

confidence: 99%

Electron-impact dissociative ionization of fluoromethanes CHF3 and CF4

Torres

Martı́nez

Castaño

2002

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

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“…impact ionization are greatest (see figure 2). We would not expect our fit to reproduce the experimental data as accurately as some more detailed calculations [10,11]. Rather, we wish to reveal the remarkable similarity in the strong correlations between the ionization cross section and threshold energies for both electrons and positrons.…”

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confidence: 93%

“…previous data in the literature. Although most of the differences between sets of experimental results are due to higher-order ionization processes, there are still discrepancies of up to 20% between the results of various experiments [8][9][10]. For this reason we have used several experimental sets of single-ionization cross sections in order to obtain a measure of the uncertainty in our analysis [12][13][14][15][16][17][18].…”

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confidence: 99%

Correlations between ionization cross sections and threshold energies in electron-, positron-, proton- and antiproton-atom collisions

Reeth

Humberston

Laricchia

2001

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

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Strong correlations between the direct single-ionization cross sections and the target ionization energies are found for electron, positron, proton and antiproton impact on the noble gases. These correlations, extending from near threshold to high projectile energies, are similar to those previously observed for positronium formation, namely σ = A exp(−BE th ), where σ is the cross section for each process, E th is the relevant threshold energy and A and B are functions of the excess energy of the projectile. The generality of this form for the four projectiles is suggestive of a common underlying fundamental aspect of the collisions.Recent investigations of positronium (Ps) formation in positron-atom collisions have revealed a strong correlation between the Ps formation cross section σ Ps and the corresponding threshold energy E Ps = (E i − 6.8) eV (E i being the single-ionization threshold of the target and 6.8 eV the binding energy of Ps) [1,2]. The data for Ps formation in single ionization for both the noble gases and the alkalis were shown to fit the relation

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