Absolute frequency measurements of the lines in , , and with uncertainty

A. Banerjee; D. Das; V. Natarajan

doi:10.1209/epl/i2003-10069-3

All issues

Volume 65 / No 2 (January 2004)

Europhys. Lett., 65 2 (2004) 172-178

Abstract

Issue		Europhys. Lett. Volume 65, Number 2, January 2004


Page(s)		172 - 178
Section		General
DOI		https://doi.org/10.1209/epl/i2003-10069-3
Published online		01 January 2004

Europhys. Lett., 65 (2), pp. 172-178 (2004)

Absolute frequency measurements of the ${D_1}$ lines in $\chem{{}^{39}K}$ , $\chem{{}^{85}Rb}$ , and $\chem{{}^{87}Rb}$ with ${\sim 0.1}$ $\un{ppb}$ uncertainty

A. Banerjee, D. Das and V. Natarajan

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

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

Received: 11 August 2003
Accepted: 7 November 2003

Abstract

We report values for the D₁-line frequencies with 0.13 $\un{ppb}$ uncertainty in the alkali atoms $\chem{{}^{39}K}$ , $\chem{{}^{85}Rb}$ , and $\chem{{}^{87}Rb}$ . The frequencies are measured using an evacuated ring-cavity resonator whose length is calibrated against a reference laser locked to the D₂ line in $\chem{{}^{87}Rb}$ . The measured frequencies, along with sub-ppb measurement of the atomic masses reported previously, form important links in a possible high-precision determination of the fine-structure constant using the photon-recoil shift measured in an atom interferometer. We also obtain, with improved precision, the hyperfine-coupling constants in the $P_{1/2}$ state of these atoms, and the fine-structure interval in the $5P$ state of $\chem{Rb}$ .

PACS: 06.30.Ft – Time and frequency / 06.20.Jr – Determination of fundamental constants / 32.10.Fn – Fine and hyperfine structure

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