Charge Exchange Cross Sections for Helium Ions in Gases

Barnett, C. F.; Stier, P. M.

doi:10.1103/physrev.109.385

Cited by 122 publications

(46 citation statements)

References 12 publications

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“…(b) Models for an interpolation of the experimental data of nitrogen shown in (a) (see Table IV for references). Puckett et al [15] 180-1000 Rudd et al [43] ( 3 He 2+ ) 30-900 He + Langley et al [41] 133-1000 Pivovar et al [42] 200-1800 Rudd et al [40] 10-2000 Solov'ev et al [44] 15-150 He 0 Puckett et al [15] 150-1000 Solov'ev et al [44] 17 20 Itoh et al [47] 700-2000 Rudd et al [43] ( 3 He 2+ ) 15-450 σ 10 Barnett and Stier [48] 4-200 Gilbody et al [49] 10-200 Itoh et al [47] 700-2000 Rudd et al [40] 5-350 σ 01 Barnett and Stier [48] 4-200 Gilbody et al [50] 60-350 Hvelplund and Horsdal Pedersen [51] 100-4000 Itoh et al [52] 700-2000 σ 02 Hvelplund and Horsdal Pedersen [51] 100-4000 Itoh et al [52] 700-2000 σ 12 Itoh et al [52] 700-2000 Rudd et al [40] 5-350 Equilibrium f 0 ,f 1 ,f 2 of helium charge states Barnett and Stier [48] 4-200 Pivovar et al [53] 300-1000 Model functions Phenomenological functions (Appendix E) the ionization cross sections for He 2+ and He + ions are lower than the respective cross sections for the production of positive charges. This is because positively charged target ions may be left behind, due to ionization of the target molecules by electron capture of the projectile.…”

Section: Ionization Cross Sectionsmentioning

confidence: 99%

“…The best-fit model functions obtained for the equilibrium fractions of helium charge states measured by Barnett and Stier as well as Pivovar et al [48,53] …”

Section: Appendix E: Phenomenological Models For Ionization and Chargmentioning

confidence: 99%

“…In an early publication, Barnett and Stier [48] measured the cross sections σ 10 and σ 01 , using the initial growth method. Their results are approximately two times lower than those reported by other authors.…”

Section: Charge-transfer Cross Sectionsmentioning

confidence: 99%

“…In order to test the consistency of these fitted cross sections, the equilibrium fractions f 0 , f 1 , and f 2 (which correspond to the three helium charge states He 0 , He + , and He 2+ , respectively), as measured by Barnett and Stier [48] and Pivovar et al [53], were compared to the charge-transfer cross section data calculated using Eq. (3).…”

Section: Charge-transfer Cross Sectionsmentioning

confidence: 99%

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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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Section: Ionization Cross Sectionsmentioning

confidence: 99%

“…The best-fit model functions obtained for the equilibrium fractions of helium charge states measured by Barnett and Stier as well as Pivovar et al [48,53] …”

Section: Appendix E: Phenomenological Models For Ionization and Chargmentioning

confidence: 99%

Section: Charge-transfer Cross Sectionsmentioning

confidence: 99%

Section: Charge-transfer Cross Sectionsmentioning

confidence: 99%

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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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“…1.5-3. 8 Chkuaseli et al (20) h and Kr ions at selected velocities were also taken. Because of this mass of data, certain regularities can be detected which will be developed below.…”

Section: Symmetrical Resonancementioning

confidence: 99%

Analysis and Modelling of the Data on Charge Exchange Cross Sections

Florance¹

1964

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Imaging the Global Distribution of Plasmaspheric Oxygen

et al. 2018

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This paper investigates the potential for 83.4 nm imaging of the plasmaspheric dense oxygen torus, using simple models for core plasma density and composition to constrain a simulated image code. We derive the requirements for plasmaspheric O+ imaging, and the expected performance of an imager based on a slightly modified version of the IMAGE extreme ultraviolet camera. We find that such an imager can achieve a sensitivity of 0.69(s R pixel)−1, sufficient to capture the dense torus 83.4 nm signal with 25 min integration time. The background rejection ratios for this design are 1.5 × 10−4 at 58.4 nm and 7.4 × 10−8 for Lyman‐α. We discuss the effects of ion temperature and motion, and O++ glow. We compute simulated O+ images of the formation and global distribution of the dense torus. We also examine the possibility of direct observation of oxygen outflow from the ionosphere.

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Charge Exchange Cross Sections for Helium Ions in Gases

Cited by 122 publications

References 12 publications

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

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

Analysis and Modelling of the Data on Charge Exchange Cross Sections

Imaging the Global Distribution of Plasmaspheric Oxygen

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