Electronic transitions of iridium monoboride

Electronic transition spectrum of iridium monoboride in the spectral region between 400 and 545 nm has been recorded and analyzed using laser vaporization/reaction free jet expansion source and laser induced fluorescence spectroscopy. Thirteen vibrational bands belonging to four electronic transitions, namely the [18.8]3Δ3 – X3Δ3, [21.1]3Φ4 – X3Δ3, [22.8]3Φ3 – X3Δ3, and [22.4]1Φ3 – a1Δ2 transitions, have been identified and rotationally analyzed. Spectra of all four isotopic molecules were observed.