Cryogenic microjet source for orthotropic beams of ultralarge superfluid helium droplets |
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Authors: | Grisenti Robert E Toennies J Peter |
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Institution: | Max-Planck-Institut für Str?mungsforschung, Bunsenstrasse 10, 37073 G?ttingen, Germany. |
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Abstract: | Liquid 4He at pressures P(0)=0.5-30 bars and temperatures T(0)=1.5-4.2 K is discharged into vacuum through two different 2 microm nozzles. The velocities of the beam of particles obey the Bernoulli equation down to 15 m/sec. With decreasing T0 and increasing P0 the velocity and angular distributions become exceedingly narrow with Deltav/v less or similar 1% and Deltatheta less or similar 1 mrad. Optical observations indicate that the beam consists of micron-sized droplets (N greater or similar 10(9) atoms). This new droplet source provides opportunities for novel experimental studies of superfluid behavior. |
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