Absolute partial and total electron impact ionization cross sections for C3H8 from threshold up to 950 eV

Grill, V.; Wälder, G.; Margreiter, D.; Rauth, T.; Poll, H.-U.; Scheier, P.; Märk, T.D.

doi:10.1007/bf01426883

Cited by 51 publications

(35 citation statements)

References 23 publications

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“…14 is in good agreement with the experimental data by Durić et al 38 and by Grill et al 41 but somewhat lower than those by Schram et al 37 In Fig. 15, the BEB cross section is compared to the experimental data for C 6 H 6 by Schram et al, 37 which are available only for Tу600 eV.…”

Section: Hydrocarbonssupporting

confidence: 82%

New model for electron-impact ionization cross sections of molecules

Hwang¹,

Kim

Rudd³

1996

The Journal of Chemical Physics

529

362

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A theoretical model for electron-impact ionization cross sections, which has been developed primarily for atoms and atomic ions, is applied to neutral molecules. The new model combines the binary-encounter theory and the Bethe theory for electron-impact ionization, and uses minimal theoretical data for the ground state of the target molecule, which are readily available from public-domain molecular structure codes such as GAMESS. The theory is called the binaryencounter Bethe (BEB) model, and does not, in principle, involve any adjustable parameters. Applications to 19 molecules, including H 2 , NO, CH 2 , C 6 H 6 , and SF 6 , are presented, demonstrating that the BEB model provides total ionization cross sections by electron impact from threshold to several keV with an average accuracy of 15% or better at the cross section peak, except for SiF 3 . The BEB model can be applied to stable molecules as well as to transient radicals. History:Received 13 A theoretical model for electron-impact ionization cross sections, which has been developed primarily for atoms and atomic ions, is applied to neutral molecules. The new model combines the binary-encounter theory and the Bethe theory for electron-impact ionization, and uses minimal theoretical data for the ground state of the target molecule, which are readily available from public-domain molecular structure codes such as GAMESS. The theory is called the binary-encounter Bethe ͑BEB͒ model, and does not, in principle, involve any adjustable parameters. Applications to 19 molecules, including H 2 , NO, CH 2 , C 6 H 6 , and SF 6 , are presented, demonstrating that the BEB model provides total ionization cross sections by electron impact from threshold to several keV with an average accuracy of 15% or better at the cross section peak, except for SiF 3 . The BEB model can be applied to stable molecules as well as to transient radicals.

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Section: Hydrocarbonssupporting

confidence: 82%

New model for electron-impact ionization cross sections of molecules

Hwang¹,

Kim

Rudd³

1996

The Journal of Chemical Physics

529

362

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“…This deviation exceeds the reported experimental uncertainties, which were between 10% and 15% for all experimental data. On the contrary, the cross section data of Grill et al [24] are systematically lower than those of Durić et al (up to 65% below 30 eV), although the discrepancy above 30 eV (approximately 10%) can be considered negligible within the overall uncertainty. Grill et al determined partial ionization cross sections by measuring the number of positively charged molecular fragments, produced by the passage of an electron beam, by means of a mass spectrometer.…”

Section: Methodsmentioning

confidence: 56%

“…Durić et al [21] C H 4 , C 3 H 8 12-240 Grill et al [24] C H 4 15-950 Nishimura et al [23] C H 4 , C 3 H 8 15-3000 Schram et al [22] C H 4 , C 3 H 8 600-12 000 Theoretical De Souza et al [25] C H 4 2-500 Vinodkumar et al [26] C H 4 15-2000 Models BEB model [19] (see Appendix A) Chouki model [27] (see Appendix B) Table I). Error bars are only shown for selected data points to improve readability.…”

