The drift velocity and longitudinal diffusion coefficient of electrons in nitrogen and carbon dioxide from 20 to 1000 Td

Hasegawa, H.; Date, Hiroyuki; Shimozuma, M.; Yoshida, Kenichi; Tagashira, Hiroaki

doi:10.1088/0022-3727/29/10/018

Cited by 40 publications

(53 citation statements)

References 15 publications

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“…4 The drift velocity, W m , is deduced by dividing the mean time of arrival of electrons by the distance between the electrodes. The experimental apparatus and procedure for the ATS method were the same as those described by Hasegawa et al 5 In the present study, the position of the collector plate was set at four locations, and the final value of drift velocity was determined by averaging the values determined at the four cases for each value of E/N.…”

Section: Experimental Methods a Arrival-time Spectra Methodsmentioning

confidence: 99%

Study of electron transport in hydrocarbon gases

Hasegawa

Date

2015

Journal of Applied Physics

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The drift velocity and the effective ionization coefficient of electrons in the organic gases, C2H2, C2H4, C2H6, CH3OH, C2H5OH, C6H6, and C6H5CH3, have been measured over relatively wide ranges of density-reduced electric fields (E/N) at room temperature (around 300 K). The drift velocity was measured, based on the arrival-time spectra of electrons by using a double-shutter drift tube over the E/N range from 300 to 2800 Td, and the effective ionization coefficient (α − η) was determined by the steady-state Townsend method from 150 to 3000 Td. Whenever possible, these parameters were compared with those available in the literature. It has been shown that the swarm parameters for these gases have specific tendencies, depending on their molecular configurations.

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Section: Experimental Methods a Arrival-time Spectra Methodsmentioning

confidence: 99%

Study of electron transport in hydrocarbon gases

Hasegawa

Date

2015

Journal of Applied Physics

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“…The experiment is conducted using a double-shutter drift tube, where arriving electrons are collected by the electrode with shutter 2 at a certain distance from the cathode ͑with shutter 1 releasing initial electrons͒. The experimental apparatus and procedure for this method are the same as those described by Hasegawa et al 11 The value W m is determined by the derivative of the mean arrival-time ͗t͘ with respect to the drift distance as in Eq. ͑3͒.…”

mentioning

confidence: 99%

Properties of electron swarms in CF3I

Hasegawa

Date

Shimozuma

2009

Applied Physics Letters

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We report the electron swarm parameters, the drift velocity, and the ionization coefficients in CF 3 I gas for relatively wide ranges of reduced electric fields ͑E / N͒. The drift velocity is measured based on the arrival-time spectra of electrons for E / N = 200-3000 Td, and the first and second ionization coefficients are determined by the steady-state Townsend method for E / N = 400-5000 Td. The results are compared with those of CF 4 to show that CF 3 I has a high reactivity for electron attachment in a low E / N region resulting in a much higher limiting E / N value ͑440 Td͒ than that of CF 4 .

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“…The experimental apparatus used in the present experiment is the same as that for the ATS method described by Hasegawa et al, 8 but is utilized differently, where the double-shutter is moved little by little along the field direction in the drift chamber for capturing the spatial distribution of electron swarms. Figure 1 shows a schematic diagram of the chamber and its internal configurations.…”

Section: A Double-shutter Electrode In Drift Tubementioning

confidence: 99%

“…The authors have measured the arrival-time distribution of electrons by a double-shutter electrode technique based on the ATS method, 8,9 demonstrating the ATS method experimentally in order to achieve a direct comparison of the parameters between the theoretical and experimental. In the course of the ATS measurement, we found that our apparatus enables us to measure also the spatial distribution of an isolated swarm under moderate field conditions ͑see next section͒ by moving the double-shutter electrode to collect incoming electrons along the drift direction ͑electric field direction͒ and to deduce directly a typical parameter, the drift velocity.…”

Section: Introductionmentioning

confidence: 99%

Time-of-flight observation of electron swarm in methane

Hasegawa¹,

Date²,

Yoshida³

et al. 2009

Journal of Applied Physics

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This paper reports on the evolution of an isolated electron swarm, which is experimentally observed as spatial distributions at every moment. This observation is assumed to directly correspond to the conventional time-of-flight theory. We have measured the spatial distribution of electrons using a double-shutter technique in the drift tube, where a shutter electrode to collect electrons can be slid along the field ͑E / N͒ direction in order to capture a relative electron number at a certain range of location. As a typical parameter defined by this spatial distribution, the center-of-mass drift velocity ͑W r ͒ is determined for methane gas. The result is compared with the mean-arrival-time drift velocity ͑W m ͒ defined from the arriving electron number at fixed positions. We have also performed a theoretical analysis in which a Fourier transformed Boltzmann equation is solved to deduce both of the drift velocities from a dispersion relationship. The difference between W r and W m at high E / Ns ͑above 200 Td͒ is clearly ascertained in the experimental and theoretical investigations, which is attributable to the occurrence of ionization events.

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The drift velocity and longitudinal diffusion coefficient of electrons in nitrogen and carbon dioxide from 20 to 1000 Td

Cited by 40 publications

References 15 publications

Study of electron transport in hydrocarbon gases

Study of electron transport in hydrocarbon gases

Properties of electron swarms in CF3I

Time-of-flight observation of electron swarm in methane

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