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 frequency stability.
John WA4WDL ----- Original Message ----- From: "Luis Cupido" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Sunday, June 29, 2008 11:40 AM Subject: [time-nuts] Home built Ammonia cell std !! / Home built cesiumclocks??? > 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. > ct1dmk. > > (I understand the frequencies are much higher > but that is not a problem, at least for me). > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