Section: Methodsmentioning

confidence: 99%

Ionization cross section data of nitrogen, methane, and propane for light ions and electrons and their suitability for use in track structure simulations

et al. 2013

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Rabus, H. (2013). Ionization cross section data of nitrogen, methane, and propane for light ions and electrons and their suitability for use in track structure simulations. Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, 88 (4), 043308-1-043308-21.Ionization cross section data of nitrogen, methane, and propane for light ions and electrons and their suitability for use in track structure simulations AbstractTrack structure Monte Carlo simulations are frequently applied in micro-and nanodosimetry to calculate the radiation transport in detail. The use of a well-validated set of cross section data in such simulation codes ensures accurate calculations of transport parameters, such as ionization yields. These cross section data are, however, scarce and often discrepant when measured by different groups. This work surveys literature data on ionization and charge-transfer cross sections of nitrogen, methane, and propane for electrons, protons, and helium particles, focusing on the energy range between 100 keV and 20 MeV. Based on the evaluated data, different models for the parametrization of the cross section data are implemented in the code PTRA, developed for simulating proton and alpha particle transport in an ion-counting nanodosimeter. The suitability of the cross section data is investigated by comparing the calculated mean ionization cluster size and energy loss with experimental results in either nitrogen or propane. For protons, generally good agreement between measured and simulated data is found when the Rudd model is used in PTRA. For alpha particles, however, a considerable influence of different parametrizations of cross sections for ionization and charge transfer is observed. The PTRA code using the charge-transfer data is, nevertheless, successfully benchmarked by the experimental data for the calculation of nanodosimetric quantities, but remaining discrepancies still have to be further investigated (up to 13% lower energy loss and 19% lower mean ionization cluster size than in the experiment). A continuation of this work should investigate data for the energy loss per interaction as well as differential cross section data of nitrogen and propane. Interpolation models for ionization and chargetransfer data are proposed. The Barkas model, frequently used for a determination of the effective charge in the ionization cross section, significantly underestimates both the energy loss (by up to 19%) and the mean ionization cluster size (up to 65%) for alpha particles. It is, therefore, not recommended for particle-track simulations. Track structure Monte Carlo simulations are frequently applied in micro-and nanodosimetry to calculate the radiation transport in detail. The use of a well-validated set of cross section data in such simulation codes ensures accurate calculations of transport parameters, such as ionization yields. These cross section data are, however, scarce and often discrepant when measured by different groups. This work surveys literature data on ionization and charge-tra...

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“…38 Infrared assignments for non-crosslinked polybutadiene are as follows: 25,39 CH=CH 2 stretch (3010 cm In all cases, the AFM RMS surface roughness was measured to be less than 17 nm, which confirms the low level of plasmachemical roughening/texturing within the selected downstream plasma glow region due to the lack of surface bombardment by energetic electrical discharge species (e.g. ions), 28,29 Picolitre water droplet impact onto all of these surfaces displayed an initial spreading of the contact line to reach a maximum diameter. In the case of CF 4 plasma fluorinated polybutadiene, this was followed by dissipation of excess surface free energy observed as oscillations of the droplet height (stemming from lower energy dissipation during spreading across a more hydrophobic surface), whilst motion of the contact line was inhibited due to pinning, Figure 4(a).…”

Section: Non-crosslinked Versus Crosslinked Plasma Halogenated Polybumentioning

confidence: 71%

Controlling picolitre droplet impact dynamics by tailoring the solid subsurface

Brown

Talbot

Wood

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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. (2015) 'Controlling picolitre droplet impact dynamics by tailoring the solid subsurface.', Colloids and surfaces A : physiochemical and engineering aspects., 481 . pp. 215-221. Further information on publisher's website:http://dx.doi.org/10. 1016/j.colsurfa.2015.04.047 Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Colloids and surfaces A: physiochemical and engineering aspects. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Colloids and surfaces A: physiochemical and engineering aspects, 481, 20 September 2015481, 20 September , 215221, 10.1016481, 20 September /j.colsurfa.2015 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTThe oscillatory dynamics of picolitre water droplets following impact onto a range of hydrophobic surfaces is found to be influenced by the underlayer stiffness and thickness. The relative contributions of surface functionality versus subsurface hardness have been decoupled by utilising plasmachemical surface functionalisation and underlayer crosslinking respectively. Higher oscillation frequencies are measured for softer and thicker films, which correlates to a larger surface deformation around the liquid droplet contact line.

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Absolute partial and total electron impact ionization cross sections for C3H8 from threshold up to 950 eV

Cited by 51 publications

References 23 publications

New model for electron-impact ionization cross sections of molecules

New model for electron-impact ionization cross sections of molecules

Ionization cross section data of nitrogen, methane, and propane for light ions and electrons and their suitability for use in track structure simulations

Controlling picolitre droplet impact dynamics by tailoring the solid subsurface

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