Recommendation-CIPM-2005-3

Recommendation 3 of the 94th CIPM (2005)

Revision of the Mise en pratique list of recommended radiations

The International Committee for Weights and Measures (CIPM),

considering that:

  • improved frequency values for radiations of some high-stability cold ion and cold atom standards already documented in the recommended radiations list have recently become available;
  • improved frequency values for the infra-red gas-cell-based optical frequency standard in the optical telecommunications region, already documented in the recommended radiations list, have been determined;
  • improved frequency values for certain iodine gas-cell standard, already documented in the subsidiary recommended source list, have been determined;
  • frequencies of new cold atoms, of atoms in the near-infrared region and of molecules in the optical telecommunications region have been determined by femtosecond comb-based frequency measurements for the first time;

decides that the list of recommended radiations be revised to include the following:

  • updated frequency values for the single trapped 88Sr+ ion quadrupole transition, the single trapped 199Hg+ quadrupole transition and the single trapped 171Yb+ quadrupole transition;
  • an updated frequency value for the Ca atom transition;
  • an updated frequency value for the C2H2-stabilized standard at 1.54 µ
  • an updated frequency value for the I2-stabilized standard at 515 nm;
  • the addition of the 87   Sr atom transition at 698 nm;
  • the addition of the 87  Rb atom two-photon transitions at 760 nm;
  • the addition of the 12C2H2 (ν1 + ν3) band and the 13C2H2 (ν1 + ν3) and (ν1 + ν3 + ν4 + ν5) bands at 1.54 µm.

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

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