Electrostatic extraction of cold molecules from a cryogenic reservoir.
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)%.
van Buuren
L D
LD
Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
Sommer
C
C
Motsch
M
M
Pohle
S
S
Schenk
M
M
Bayerl
J
J
Pinkse
P W H
PW
Rempe
G
G