Abstract
Jet-cooled fluorescence excitation spectra of some new electronic band systems of the niobium dimer molecule are reported. The molecules were generated by pulsed laser vaporization of a niobium target rod and cooled by supersonic expansion in helium. Rotationally resolved spectra of four new band systems in the region 653-686 nm were obtained using a single-mode ring dye laser to excite fluorescence. The Doppler-limited experimental resolution was 200 MHz. Of the four systems observed, all of which originate from electronically excited states, three are tentatively assigned as 1Γu ← 1Γg, 3Π0± ← 3Π0±, and 3Δu ← 3Δg transitions. Results are discussed in light of theoretical predictions of the electronic structure of the Nb2 molecule.
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