Recommendation 3 of the 10th CCL (2001)

Revision of recommended radiations

The Consultative Committee for Length,

considering that

• a number of new frequency values for radiations of high-stability cold atom and ion standards already listed on the recommended radiations list are now available;
• the frequencies of radiations of several new cold-ion species have also recently been measured;
• new and improved values for a number of optical frequency standards based on gas cells have been determined, including the wavelength region of interest to optical telecommunications;

proposes that the recommended radiations list be revised to include the following:

• updated frequency values for cold Ca, H, and the trapped Sr⁺ ion;
• frequency values for new cold-ion species including trapped Hg⁺ , trapped In⁺ and trapped Yb⁺ ;
• updated frequency values for Rb-stabilized lasers, iodine-stabilized Nd:YAG and He-Ne lasers, methane-stabilized He-Ne lasers and OsO_4- stabilized CO₂ lasers at 10 µm;
• frequency values for standards relevant to the optical communications bands, including rubidium- and acetylene-stabilized lasers.

DOI : 10.59161/CCL2001REC3E