Lux, Jim (337C) wrote:
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Brooks Shera
Sent: Tuesday, August 04, 2009 1:53 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] A better atomic clock design just published
If your wristwatch was as accurate as today's atomic clocks, it would
not
gain or lose a second in 80 million years. In the United States,
announcements of time come from Boulder, Colorado, which houses the
atomic
fountain clock that defines the second as 9,192,631,770 oscillations
between
the hyperfine ground states of the cesium atom.
But some folks DO have atomic wristwatches <grin>. Of course, that wasn't a
fountain clock, either.
An atomic fountain wristwatch would be sparkling for all the wrong
reasons as the Caesium reacts with the air. :)
Wouldn't like to have some Caesium spill onto my arm...
The use of 171Yb+ is not new, work has been ongoing for some time.
12.642812118466(2) GHz is the frequency I have notted down. Hmm, should
update that page. The release does not say anything about ions, but then
again, I am quite sure whoever wrote that isn't deeply into the subject.
Cheers,
Magnus
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