Standard frequencies - TITLE
Recommended values of standard frequencies
Recommended values of standard frequencies - More information
The CIPM has charged the CCL-CCTF Frequency Standards Working Group (CCL-CCTF-WGFS) with maintaining this list of recommended values of standard frequencies for applications including the practical realization of the definition of the metre and secondary representations of the definition of the second.
info - m
All the radiations in the list (apart from the 87Rb 6.8 GHz transition) may be used for the practical realization of the definition of the metre.
The information is available in PDF format below or in machine-readable form from our API service.
info - s
The radiations marked [SRS] may be used as secondary representations of the second.
standard frequencies - related publications
The new mise en pratique for the metre – a review of approaches for the practical realization of traceable length metrology from
10−11 m to 1013 m
Schödel R., Yacoot A., Lewis A.
The CIPM list of recommended frequency standard values: guidelines and procedures
Riehle F., Gill P., Arias F., Robertsson L.
On the evaluation of ultra-high-precision frequency ratio measurements: examining closed loops in a graph theory framework
Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values
Margolis H.S., Gill P.