Sotir Chervenkov

Continuous Centrifuge Decelerator for Polar Molecules

Producing large samples of slow molecules from thermal-velocity ensembles is a formidable challenge. Here we employ a centrifugal force to produce a continuous molecular beam with a high flux at near-zero velocities. We demonstrate deceleration of three electrically guided molecular species, CH3F, CF3H, and CF3CCH, with input velocities of up to 200  m s(-1) to obtain beams with velocities below 15  m s(-1) and intensities of several 10(9)  mm(-2) s(-1). The centrifuge decelerator is easy to operate and can, in principle, slow down any guidable particle. It has the potential to become a standard technique for continuous deceleration of molecules.

Generation of lattice structures of optical vortices

We demonstrate experimentally the generation of square and hexagonal lattices of optical vortices and reveal their propagation in a saturable nonlinear medium. If the topological charges of the vortices have identical signs, the lattice exhibits rotation, whereas if their signs alternate between being the same and being opposite to each other, we observe stable propagation of the structures. In the nonlinear medium the lattices induce periodic modulation of the refractive index. Diffraction of a probe beam by this nonlinearity-induced periodic structure is observed.

Velocity-selected molecular pulses produced by an electric guide

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

A cryofuge for cold-collision experiments with slow polar molecules

{}_{3}

Thermometry of Guided Molecular Beams from a Cryogenic Buffer-Gas Cell

), delivering pulses with a velocity in the range of

An experimental toolbox for the generation of cold and ultracold polar molecules

20\ensuremath{-}100

A high density source of cold, slow and rotationally pure polar molecules

m/s and a relative velocity spread of

Back Cover: Thermometry of Guided Molecular Beams from a Cryogenic Buffer-Gas Cell (ChemPhysChem 22/2016)

(16\ifmmode\pm\else\textpm\fi{}2)%

Stopping intense beams of internally cold molecules via centrifugal forces

at full width at half maximum. At velocities around

Internal-state thermometry of cold polyatomic molecules

60