  Cesium atomic clock closeup. 
This is a closeup view of the component tower in the cesium atomic clock on a chip described in the previous sample.  Watch the "Spin" video to really get a good view of this thing. 
Source: NIST 
Contributor: NIST 
Acquired: 24 March, 2009 
Text Updated: 24 March, 2009 
Price: Loan 
Size: 0.25" 
Purity: <1%
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