- Conference date: 6–10 October 2008
- Location: Nagoya (Japan)
Absolute measurements of spectral lines of ions using collinear and anticollinear geometries were performed. To provide a precise reference for the laser wavelength, iodine saturation spectroscopy was applied. The precision of this reference is effected by observing the beat node between the spectroscopy laser and the corresponding mode of a femtosecond laser frequency comb. Laser‐induced fluorescence allowed to perform precision frequency measurements of an transition in collinear and anticollinear geometries simultaneously; then an exact relativistic formula for the absolute transition frequency was used. In this geometry the influence of ion source instabilities due to pressure and anode voltage fluctuations was minimized. The result is which corresponds to This represents an improvement of two orders of magnitude over the previous NIST published value.
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