Dr Steinhauer and his colleagues created a condensate out of a gas of rubidium atoms held in a magnetictrap.
Steinhauer博士和同事从盛在磁圈里的铷原子气体中制出冷凝物。
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To detect such a tiny force, the NIST team confined about 60 ultra-cold beryllium ions in a device called a Penning trap, which USES magnetic and electric fields to imprison charged particles.