Recommendation-CIPM-2007-1

Recommendation 1 of the 96th CIPM (2007)

Revision of the Mise en pratique list of recommended radiations

The International Committee for Weights and Measures,

considering that:

  • improved frequency values of molecules in the optical telecommunications region, already documented in the list of standard frequencies, have been determined by femtosecond comb-based frequency measurements;
  • frequencies of molecules in the optical telecommunications region have been determined by femtosecond comb-based frequency measurements for the first time;
  • frequencies of certain iodine gas-cell absorptions close to the 532 nm optical frequency standard have been determined by femtosecond comb-based frequency measurements for the first time;

proposes that the list of standard frequencies be revised to include the following:

  • an updated list of frequency values for the 12C2H2 (ν1 + ν3) band at 1.54 µm;
  • the addition of frequency values for the 12C2HD (2ν1) band at 1.54 µm;
  • the addition of frequency values for the hyperfine components of the P(142) 37-0, R(121) 35-0 and R(85) 33-0 iodine transitions at 532 nm.

reference The reader should note that the official version of this Resolution is the French text

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