H R Simonsen and F Rose 2000 Metrologia 37 651 doi:10.1088/0026-1394/37/6/2
H R Simonsen and F Rose
Show affiliationsWith the aid of two diode-laser narrowband spectrometers around 633 nm, we report the measurement of the iodine hyperfine components of the R(60) 8-4, R(125) 9-4 and P(54) 8-4 transitions located −12 GHz from the classical red He-Ne laser stabilized on the R(127) 11-5 transition of 127I2, the P(33) 6-3 transition roughly −1 GHz away, the P(39) 6-3 transition 3.4 GHz above, and the R(59) 8-4 and P(53) 8-4 transitions roughly 19 GHz above. The Doppler-free absorption signals were resolved using a third-harmonic detection technique and hyperfine frequency splittings were measured by beat-frequency techniques. The individual hyperfine transitions were linked to a 633 nm He-Ne laser by direct frequency measurements up to 16 GHz. The experimental standard uncertainty was typically below 5 kHz (i.e. relative uncertainty <1 × 10−11).
33.15.Pw Fine and hyperfine structure
06.20.Dk Measurement and error theory
Issue 6 (December 2000)
H R Simonsen and F Rose 2000 Metrologia 37 651
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