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Absolute-frequency measurements of the $D_2$ line and fine-structure interval in $^{39}K$

Banerjee, Ayan and Natarajan, Vasant (2004) Absolute-frequency measurements of the $D_2$ line and fine-structure interval in $^{39}K$. In: Physical Review A, 70 (5). 052505/1-052505/4.

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We report a value for the $D_2$-line frequency of $^{39}K$ with 0.28 ppb uncertainty. The frequency is measured using an evacuated ring-cavity resonator whose length is calibrated against a reference laser. The $D_2$ line presents a problem in identifying the line center because the closely spaced energy levels of the excited state are not resolved. We use computer modeling of the measured spectrum to extract the line center and obtain a value of 391 015 578.040(110) MHz. In conjunction with our previous measurement of the $D_1$ line, we determine the fine-structure interval in the 4P state to be 1 729 997.132(120)MHz. The results represent significant improvement over previous values.

Item Type: Journal Article
Publication: Physical Review A
Publisher: The American Physical Society
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Oct 2007
Last Modified: 19 Sep 2010 04:40
URI: http://eprints.iisc.ac.in/id/eprint/12343

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