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Supercool helium ions make their debut Physicists in Germany have produced large numbers of ultracold helium ions for the first time. The helium ions could be used to search for variations in the values of the fundamental constants and to test various effects in quantum electrodynamics (QED). Established laser cooling techniques do not work for helium so Stephan Schiller and colleagues at Heinrich-Heine University in Düsseldorf had to use a technique called "sympathetic cooling" instead.
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