[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference
Attila Kinali
attila at kinali.ch
Fri Dec 15 08:06:41 EST 2017
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.
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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