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• Atomic Clock Accuracy Boosted
  A strontium-based timekeeper providing up to 50 percent better accuracy could serve as the next-generation atomic clock.  By controlling collisions between neutral strontium atoms, the new atomic clock is said to be accurate to within one second in 300 million years, according to its inventor, Jun Ye of a joint institute formed by the U.S. NIST and the University of Colorado at Boulder.  April 16, 2009
• Mercury Atomic Clock Keeps Time with Record Accuracy
  An experimental atomic clock based on a single mercury atom is now at least five times more precise than the national standard clock based on a “fountain” of cesium atoms, according to a paper by physicists at National Institute of Standards and Technology (NIST) in Boulder, Colorado.  Their results were published in the July 14, 2006 issue of Physical Letters Review.
• A Matter of Timing: MEMS Prototype Performs Job of Quartz Crystals  July 03, 1998
• Atom-level Memory Pointing to Speed Limit
• New Atomic Clock Could Be 1,000 Times Better Than Today's Best
  Using sophisticated laser technology and a lone atom of mercury, Scientists at the National Institute of Standard and Technology (NIST) in Boulder, Colorado, developed a new type of atomic clock that produces about 1 quadrillion "ticks" per second and promises to be far more accurate than the current top standard in time measurement - cesium-based microwave atomic clocks.  July 24, 2001