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Rubidium time standard exciter.
An example of the element Rubidium

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Rubidium time standard exciter.
This is a small bulb that, in the original device, was positioned next the cell shown in the previous sample. It is, I am told, filled with a larger amount of rubidium than the larger cell, and serves as the the exciter, transmitting radio waves of the correct frequency to excite the lower-pressure rubidium vapor in the larger cell. (Lower pressure means narrower spectral line, and thus higher accuracy.)
Source: eBay seller nhbbobb1985
Contributor: Theodore Gray
Acquired: 19 November, 2008
Text Updated: 10 January, 2009
Price: $38
Size: 0.75"
Purity: 99.9%
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