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

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

2004-01-30

arxiv.org/abs/physics/0401165v1

Physical Review A 70, 052505 (2004)

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.70.052505

We report a value for the $D_2$-line frequency of $^{39}$K with 0.25 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 modelling of the measured spectrum to extract the line center and obtain a value of 391 015 578.040(75) 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(90) MHz. The results represent significant improvement over previous values.

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