Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

A “Wonderstone” microwave cavity for electron spin resonance spectrometers

A “Wonderstone” microwave cavity for electron spin resonance spectrometers Appl. sci. Res. Section B, Vol. 9 LETTER TO THE EDITOR A "Wonderstone" microwave cavity for electron spin resonance spectrometers In our laboratory we use a 3-cm esr spectrometer with phase-sensitive detection (modulation frequency 1000 Hz). This spectrometer has been described in detail elsewhere 1). When using a brass TE0n cavity we noticed that, even in the absence of electron spin resonance, the detected signal practically always differs from zero. This signal is caused by the interaction between the static magnetic field and the Foucault-currents induced in the walls of the cavity by the alternating magnetic field. This interaction causes a slight vibration of the cavity in a 1000 Hz-rythm so that the resonance frequency changes in the same rythm and the detected signal may contain a 1000 Hz component. This component is liable to fluctuate as a result of variations in temperature, klystron frequency and mechanical influences. These fluctuations manifest themselves as apparent noise, especially in measurements taking a long time as a result of broad resonance lines and application of long RC-times. To suppress this troublesome phenomenon, it is necessary to minimize the generation of the Foucault-currents, by making the conducting walls of the cavity as thin http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Scientific Research, Section B Springer Journals

A “Wonderstone” microwave cavity for electron spin resonance spectrometers

Download PDF
2 pages

Loading next page...
 
/lp/springer-journals/a-wonderstone-microwave-cavity-for-electron-spin-resonance-90EN6pFUqJ

References (3)

Publisher
Springer Journals
Copyright
Copyright © Martinus Nijhoff 1961
ISSN
0365-7140
DOI
10.1007/bf02922223
Publisher site
See Article on Publisher Site

Abstract

Appl. sci. Res. Section B, Vol. 9 LETTER TO THE EDITOR A "Wonderstone" microwave cavity for electron spin resonance spectrometers In our laboratory we use a 3-cm esr spectrometer with phase-sensitive detection (modulation frequency 1000 Hz). This spectrometer has been described in detail elsewhere 1). When using a brass TE0n cavity we noticed that, even in the absence of electron spin resonance, the detected signal practically always differs from zero. This signal is caused by the interaction between the static magnetic field and the Foucault-currents induced in the walls of the cavity by the alternating magnetic field. This interaction causes a slight vibration of the cavity in a 1000 Hz-rythm so that the resonance frequency changes in the same rythm and the detected signal may contain a 1000 Hz component. This component is liable to fluctuate as a result of variations in temperature, klystron frequency and mechanical influences. These fluctuations manifest themselves as apparent noise, especially in measurements taking a long time as a result of broad resonance lines and application of long RC-times. To suppress this troublesome phenomenon, it is necessary to minimize the generation of the Foucault-currents, by making the conducting walls of the cavity as thin

Journal

Applied Scientific Research, Section B – Springer Journals

Published: Jun 1, 1961

Keywords: Electron Spin Resonance; Electron Spin Resonance Spectrometer; Microwave Cavity; Silver Layer; Cylindrical Casing

There are no references for this article.