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

Banerjee, A and Das, D and Natarajan, V (2004) Absolute frequency measurements of the $D_1$ lines in $^{39}K, ^{85}Rb,$ and $^{87}Rb$ with $\sim$ 0.1 ppb uncertainty. In: Europhysics Letters, 65 (2). pp. 172-178.

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We report values for the $D_1$-line frequencies with 0.13 ppb uncertainty in the alkali atoms $^{39}K, ^{85}Rb,$ and $^{87}Rb.$ The frequencies are measured using an evacuated ringcavity resonator whose length is calibrated against a reference laser locked to the $D_2$ line in $^{87}Rb.$ 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 Rb.

Item Type: Journal Article
Publication: Europhysics Letters
Publisher: EDP
Additional Information: The copyright belongs to EDP Sciences.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 Apr 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ac.in/id/eprint/6505

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