Europhys. Lett.
Volume 63, Number 3, August 2003
Page(s) 340 - 346
Section Atomic and molecular Physics
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00543-x
Europhys. Lett., 63 (3) , pp. 340-346 (2003)

Precise measurements of UV atomic lines: Hyperfine structure and isotope shifts in the 398.8 $\un{nm}$ line of $\chem{Yb}$

A. Banerjee, U. D. Rapol, D. Das, A. Krishna and V. Natarajan

Department of Physics, Indian Institute of Science - Bangalore 560 012, India

(Received 7 January 2003; accepted in final form 5 June 2003)

We demonstrate a technique for frequency measurements of UV transitions with sub-MHz precision. The frequency is measured using a ring-cavity resonator whose length is calibrated against a reference laser locked to the D2 line of $\chem{{}^{87}Rb}$. We have used this to measure the 398.8 $\un{nm}$ ${{}^1S}_0
\leftrightarrow {{}^1P}_1$ line of atomic $\chem{Yb}$. We report isotope shifts of all the seven stable isotopes, including the rarest isotope $\chem{{}^{168}Yb}$. We have been able to resolve the overlapping $\chem{{}^{173}Yb}$ ( F = 3/2) and $\chem{{}^{172}Yb}$ transitions for the first time. We also obtain high-precision measurements of the excited-state hyperfine structure in the odd isotopes, $\chem{{}^{171}Yb}$ and $\chem{{}^{173}Yb}$. The measurements resolve several discrepancies among earlier measurements.

32.30.Jc - Visible and ultraviolet spectra.
32.10.Fn - Fine and hyperfine structure.
42.62.Fi - Laser spectroscopy.

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