[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

[Mike Cook]

> Le 15 déc. 2017 à 14:06, Attila Kinali <attila at kinali.ch> a écrit :
> 
> On Fri, 8 Dec 2017 09:40:29 -0800
> Tom McDermott <tom.n5eg at gmail.com> wrote:
> 
>> Researchers at Oxford U. have fabricated an atomic reference based on
>> a single nitrogen molecule inside a 60-atom carbon sphere ("Fullerene").
>> The cage of carbon isolates the nitrogen from external electric fields,
>> and they've developed a method to also isolate it from external magnetic
>> fields.
> 
> 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.

> 
> 			Attila Kinali
> 
> 
> [1] "Spin Resonance Clock Transition of the Endohedral Fullerene 15N at C60",
> by Harding, Zhou, Zhou, Myers, Ardavan, Briggs, Porfyrakis, Laird, 2017
> https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.140801
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