NDLI: Velocity spectrometer for a neutral atomic beam

Content Provider	Springer Nature Link
Author	Yasutake, K. Ohmi, H. Shimizu, M. Takeuchi, A. Kakiuchi, H. Yoshii, K. Mori, Y.
Copyright Year	2000
Abstract	A velocity spectrometer for a neutral atomic beam has been developed to prepare a monovelocity atomic beam. In order to disperse a relatively fast atomic beam according to its longitudinal velocity, a magnetic quadrupole lens with a large magnetic gradient has been used. The device was made using NdFeB permanent magnets. The magnetic gradient in the quadrupole was measured to be sufficiently large (1 T/cm) and uniform along the radial direction. The resonance fluorescence spectra of the Li atomic beam after passing through the magnetic quadrupole lens have been measured by using a single-mode tunable laser. From the peak shift of the fluorescence spectrum, the exerted force on Li atoms by the magnetic lens was 8160 times as large as the acceleration of gravity. Using the present spectrometer, we have measured the longitudinal velocity distribution of the thermal Li beam at 800 °C, which was in good agreement with the result from the fluorescence spectra. It is expected that a monovelocity Li atomic beam of 1000 m/s with a velocity spread narrower than 1% can be easily formed with a compact experimental arrangement using the developed velocity spectrometer. In this case, the available flux given as a fraction of the incident Li flux is estimated to be about 1%. A high-velocity resolution of 0.03% is expected at the available fractional flux of about 0.01%.
Starting Page	787
Ending Page	793
Page Count	7
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	71
Issue Number	6
e-ISSN	14320649
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-12-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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