On Fri, 15 Dec 2017 17:17:31 +0100 Mike Cook <michael.c...@sfr.fr> wrote:
> > The original paper in question is [1]. As with the nitrogen vacancy > > clocks, which also trap nitrogen within a Carbon lattice, these have the > > drawback of quite high temperature coefficients, Harding et al measured > > 89ppm/K. > > I wonder if Cs-133 can be inserted into C-60 fullerene? If it could, > then a primary reference on a chip might be possible. No, it wouldn't. It isn't the species of atom being used that defines whether it is a primary standard or not, but rather that it is possible to exactly calculate the frequency of the output given all disturbances. It is possible to achieve this with Cs, Rb, Hg, Yb, Sr, ... it just depends on how you do it. The problem with the atom-in-fullerene is that the atom is not in (a good approximation of) vacuum, as it is surrounded by a molecule in close proximity. This means the surrounding atoms disturb the electrons of the probed atom. This is what causes the large temperature dependence. Attila Kinali -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ 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.