Accurate spectroscopy of Sr atoms
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Revised: 31 January 2005
Published online: 3 May 2005
We report the frequency measurement with an accuracy in the 100 kHz range of several optical transitions of atomic Sr: at 689 nm, at 688 nm and at 679 nm. Measurements are performed with a frequency chain based on a femtosecond laser referenced to primary frequency standards. They allowed the indirect determination with a 70 kHz uncertainty of the frequency of the doubly forbidden transition of 87Sr at 698 nm and in a second step its direct observation. Frequency measurements are performed for 88Sr and 87Sr, allowing the determination of , and isotope shifts, as well as the hyperfine constants.
PACS: 06.30.Ft – Time and frequency / 32.30.Jc – Visible and ultraviolet spectra / 39.30.+w – Spectroscopic techniques / 32.80.-t – Photon interactions with atoms
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005