From: Magnus Danielson <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Hyperfine splittings Date: Wed, 08 Nov 2006 09:35:09 +0100 (CET) Message-ID: <[EMAIL PROTECTED]>
Dear fellow time-nuts, I have now upgraded my list of hyperfine splittings at http://rubidium.dyndns.org/~magnus/physics/hyperfine/ There is a number of improvements. For Hydrogen I maintain a few multiples, but is considering just adding the reference list up with those details and maintain the best estimate that I know of. Also lacking a bunch of references, even if I have them lying around. Well, it is work in progress. > > I have 1 420 405 751.768 ± 0.002 Hz for > > hydrogen at my "hyperfine" page: > > > > http://www.leapsecond.com/pages/unix/ > > Yes, but do you have a reference for that one? Preferably an open source. This appears to be the older estimate from H. Hellwig, R.C. Vessot, M.W. Levine, P.W. Zitzewitz, D.W. Allan and D.J. Glaze "Measurement of the Unperturbed Hydrogen Hyperfine Transition Frequency" IEEE T. Instrum. Meas. 19 p200-209 http://www.tf.nist.gov/timefreq/general/pdf/13.pdf A good read on a rainy day if you want to learn on how you remove wall shift errors from your estimate. Anyway, Jacques Vanier and Claude Audoin presents the value of 1 420 405 751.770 +/- 0.003 Hz as a result of 12 different papers ranging from 1963 to 1980. However, they do not include the above paper. Cheers, Magnus _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
