title: Electrostatic extraction of cold molecules from a cryogenic reservoir.
abstract: We present a method which delivers a continuous, high-density beam of slow and internally cold polar molecules. In our source, warm molecules are first cooled by collisions with a cryogenic helium buffer gas. Cold molecules are then extracted by means of an electrostatic quadrupole guide. For ND3 the source produces fluxes up to (7+/- 4(7)) x 10(10) molecules/s with peak densities up to (1.0+/- 0.6(1.0)) x 10(9) molecules/cm3. For H2CO the population of rovibrational states is monitored by depletion spectroscopy, resulting in single-state populations up to (82+/-10)%.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: L D
authors.initials: LD
authors.lastname: van Buuren
authors.forename: C
authors.initials: C
authors.lastname: Sommer
authors.forename: M
authors.initials: M
authors.lastname: Motsch
authors.forename: S
authors.initials: S
authors.lastname: Pohle
authors.forename: M
authors.initials: M
authors.lastname: Schenk
authors.forename: J
authors.initials: J
authors.lastname: Bayerl
authors.forename: P W H
authors.initials: PW
authors.lastname: Pinkse
authors.forename: G
authors.initials: G
authors.lastname: Rempe