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Hake, R. D.; Phelps, A. V.

doi:10.1103/physrev.158.70

Cited by 506 publications

(165 citation statements)

References 87 publications

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“…Below the resonance region, the present cross section is in reasonable agreement with that of Sohn et al [12]. It is, however, nearly twice as high as the cross section derived from transport phenomena by Hake and Phelps [18]. This discrepancy between swarm and beam data was already noted by Schulz [4], and Sohn et al [12].…”

Section: B Integral Cross Sectionssupporting

confidence: 91%

“…It is in excellent agreement with the integral cross sections of Gibson et al [13]. Also shown is the data of Gibson et al [13], Sohn et al [12], Hake and Phelps [18] (from drift velocity measurements, shown 5× vertically expanded), and Morgan [26] (theory).…”

Section: B Integral Cross Sectionssupporting

confidence: 87%

“…Momentum-transfer and inelastic-collision cross sections were calculated from measured values of the electron drift velocity by Hake and Phelps [18] and later by Land [19]. Grand total cross sections are also relevant to the present work in the sense that they can be compared to the sum of the present partial (elastic + vibrational excitation up to v = 11) integral cross sections.…”

Section: Introductionmentioning

confidence: 99%

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Electron collisions with CO: Elastic and vibrational excitation cross sections

Allan

2010

Phys. Rev. A

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Absolute differential elastic and vibrational excitation cross sections up to v = 11 were measured for CO in scattering angle ranges extending to 180 • at energies between 0.2 and 5 eV (and an elastic measurement at 10 eV). The lowest angles were 0 • for inelastic scattering and between 5 • and 20 • for elastic scattering, depending on energy. Integral cross sections were derived by integrating under the angular distributions and compared with previous beam and swarm measurements. The sum of the integral cross sections agrees very well with the available transmission measurements of the grand total cross section, thus validating the present measurements. The present elastic differential and integral cross sections are in excellent agreement with the best available measurement [Gibson et al., J. Phys. B 29, 3197 (1996)], but the v = 1 inelastic cross section is about 25% higher. This could have consequences for simulations of cometary and planetary atmospheres.

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Section: B Integral Cross Sectionssupporting

confidence: 91%

Section: B Integral Cross Sectionssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Electron collisions with CO: Elastic and vibrational excitation cross sections

Allan

2010

Phys. Rev. A

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“…In Fig. 5 we now compare our theoretical and experimental ICS results for the SR continuum against the earlier crossed-beam data of Wakiya, Shyn et al 23 28 Also plotted are some impact parameter theoretical results from Laricchiuta et al 29 and Garrett et al 30 and a Born-Ochkur level computation from Chung and Lin. 31 It is clear from Fig.…”

Section: Resultsmentioning

confidence: 87%

“…In addition, ICSs for this excitation process have been reported by Lassettre et al, 26 Newell et al, 27 , and from an electronswarm analysis by Hake and Phelps. 28 Impact parameter ICS calculations due to Laricchiuta et al 29 32 We note that no theoretical DCS results currently appear to exist for excitation of both the LB and SB transitions, as well as for the SR continuum. With regard to the ICSs, we only have experimental results from Trajmar et al, Newell et al, and Shyn et al 32 and a BEf-scaling theoretical result from Xu et al As we shall see later, agreement between these various data and the data and theory, for each of the SR, LB, and SB excitation processes, is often quite marginal.…”

Section: Introductionmentioning

confidence: 90%

Electron excitation of the Schumann–Runge continuum, longest band, and second band electronic states in O2

Suzuki

Kato

Ohkawa

et al. 2011

The Journal of Chemical Physics

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We report measurements of differential and integral cross sections for electron excitation of the Schumann–Runge continuum, longest band, and second band electronic states in molecular oxygen. The energy range of the present study is 15–200 eV, with the angular range of the differential cross section (DCS) measurements from 2 to 130°. A generalized oscillator strength analysis is then employed in order to derive integral cross sections (ICSs) from the corresponding DCSs, and these ICSs are compared with relevant energy and oscillator strength scaled Born cross section (BEf-scaling [Y.-K. Kim, J. Chem. Phys. 126, 064305 (2007)]) results determined as a part of this investigation. Interestingly, while the present Schumann–Runge continuum and second band ICSs were in reasonable agreement with the respective BEf-scaling results, agreement for the longest band was poor below 100 eV with a possible reason for this apparently anomalous behavior being canvassed here. Finally, where possible all present data are compared with the results from earlier measurements and calculations with the level of agreement found being very good in some cases and marginal in others.

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Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients

et al. 2015

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Electromagnetic pulse (EMP) events produce low‐energy conduction electrons from Compton electron or photoelectron ionizations with air. It is important to understand how conduction electrons interact with air in order to accurately predict EMP evolution and propagation. An electron swarm model can be used to monitor the time evolution of conduction electrons in an environment characterized by electric field and pressure. Here a swarm model is developed that is based on the coupled ordinary differential equations (ODEs) described by Higgins et al. (1973), hereinafter HLO. The ODEs characterize the swarm electric field, electron temperature, electron number density, and drift velocity. Important swarm parameters, the momentum transfer collision frequency, energy transfer collision frequency, and ionization rate, are calculated and compared to the previously reported fitted functions given in HLO. These swarm parameters are found using BOLSIG+, a two term Boltzmann solver developed by Hagelaar and Pitchford (2005), which utilizes updated cross sections from the LXcat website created by Pancheshnyi et al. (2012). We validate the swarm model by comparing to experimental effective ionization coefficient data in Dutton (1975) and drift velocity data in Ruiz‐Vargas et al. (2010). In addition, we report on electron equilibrium temperatures and times for a uniform electric field of 1 StatV/cm for atmospheric heights from 0 to 40 km. It is shown that the equilibrium temperature and time are sensitive to the modifications in the collision frequencies and ionization rate based on the updated electron interaction cross sections.

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Momentum-Transfer and Inelastic-Collision Cross Sections for Electrons inO2, CO, and CO2

Cited by 506 publications

References 87 publications

Electron collisions with CO: Elastic and vibrational excitation cross sections

Electron collisions with CO: Elastic and vibrational excitation cross sections

Electron excitation of the Schumann–Runge continuum, longest band, and second band electronic states in O2

Determination of equilibrium electron temperature and times using an electron swarm model with BOLSIG+ calculated collision frequencies and rate coefficients

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