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Nanisy sary |
Rescuing 2 sources and tagging 0 as dead.) #IABot (v2.0.8 |
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Andalana faha-24:
* [http://www.npl.co.uk/server.php?show=ConWebDoc.1086 National Physical Laboratory: ''Trapped ion optical frequency standards'' ]
* [http://resource.npl.co.uk/docs/networks/time/meeting3/klein.pdf ''High-accuracy strontium ion optical clock''; National Physical Laboratory (2005)]
* [http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#optical National Research Council of Canada: ''Optical frequency standard based on a single trapped ion''] {{Wayback|url=http://inms-ienm.nrc-cnrc.gc.ca/research/optical_frequency_projects_e.html#optical |date=20080314011450 }}
* [http://physics.nist.gov/cuu/Units/second.html NIST: ''Definition of the second''; notice the cesium atom must be in its ground state at 0 K]
* [http://www.bipm.org/en/si/si_brochure/chapter2/2-1/second.html Official BIPM definition of the second]
* [http://tycho.usno.navy.mil/leapsec.html Seconds and leap seconds by the USNO]* [http://www.cl.cam.ac.uk/~mgk25/time/metrologia-leapsecond.pdf The leap second: its history and possible future]
* [http://inms-ienm.nrc-cnrc.gc.ca/faq_time_e.html#10 ''What is a Cesium atom clock?''] {{Wayback|url=http://inms-ienm.nrc-cnrc.gc.ca/faq_time_e.html#10 |date=20090220155423 }}
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