My watch list
my.chemeurope.com  
Login  

Nanodroplets rotate faster than expected

Scientists observe quantum vortices in cold helium droplets

25-Aug-2014

SLAC National Accelerator Laboratory

Artist's concept of the array of quantum vortices in a superfluid droplet.

An international research team including DESY scientists has observed tiny quantum vortices in cold droplets of liquid helium. The team reports in the journal Science that the exotic vortices arrange themselves as densely packed lattices inside the nanodroplets. It is the first time that the quantum vortices, which have already been observed in larger samples of what is known as superfluid helium, have been detected in nanodroplets. “The experiment has exceeded our best expectations,”says Andrey Vilesov of the University of Southern California, one of the experiment’s three leads.

The noble gas helium becomes liquid at minus 269 degrees Celsius. Below minus 271 degrees a quantum effect occurs, through which the liquid helium loses all internal friction and becomes superfluid. In this exotic state it can even crawl up walls. To explore the dynamics of superfluid helium, the scientists X-rayed tiny helium nanodroplets with what is currently the world’s strongest X-ray laser, the Linac Coherent Light Source LCLS at the SLAC National Accelerator Laboratory in California.

The production of the cold droplets with an average of only 0.2 to 2 thousandths of a millimetre was no easy task. The scientists sprayed the liquid helium through a fine nozzle into a vacuum chamber. A portion of the helium evaporated on the way, and the remaining portion of the drop continued cooling due to evaporative cooling. “After a distance of few millimeters, the drops reached the superfluid state and were struck by the intense X-ray laserflashfurther downstream,” explains DESY scientist Daniel Rolles of the Center for Free-Electron Laser Science CFEL, a joint facility run by DESY, the University of Hamburg and the Max-Planck Society.

An especially detailed recording of the X-ray scattering patterns of the nanodroplets was made possible using the CAMP experimental vacuum chamber, developed by a Max Planck group in Hamburg at CFEL. “CAMP has two large detectors that can even register individual photons and can determine their energy very precisely," stresses Benjamin Erk of CFEL. “The detectors create a series of 120 images per second while doing so.” 

“The analyses of the images shows that a surprising number of drops were not spherical as expected, but were pulled length-wise by rapid rotation,” says Rolles. “In fact, some drops possessed more of a shape resembling a thick wheel with two almost parallel sides.” The rotation stems from the expansion of the liquid helium inside the nozzle, through which they enter the experimental chamber. The droplets rotated up to fourteen million times per second –far faster than a normal round drop could withstand according to the laws of classical physics.

Due to the rapid rotation, tiny “quantum vortices” formed within the nanodroplets, reminiscent of a miniature whirlpool swirling around a bathtub drain. This phenomenon had already been observed in larger units of superfluid helium, but has just now been detected in nanodroplets for the first time. As observed earlier, the vortices form a regular lattice. “In nanodroplets, the quantum vortices are surprisingly 100,000 times more densely packed than in the larger samples of superfluid helium that were previously studied,”says Vilesov.

“What we have observed in this experiment is really surprising,”stresses co-lead Christopher Bostedt of SLAC. The experiment’s third co-lead,  Oliver Gessner from the Lawrence Berkeley National Laboratory, adds: “Now that we have shown that we can detect and characterize quantum rotation in helium nanodroplets, it will be important to understand its origin and, ultimately, to try and control it.”

Facts, background information, dossiers
More about Deutsches Elektronen-Synchroton DESY
  • News

    Prestigious grant for imaging single molecules

    An international team of researchers, including DESY scientist Henry Chapman, has been awarded a research grant by the Human Frontier Science Program to develop a novel method for imaging individual biomolecules with atomic resolution. The team will receive a total of 1.35 million US-Dollar ... more

    Particle accelerator for the European XFEL X-ray laser operational

    The international X-ray laser European XFEL has reached one of its final major milestones on the way to scientific user operation. DESY has successfully commissioned the particle accelerator, which drives the X-ray laser along its full length.It is the world’s largest superconducting linear ... more

    Transparent ceramics

    Scientists have synthesised the first transparent sample of a popular industrial ceramic at DESY. The result is a super-hard window made of cubic silicon nitride that can potentially be used under extreme conditions like in engines, as the Japanese-German team writes in the journal Scientif ... more

Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE