Precise measurements of UV atomic lines: Hyperfine structure and isotope shifts in the 398.8 line of

A. Banerjee; U. D. Rapol; D. Das; A. Krishna; V. Natarajan

doi:10.1209/epl/i2003-00543-x

All issues

Volume 63 / No 3 (August 2003)

Europhys. Lett., 63 3 (2003) 340-346

Abstract

Issue		Europhys. Lett. Volume 63, Number 3, August 2003


Page(s)		340 - 346
Section		Atomic and molecular Physics
DOI		https://doi.org/10.1209/epl/i2003-00543-x
Published online		01 November 2003

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

Corresponding author: vasant@physics.iisc.ernet.in

Received: 7 January 2003
Accepted: 5 June 2003

Abstract

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.

PACS: 32.30.Jc – Visible and ultraviolet spectra / 32.10.Fn – Fine and hyperfine structure / 42.62.Fi – Laser spectroscopy

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