Reanalysis of the A ~1∑_u~+ state of Na_2 by polarization labelling spectroscopy

摘要

The polarization labelling spectroscopy technique is applied to study the A ~1∑_u~+-X ~1∑_g~+ band system of sodium dimer. Six visible lines of an argon ion laser are used to label rovibronic levels in the ground state of Na_2. Rotationally resolved polarization spectra are observed in the range 14200-17600 cm~(-1). A set of Dunham coefficients is deduced to fit all unperturbed levels of the A ~1∑_u~+ state with 0 ≤ v ≤ 43 and 12 ≤ J ≤ 126.