Phys. Rev. A 70, 052505 (2004) [4 pages]Absolute-frequency measurements of the D2 line and fine-structure interval in 39KReceived 29 January 2004; revised 9 July 2004; published 22 November 2004 We report a value for the D2-line frequency of 39K with 0.28 ppb uncertainty. The frequency is measured using an evacuated ring-cavity resonator whose length is calibrated against a reference laser. The D2 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 D1 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.052505
DOI:
10.1103/PhysRevA.70.052505
PACS:
32.10.Fn, 06.30.Ft, 42.62.Eh
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