Slow molecules are efficiently extracted from a thermal reservoir by exploiting the interaction between polar molecules and the field provided by an electrostatic quadrupole guide. Electrostatic velocity filtering is widely applicable, which is demonstrated by producing guided beams of ammonia ND3, formaldehyde H2CO, and the water isotopologs H2O, D2O, and HDO. Ultraviolet depletion spectroscopy in a cold guided beam of formaldehyde makes the population in individual rotational states visible and testifies their key role in velocity filtering. Enhanced Rayleigh scattering into an optical cavity is investigated as an alternative non-destructive detection method for cold molecules. For various room-temperature gases, the observed enhancement is well described by interference of electromagnetic fields scattered into the resonator by a classical driven dipole oscillator.Slow molecules are efficiently extracted from a thermal reservoir by exploiting the interaction between polar molecules and the field provided by an electrostatic quadrupole guide. Electrostatic velocity filtering is widely applicable, which is demonstrated by producing guided beams of ammonia ND3, formaldehyde H2CO, and the water isotopologs H2O, D2O, and HDO. Ultraviolet depletion spectroscopy in a cold guided beam of formaldehyde makes the population in individual rotational states visible and testifies their key role in velocity filtering. Enhanced Rayleigh scattering into an optical cavity is investigated as an alternative non-destructive detection method for cold molecules. For various room-temperature gases, the observed enhancement is well described by interference of electromagnetic fields scattered into the resonator by a classical driven dipole oscillator.

Jan 1, 20101 citation

Velocity-selected molecular pulses produced by an electric guide

Christian Sommer, M. Motsch, Sotir Chervenkov +4 more

Electrostatic velocity filtering is a technique for the production of continuous guided beams of slow polar molecules from a thermal gas. We extended this technique to produce pulses of slow molecules with a narrow velocity distribution around a tunable velocity. The pulses are generated by sequentially switching the voltages on adjacent segments of an electric quadrupole guide synchronously with the molecules propagating at the desired velocity. This technique is demonstrated for deuterated ammonia (ND ${}_{3}$ ), delivering pulses with a velocity in the range of $20\ensuremath{-}100$ m/s and a relative velocity spread of $(16\ifmmode\pm\else\textpm\fi{}2)%$ at full width at half maximum. At velocities around $60$ m/s, the pulses contain up to ${10}^{6}$ molecules each. The data are well reproduced by Monte Carlo simulations, which provide useful insight into the mechanisms of velocity selection.Electrostatic velocity filtering is a technique for the production of continuous guided beams of slow polar molecules from a thermal gas. We extended this technique to produce pulses of slow molecules with a narrow velocity distribution around a tunable velocity. The pulses are generated by sequentially switching the voltages on adjacent segments of an electric quadrupole guide synchronously with the molecules propagating at the desired velocity. This technique is demonstrated for deuterated ammonia (ND${}_{3}$), delivering pulses with a velocity in the range of $20\ensuremath{-}100$ m/s and a relative velocity spread of $(16\ifmmode\pm\else\textpm\fi{}2)%$ at full width at half maximum. At velocities around $60$ m/s, the pulses contain up to ${10}^{6}$ molecules each. The data are well reproduced by Monte Carlo simulations, which provide useful insight into the mechanisms of velocity selection.

arXiv:1004.0968Physical Review AJul 16, 201027 citations

Continuous source of translationally cold dipolar molecules

S. A. Rangwala, T. Junglen, T. Rieger +2 more

The Stark interaction of polar molecules with an inhomogeneous electric field is exploited to select slow molecules from a room-temperature reservoir and guide them into an ultrahigh vacuum chamber. A linear electrostatic quadrupole with a curved section selects molecules with small transverse and longitudinal velocities. The source is tested with formaldehyde $({\mathrm{H}}_{2}\mathrm{CO})$ and deuterated ammonia $({\mathrm{ND}}_{3}).$ With ${\mathrm{H}}_{2}\mathrm{CO}$ a continuous flux is measured of $\ensuremath{\approx}{10}^{9}/\mathrm{s}$ and a longitudinal temperature of a few kelvin. The data are compared with the result of a Monte Carlo simulation.The Stark interaction of polar molecules with an inhomogeneous electric field is exploited to select slow molecules from a room-temperature reservoir and guide them into an ultrahigh vacuum chamber. A linear electrostatic quadrupole with a curved section selects molecules with small transverse and longitudinal velocities. The source is tested with formaldehyde $({\mathrm{H}}_{2}\mathrm{CO})$ and deuterated ammonia $({\mathrm{ND}}_{3}).$ With ${\mathrm{H}}_{2}\mathrm{CO}$ a continuous flux is measured of $\ensuremath{\approx}{10}^{9}/\mathrm{s}$ and a longitudinal temperature of a few kelvin. The data are compared with the result of a Monte Carlo simulation.

arXiv:physics/0209041Physical Review AApr 17, 2003210 citations

{}_{3}

), delivering pulses with a velocity in the range of $20\ensuremath{-}100$ m/s and a relative velocity spread of $(16\ifmmode\pm\else\textpm\fi{}2)%$ at full width at half maximum. At velocities around

60

m/s, the pulses contain up to

{10}^{6}

molecules each. The data are well reproduced by Monte Carlo simulations, which provide useful insight into the mechanisms of velocity selection.

({\mathrm{H}}_{2}\mathrm{CO})

and deuterated ammonia

({\mathrm{ND}}_{3}).

With

{\mathrm{H}}_{2}\mathrm{CO}

a continuous flux is measured of $\ensuremath{\approx}{10}^{9}/\mathrm{s}$ and a longitudinal temperature of a few kelvin. The data are compared with the result of a Monte Carlo simulation.