https://doi.org/10.1140/epjd/e2005-00058-0
Accurate spectroscopy of Sr atoms
BNM-SYRTE,
Observatoire de Paris, 61 avenue de l'observatoire, 75014
Paris, France
Corresponding author: a pierre.lemonde@obspm.fr
Received:
16
October
2004
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
