A Velocity Filter for Electrons and Ions
- Creators
- Smythe, William R.
Abstract
If a charged particle, moving along the x-axis with a velocity v, encounters successively two identical alternating electric fields of frequency ν, which are everywhere perpendicular to the x-axis, it will emerge from the last field undisplaced and traveling in the original direction under the following conditions: (1) Each field has two similar halves whose distance between centers is a; (2) The distance between the fields, center to center, is D=sa/n, where s and n are odd integers; (3) The velocity of the particle is v_0=2aν/n. The distribution about the velocity v_0 is computed when particles enter and leave the system through slits of width y_0 on the x-axis. The results show that the emergent beam can be confined to a very narrow velocity range.
Additional Information
© 1926 The American Physical Society. Received 16 July 1926; published in the issue dated December 1926. The author wishes to thank Dr. Bowen for valuable suggestions and Professor Epstein for checking some of the equations.Attached Files
Published - SMYpr26.pdf
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Additional details
- Eprint ID
- 43249
- Resolver ID
- CaltechAUTHORS:20140107-134454414
- Created
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2014-01-07Created from EPrint's datestamp field
- Updated
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2023-01-18Created from EPrint's last_modified field