Precise measurement of hyperfine structure in the 2P{sub 1/2} state of {sup 7}Li using saturated-absorption spectroscopy
Physical Review A(2010)
摘要
We report a precise measurement of the hyperfine interval in the ${2P}_{1/2}$
state of $^{7}$Li. The transition from the ground state ($D_1$ line) is
accessed using a diode laser and the technique of saturated-absorption
spectroscopy in hot Li vapor. The interval is measured by locking an
acousto-optic modulator to the frequency difference between the two hyperfine
peaks. The measured interval of 92.040(6)~MHz is consistent with an earlier
measurement reported by us using an atomic-beam spectrometer [Das and
Natarajan, J.\ Phys.\ B {\bf 41}, 035001 (2008)]. The interval yields the
magnetic dipole constant in the $P_{1/2}$ state as $A=46.047(3)$, which is
discrepant from theoretical calculations by $>80$~kHz.
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关键词
hyperfine structure,fine structure,ground state,energy levels,absorption spectroscopy,stable isotope
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