Measurements of the drift velocity of electrons in mixtures of nitrogen and carbon dioxide from 100 to 1000 Td

Hasegawa, H.; Date, Hiroyuki; Ohmori, Y; Ventzek, Peter L. G.; Shimozuma, M.; Tagashira, Hiroaki

doi:10.1088/0022-3727/31/6/022

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…The drift velocity is increasing as the reduced electrical field increases. The calculated results are compatible with the measured [30] and Monte Carlo results [10,31]. The reduced effective ionization coefficient in pure nitrogen is shown in Fig.…”

Section: Resultssupporting

confidence: 85%

Electron Swarm Parameters in Methane-Nitrogen Mixtures

et al. 2019

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In this paper, binary methane-nitrogen gas mixtures are recommended in order to reduce the industrial use of methane, which stands out among the greenhouse gases. The electron mean energy, drift velocity, ionization and effective ionization coefficients are presented for the binary mixtures with the CH4 content, varying from 20% to 80% in the mixtures. The relevant parameters of pure methane and nitrogen are evaluated for comparison with the data available in literature in order to verify the validity of the computational methodology which is based on solution of the Boltzmann equation. The swarm parameters in the methane-nitrogen mixtures have been evaluated for E/N from 80 Td to 400 Td (1 Td = 1 × 10 −17 V cm 2). The presented data and the results have the potential to be widely used in plasma physics, electrical insulation systems, and space studies.

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Section: Resultssupporting

confidence: 85%

Electron Swarm Parameters in Methane-Nitrogen Mixtures

et al. 2019

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“…For example, the carbon dioxide molecule has large vibrational excitation cross sections in energy from 0.1 to 40 eV (e.g. Hasegawa et al (1998)). For the discrepancy in the high E/N region above 800 Td, we may not rule out the possibility that the electron swarm is not in the hydrodynamic condition under such a high E/N.…”

Section: Resultsmentioning

confidence: 99%

Electron swarm parameters in water vapour

Hasegawa¹,

Date²,

Shimozuma³

2007

J. Phys. D: Appl. Phys.

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Electron swarm parameters, such as the drift velocity and the ionization coefficient, in water vapor have been measured for relatively wide ranges in reduced electric fields (E/N) at room temperature. The drift velocity (W m ) was obtained based upon the arrival-time spectra of electrons by using a double-shutter drift tube for the E/N from 60 to 1000 Td, while the first and second ionization coefficients (α and γ) were determined by the steady-state Townsend (SST) method from 50 to 3000 Td. The comparison between the results and other data in the literature shows that our results for both the drift velocity and the effective ionization coefficient are lower than those of the other data in the above ranges.

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“…Diurnal variations are substantial, and photoelectrons almost certainly dominate the Martian daytime atmospheric conductivity (Equation (2)) because of their high number concentration and electrical mobility, given as 200 m 2 V )1 s )1 in CO 2 at 1.33 hPa (Hasegawa et al, 1998). Martian atmospheric CO À 2 ions are orders of magnitude less mobile than the electron.…”

Section: Variability In Martian Atmospheric Electricitymentioning

confidence: 99%

“…Martian fair weather atmospheric electricity is likely to be much more variable than on Earth, for reasons first summarized by Fillingim (1998). Diurnal variations are substantial, and photoelectrons almost certainly dominate the Martian daytime atmospheric conductivity (Equation ( 2)) because of their high number concentration and electrical mobility, given as 200 m 2 V -1 s -1 in CO 2 at 1.33hPa (Hasegawa et al, 1998).…”

Section: Variability In Martian Atmospheric Electricitymentioning

confidence: 99%

Atmospheric Electrification in the Solar System

Aplin

2006

Surv Geophys

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Atmospheric electrification is not a purely terrestrial phenomenon: all Solar System planetary atmospheres become slightly electrified by cosmic ray ionisation. There is evidence for lightning on Jupiter, Saturn, Uranus and Neptune, and it is possible on Mars, Venus and Titan. Controversy surrounds the role of atmospheric electricity in physical climate processes on Earth; here, a comparative approach is employed to review the role of electrification in the atmospheres of other planets and their moons. This paper reviews the theory, and, where available, measurements, of planetary atmospheric electricity which is taken to include ion production and ion-aerosol interactions. The conditions necessary for a planetary atmospheric electric circuit similar to Earth's, and the likelihood of meeting these conditions in other planetary atmospheres, are briefly discussed. Atmospheric electrification could be important throughout the solar system, particularly at the outer planets which receive little solar radiation, increasing the relative significance of electrical forces. Nucleation onto atmospheric ions has been predicted to affect the evolution and lifetime of haze layers on Titan, Neptune and Triton. Atmospheric electrical processes on Titan, before the arrival of the Huygens probe, are summarised. For planets closer to Earth, heating from solar radiation dominates atmospheric circulations. However, Mars may have a global circuit analogous to the terrestrial model, but based on electrical discharges from dust storms. There is an increasing need for direct measurements of planetary atmospheric electrification, in particular on Mars, to assess the risk for future unmanned and manned missions. Theoretical understanding could be increased by cross-disciplinary work to modify and update models and parameterisations initially developed for a specific atmosphere, to make them more broadly applicable to other planetary atmospheres.

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Measurements of the drift velocity of electrons in mixtures of nitrogen and carbon dioxide from 100 to 1000 Td

Cited by 11 publications

References 19 publications

Electron Swarm Parameters in Methane-Nitrogen Mixtures

Electron Swarm Parameters in Methane-Nitrogen Mixtures

Electron swarm parameters in water vapour

Atmospheric Electrification in the Solar System

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