Time-of-flight measurement of electron drift velocity and longitudinal diffusion coefficient in nitrogen, carbon monoxide, carbon dioxide and hydrogen

Saelee, H T; Lucas, J.; Limbeek, J.W.

doi:10.1049/ij-ssed.1977.0014

Cited by 28 publications

(22 citation statements)

References 8 publications

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“…In figure 4, the velocity W p calculated from the ratio of the flight distance to the corresponding peak-to-peak flight time, which is usually adopted in the conventional TOF analysis (Wagner et al 1967, Saelee et al 1977 is also shown. It is confirmed that W p agrees well with W m , especially in the low-E/N range, as seen in the previous work with tetraethoxysilane (Yoshida et al 1996b).…”

Section: The Mean-arrival-time Drift Velocity W M (The Inverse Of The...mentioning

confidence: 99%

“…Arrival-time spectra of electrons obtained in an isolated electron swarm at positions in the drift space are analysed by an arrival-time spectra (ATS) method (Tagashira 1985, Kondo andTagashira 1990). Note that the ATS method is more appropriate than the conventional timeof-flight (TOF) method (Wagner et al 1967, Saelee et al 1977 since the ATS theory was developed essentially to describe the arrival-time spectra of electrons measured in a drift tube. It should be also pointed out that the ATS method makes simultaneous measurement of the above three transport coefficients over a wide E/N range possible, as demonstrated in the previous works (Yoshida et al 1996a, b).…”

Section: Introductionmentioning

confidence: 99%

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Measurement of electron-transport coefficients in O by a double-shutter drift-tube method

Yoshida¹,

Sasaki²,

Ohuchi³

et al. 1999

J. Phys. D: Appl. Phys.

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A double-shutter drift-tube technique based on an analysis of arrival-time spectra has been applied to experimentally determine three electron-transport coefficients in N 2 O, namely the ratio of the effective ionization coefficient to the gas density α eff /N, the mean-arrival-time drift velocity W m and the product of the longitudinal electron-diffusion coefficient and the gas density ND L over a wide E/N range of 7-5000 Td (1 Td = 10 −21 V m 2 ). The result shows that the obtained α eff /N is in excellent agreement with that of the steady-state Townsend experiment at E/N of 500-5000 Td. In a lower E/N range, however, some difference is observed. As a result of examination, it is revealed that the difference approximately gives the true attachment coefficient η/N under the present experimental conditions. The W m determined takes an almost constant value at 15 Td < E/N < 40 Td and, in the other E/N ranges, monotonically increases with E/N. Its profile differs from available experimental data at E/N > 10 Td but is rather close to theoretically derived data. The ratio of the longitudinal diffusion coefficient to the electron mobility D L /µ is also deduced. Furthermore, the result analysed by the conventional time-of-flight method is presented for comparison.

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Section: The Mean-arrival-time Drift Velocity W M (The Inverse Of The...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of electron-transport coefficients in O by a double-shutter drift-tube method

Yoshida¹,

Sasaki²,

Ohuchi³

et al. 1999

J. Phys. D: Appl. Phys.

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“…Some investigators have measured the parameters for the individual gases (e.g. Saelee et al 1977) at E/N ≤ 700 Td, where E is the electric field and N is the gas number density. Our previous work (Hasegawa et al 1996) was an extension of the work of Saelee et al with the values of W m and D L /µ (µ is the electron mobility) in pure N 2 and CO 2 covering a wider range of E/N, up to 1000 Td.…”

Section: Introductionmentioning

confidence: 99%

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

Hasegawa¹,

Date²,

Ohmori³

et al. 1998

J. Phys. D: Appl. Phys.

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The arrival-time spectra (ATS) of electrons in mixtures of nitrogen and carbon dioxide have been measured for reduced electric fields from 100 to 1000 Td at room temperature by using a double-shutter drift tube. The drift velocity of the electrons in and mixtures was evaluated from a previously reported ATS method. In mixtures of and , we found that is larger than the value predicted by a linear combination of the drift velocities of the pure gases based on the mole fraction (partial pressure) of in the mixture, k, in the range of low . We refer to this as the `mixing effect'. In contrast, a linear combination of the drift velocities of the pure gases based on k was found to accurately predict the drift velocities in mixtures in the higher region . In addition to the experimental evaluation, calculations of in these gas mixtures were carried out by a Boltzmann equation analysis, and the results were compared with those from the ATS measurements. The ratio of the longitudinal diffusion coefficient to the electron mobility was also estimated. The value of , called the characteristic energy, also shows a small mixing effect with increasing k in the range of low and increases monotonically in the range of , while the value decreases linearly as k increases in the higher range.

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“…The electron swarm parameters of CO 2 for low E/N≤30 Td were measured by (Elford, 1966;Pack, Voshall, & Phelps, 1962). Moreover, the electron drift velocity and characteristic energy for pure N 2 and CO 2 over the range 10≤E/N≤700 Td have been studied by (Roznerski & Leja, 1984;Saelee, Lucas, & Limbeek, 1977). The electron drift velocity and longitudinal diffusion coefficient of both pure N 2 and CO 2 at room temperature have been measured experimentally in the range 20≤E/N≤ 1000 Td using double-shutter drift tube technique by (Hasegawa, Date, Shimozuma, Yoshida, & Tagashira, 1996), ionization and attachment coefficient in CO 2 obtained for 60≤E/N≤152 Td by (Alger & Rees, 1976).…”

Section: Introductionmentioning

confidence: 99%

Transport Parameters and Dielectric Strength of Electrical Discharges in an Arc Discharges in Carbon Dioxide Gas

2020

ZJPAS

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The two-term approximation solution of Boltzmann equation analysis has been used to calculate the electron energy distribution function (EEDF), dielectric strength and the electron swarm parameters in carbon dioxide. The electron swarm parameters have been calculated over the wide range of reduced density electric field strength E/N varying from 0.1 to 1000 Td ( 1Td= 10 -17 V.cm 2 ). These parameters, namely electron drift velocity, mean electron energy, electron temperature, characteristic energy, transverse diffusion coefficient, electron mobility, reduced ionization and attachment Townsend coefficients have been compared with the available previous theoretical and experimental results. The values of the critical reduced electric field strength (E/N) cr from the curves of reduced effective ionization coefficient (α-η)/N are calculated. In addition, excitation rate and fractional power transfer to elastic and inelastic collisions are explained.

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Time-of-flight measurement of electron drift velocity and longitudinal diffusion coefficient in nitrogen, carbon monoxide, carbon dioxide and hydrogen

Cited by 28 publications

References 8 publications

Measurement of electron-transport coefficients in O by a double-shutter drift-tube method

Measurement of electron-transport coefficients in O by a double-shutter drift-tube method

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

Transport Parameters and Dielectric Strength of Electrical Discharges in an Arc Discharges in Carbon Dioxide Gas

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