Reanalysis of the A 1 Sigma +u state of Na2 by polarization labelling spectroscopy

Abstract

The polarization labelling spectroscopy technique is applied to study the A ¹Σu + – X ¹Σg + band system of sodium dimer. Six visible lines of an argon ion laser are used to label rovibronic levels in the ground state of Na2. 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 ¹Σu + state with 0 ⩽ ν ⩽ 43 and 12 ⩽ J ⩽ 126.