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Absolute frequency measurement of the lithium D lines: Precise determination of isotope shifts and fine-structure intervals

Das, Dipankar and Natarajan, Vasant (2007) Absolute frequency measurement of the lithium D lines: Precise determination of isotope shifts and fine-structure intervals. In: Physical Review A, 75 (5). 052508-1-052508-9.

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Abstract

We use a Rb-stabilized ring-cavity resonator to measure the frequencies of the D lines in $^{6,7}Li.$ Li spectroscopy is done by exciting a well-collimated atomic beam with a perpendicular diode laser beam and monitoring the resulting fluorescence. We obtain frequencies of 446 789 597.791(30) MHz and 446 800 132.006(25) MHz for the $D_1$ line and 446 799 650.653(60) MHz and 446 810 184.005(33) MHz for the $D_2$ line in the two isotopes. These values are consistent with earlier measurements, but represent an order-of-magnitude improvement in uncertainty. The measurements allow us to determine precisely the isotope shift in the D lines and the fine-structure interval in the $2P$ state, which resolve several discrepancies among earlier measurements. The small negative isotope shift in the interval appears inconsistent with theoretical estimates.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 08 Aug 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ernet.in/id/eprint/11664

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