title: Absolute transition frequencies and quantum interference in a frequency comb based measurement of the (6,7)Li D lines.
abstract: Optical frequencies of the D lines of (6,7)Li were measured with a relative accuracy of 5 × 10⁻¹¹ using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially resolved D2 lines was found to produce polarization dependent shifts as large as 1 MHz. Our results resolve large discrepancies among previous experiments and between all experiments and theory. The fine-structure splittings for ⁶Li and ⁷Li are 10052.837(22) MHz and 10053.435(21) MHz. The splitting isotope shift is 0.599(30) MHz, in reasonable agreement with recent theoretical calculations.
authors.affiliation: National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Sansonetti
authors.forename: C E
authors.initials: CE
authors.lastname: Simien
authors.forename: J D
authors.initials: JD
authors.lastname: Gillaspy
authors.forename: Joseph N
authors.initials: JN
authors.lastname: Tan
authors.forename: Samuel M
authors.initials: SM
authors.lastname: Brewer
authors.forename: Roger C
authors.initials: RC
authors.lastname: Brown
authors.forename: Saijun
authors.initials: S
authors.lastname: Wu
authors.forename: J V
authors.initials: JV
authors.lastname: Porto