Abstract
Six atomic spectral lines induced by NaRb molecules in the absorption spectrum of sodium-rubidium vapour have been observed in the wavelength range 611-641 nm. For sodium-rubidium vapour, the laser induced fluorescence spectra at laser wavelengths 616.04 and 615.81 nm and the excitation spectra at sodium D-lines with the laser scanning in the range 613.9-616.9 nm have also been measured. The possible mechanisms for the appearance of these absorption lines are discussed. © 1989 Springer-Verlag.