Zoek in de site...

Seminar by Prof. Vitaly Kresin, Dept. of Physics and Astronomy, University of Southern California (Lecture)

Tuesday 12 December 2017Add to my calendar
from 09:30
Prof. Vitaly Kresin, Dept. of Physics and Astronomy, University of Southern California (USA)
“Cranking and pushing cold dipoles: Polar molecules in superfluid nanodroplets“

Vitaly Kresin dec2017The use of external fields to orient, deflect, and trap individual polar molecules has retained attention all the way from the early years of quantum mechanics through today’s pursuit of novel quantum matter, quantum reactions, and quantum computers based on cold polar molecules.  However, ultracold trapping has been achieved only for a small number of diatomic molecules, while supersonic expansions typically produce molecules with energies above several Kelvins. On the other hand, by embedding polar molecules in a beam of superfluid helium nanodroplets one can reduce their temperatures to 400 mK, and application of an external static electric field transforms their rotations into pendular motion, achieving nearly full orientation of the dipoles. I will describe how this extremely high degree of orientation can be exploited in beam deflection experiments.  This technique is applicable to a wide variety of molecules and offers a means of determining, in a direct manner, the dipole moments of molecules that are difficult to obtain by other methods, as well as a means to size-select the fragile neutral nanodroplets.  The measurements also provide evidence for the formation of highly polar systems by dipoles assembling into aligned structures within the droplets.

Andrei Kirilyuk & Joost Bakker