Slow ammonia molecules in an electrostatic quadrupole guide

Junglen, T. ; Rieger, T. ; Rangwala, S. A. ; Pinkse, P. W. H. ; Rempe, G. (2004) Slow ammonia molecules in an electrostatic quadrupole guide The European Physical Journal D, 31 (2). pp. 365-373. ISSN 1434-6060

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An electrostatic quadrupole is used to filter slow dipolar ND3 molecules from an effusive source and to guide them into ultrahigh vacuum. The molecules in the electrostatic quadrupole experience a Stark interaction which allows filtering of small velocities in the linear and bent sections of the quadrupole. With this technique we demonstrate a flux of ≈1010/s with a longitudinal temperature of a few K. The technique and the set-up are discussed in detail, and the guided gas as well as the output beam are characterized. Improvements in the set-up are highlighted, as for instance cooling of the effusive source to below 150 K.

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