By Topic

Measurements of the longitudinal diffusion coefficient and the drift velocity for electron swarms in hydrogen and nitrogen using a time-of-flight technique

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $33
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
R. A. Snelson ; University of Liverpool, Department of Electrical Engineering & Electronics, Liverpool, UK

A time-of-flight technique has been developed to measure accurately the longitudinal diffusion coefficient (DL) and the drift velocity (v) for electron swarms drifting and diffusing through uniform electric fields at high E/N.A pulse of electrons is released at the cathode, and a `box-car¿ detector system is used to record the anode current distribution. The drift velocity is obtained from the mean delay time, and the longitudinal-diffusion coefficient is obtained from the standard deviation of the distribution. Results have been given for both hydrogen and nitrogen gas for the range 3 ¿ E/N ¿ 43 Td (1 Td = 10¿21 Vm2). The values for the drift velocity are in good agreement with theory, whereas the values for DL have revealed inadequacies in the present theoretical values for nitrogen.

Published in:

Electrical Engineers, Proceedings of the Institution of  (Volume:122 ,  Issue: 3 )