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Time-of-flight observation of electron swarm in methane

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Title: Time-of-flight observation of electron swarm in methane
Authors: Hasegawa, H. Browse this author
Date, H. Browse this author →KAKEN DB
Yoshida, K. Browse this author
Shimozuma, M. Browse this author
Issue Date: Jun-2009
Publisher: American Institute of Physics
Journal Title: Journal of Applied Physics
Volume: 105
Issue: 11
Start Page: 113308
Publisher DOI: 10.1063/1.3142322
Abstract: 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/N) 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 (Wr) is determined for methane gas. The result is compared with the mean-arrival-time drift velocity (Wm) 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 Wr and Wm at high E/Ns (above 200 Td) is clearly ascertained in the experimental and theoretical investigations, which is attributable to the occurrence of ionization events.
Rights: Copyright 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Type: article
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊達 広行

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