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Summary: Measurement and prediction of the speed-dependent throughput of a magnetic octupole velocity
filter including nonadiabatic effects
Evgueni Nikitin and Elena Dashevskaya
Department of Chemistry, Technion--Israel Institute of Technology, Haifa 32000, Israel
Janis Alnis and Marcis Auzinsh
Department of Physics, University of Latvia, 19 Rainis Boulevard, Riga, LV 1586, Latvia
E. R. I. Abraham, Brendan R. Furneaux, Mark Keil,* Chris McRaven, Neil Shafer-Ray, and Richard Waskowsky
Department of Physics and Astronomy, The University of Oklahoma, Norman, Oklahoma 73019, USA
Received 23 August 2002; published 13 August 2003
A magnetic octupole filter set in a 90° curve produces 108
cold Rb atoms/s by filtering low-velocity
particles from a thermal source. We measure the speed distribution of Rb exiting the filter to be 3.5 K using a
Rydberg-atom time-of-flight scheme in which Rb is excited via the process 5s 2
S1/25p 2
P3/2
o
32d 2
D. We
develop a general theory of the transmission and speed distribution of particles emitted from such a source
including nonadiabatic effects. A detailed Monte Carlo simulation using the theory accurately reproduces the
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