Laser-excited fluorescence of gaseous Se₂studied by Fourier transform spectrometry

Fifteen series excited by Ar II 5145 AA, Ar III 3511 AA and Kr III 4131 AA in 80 Se 2 have been recorded by high-resolution Fourier transform spectrometry. Molecular constants have been determined from two independent least-squares fits, (i) of the transitions between the levels of e parity, B 0 u + , 1 u + -X 0 g + , I u + , B O u + -b 1 Sigma g + and A 0 u + -b 1 Sigma g + , (ii) of transitions between the f levels, B 1 u - -X l g - . Constants for the lower states are presented. Information about the electronic states of Se 2 is briefly reviewed.