Velocity distributions from the Fourier transforms of Ramsey line shapes
- 13 January 2003
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 162-167
- https://doi.org/10.1109/freq.1989.68859
Abstract
A computerized method for finding velocity distributions from the Fourier transforms of Ramsey line shapes has been developed. Ramsey lineshape data taken at different excitation powers is used; a weighted average of data from three powers gives satisfactory results. The excitation amplitude parameter b is found by minimizing a quality-of-fit criterion. The method is limited to long standards by the assumption that the excitation length l is much less than the drift region length L. However, the addition of first order l/L corrections to the theory make the method usable for shorter standards. The method has been successfully tested with lineshapes theoretically generated from known velocity distributions.Keywords
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