The optical and optical/Stark spectrum of iridium monocarbide and mononitride

Supersonic molecular beam samples of iridium monocarbide IrC and iridium mononitride IrN were generated using a laser ablation/reaction source and characterized using high resolution (Δν<30 MHz FWHM) laser induced fluorescence spectroscopy. This is the first identification of gaseous IrN. Numerous strong band systems in the 18 800 to 14 360 cm-1 spectral range were assigned as the (v′,0) progression of the A ¹Π-Χ ¹Σ⁺ band system of IrN. The (1,0) and (0,0) bands were analyzed to produce a set of fine and hyperfine parameters. The electric field induced effects on the R(0) line of these bands were analyzed to produce permanent electric dipole moments: A ¹Π(v = 0) 2.78(2) D, A ¹Π(v = 1) 2.64(2) D, Χ ¹Σ⁺(v = 0) = 1.66(1) D. The (0,0) band of the D² Φ_7/2-Χ ²Δ_5/2 system of IrC was recorded and analyzed to produce a set of fine and hyperfine parameters. The electric field induced effects on the R(2.5) branch feature were analyzed to produce permanent electric dipole moments: D ²Φ_7/2(v = 0) 2.61(6) D and Χ ²Δ_5/2(v = 0) 1.60(7) D. Plausible electronic configurations consistent with the experimental observations are given.