Abstract
Frequencies of CO 2 laser transitions have been compared to the Cs standard by a four-step frequency chain using difference-frequencies from five CO 2 isotope lasers. A tungsten-nickel diode generates the differences and their harmonics. Measurement of the 10.71 μm R(6) transition of 13C 18O 2 is described. The absolute frequency was found to be 27 979 469.512(65) MHz. Simultaneously, the four other CO 2 frequencies in the chain were also determined.
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