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| Keywords: Time & Frequency; Atomic Clocks (5881386915).jpg NIST physicist Jim Bergquist holds a portable keyboard used to set up the world's most accurate clock The silver cylinder in the foreground is a magnetic shield that surrounds a cryogenic vacuum system which in turn holds the heart of the clock a single mercury ion electrically charged atom The ion is brought to rest by laser-cooling it to near absolute zero The optical oscillations of the essentially motionless ion are used to produce the ticks or heartbeat of the world's most stable and accurate clock Copyright Geoffrey Wheeler This image may be used for any NIST purpose Correct photo credit must be provided Other organizations may use this image without charge for editorial articles that mention NIST in accompanying text or a caption Correct photo credit must be provided Stock art use requires permission and may require payment to the photographer To receive a high resolution version send an email with the image AV number 06PHY013 and title to inquiries nist gov Disclaimer Any mention of commercial products within NIST web pages is for information only; it does not imply recommendation or endorsement by NIST Use of NIST Information These World Wide Web pages are provided as a public service by the National Institute of Standards and Technology NIST With the exception of material marked as copyrighted information presented on these pages is considered public information and may be distributed or copied Use of appropriate byline/photo/image credits is requested https //www flickr com/photos/usnistgov/5881386915/ Time Frequency; Atomic Clocks 2011-06-28 11 34 https //www flickr com/people/63059536 N06 National Institute of Standards and Technology PD-USGov National Institute of Standards and Technology https //flickr com/photos/63059536 N06/5881386915 2016-09-07 02 52 42 United States Government Work Atomic clocks Laser cooling Ion traps | ||||
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