[time-nuts] Home built Ammonia cell std !! / Home built cesiumclocks???
jmfranke at cox.net
Sun Jun 29 12:20:28 EDT 2008
Now that is something I am interested in doing. I finally secured use of a
diffusion pump at a local university and expect to be making my first sealed
all-glass absorption cells this fall. The ammonia pressure needs to be
around 8-10 microns. I will be trying for a double pass cell giving a pass
length between 10 and 12 feet. The first ammonia atomic clock used a path
length of 33 feet. The cell was made from waveguide and did not hold a
charge due to leaks or the ammonia reacting with the gold plated waveguide.
I believe the best ammonia based standard was only good to 10 ^ -8 in
----- Original Message -----
From: "Luis Cupido" <cupido at mail.ua.pt>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, June 29, 2008 11:40 AM
Subject: [time-nuts] Home built Ammonia cell std !! / Home built
> We dont get much info/comments about this
> But what would an ammonia cell standard be able to do.
> I mean frequency/time wise.
> Maybe easier and simpler ?
> comments ?
> Luis Cupido.
> (I understand the frequencies are much higher
> but that is not a problem, at least for me).
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