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Ultracold Plasmas Are A Chilling Puzzle

Date:
December 11, 2001
Source:
National Institute Of Standards And Technology
Summary:
Researchers at the National Institute of Standards and Technology’s Physics Laboratory have created “ultracold” plasmas—with the electrons about a degree above absolute zero—by cooling neutral atoms to within a hundred-thousandth of a degree of absolute zero and then zapping them with just enough laser energy to separate the electrons and ions to achieve the plasma state.

Plasmas, which include the bright glowy stuff in a fluorescent lamp, are clouds in which ions and free electrons move around independently as charged particles.

Plasma is thought to be the most common form of matter in the universe, but it’s usually pretty hot. The plasma in a solar corona can have a temperature in the millions of degrees.

Researchers at the National Institute of Standards and Technology’s Physics Laboratory, however, have created “ultracold” plasmas—with the electrons about a degree above absolute zero—by cooling neutral atoms to within a hundred-thousandth of a degree of absolute zero and then zapping them with just enough laser energy to separate the electrons and ions to achieve the plasma state.

One of the key measures of any plasma is the recombination rate—how fast the ions and electrons recombine to form neutral atoms.

Theory says there are three main recombination processes, and their efficiency varies in a known way with temperature and density.

However, NIST physicist Steven Rolston says that in practice, an expanding ultracold plasma recombines much faster than expected at very low densities—so much faster that no existing theory describes it.

Rolston and his group are continuing to refine their experiments to explain the behavior of ultracold plasmas, which, although they only exist in earthly labs, are thought to model the interior of white dwarf stars or gas giant planets like Jupiter.

The research also may uncover a path to synthesizing “anti-hydrogen” atoms, the antimatter equivalent of hydrogen. Precise comparisons of the properties of such antimatter twins may probe the fundamental nature of the forces that bind matter and the universe together.


Story Source:

The above story is based on materials provided by National Institute Of Standards And Technology. Note: Materials may be edited for content and length.


Cite This Page:

National Institute Of Standards And Technology. "Ultracold Plasmas Are A Chilling Puzzle." ScienceDaily. ScienceDaily, 11 December 2001. <www.sciencedaily.com/releases/2001/12/011210071925.htm>.
National Institute Of Standards And Technology. (2001, December 11). Ultracold Plasmas Are A Chilling Puzzle. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2001/12/011210071925.htm
National Institute Of Standards And Technology. "Ultracold Plasmas Are A Chilling Puzzle." ScienceDaily. www.sciencedaily.com/releases/2001/12/011210071925.htm (accessed July 31, 2014).

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