Knowledge Bank

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 ( MHz FWHM) laser induced fluorescence spectroscopy. This is the first identification of gaseous IrN. The conventional high temperature spectra of IrC was recorded some time $agoa,b$. Numerous strong band systems in the $18800cm-1$ to $14360cm-1$ spectral range were assigned as the ($\nu \prime ,0$) progression of the $A1\Pi -X~1\Sigma +$ 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) branch features of these bands were analyzed to produce permanent electric dipole moments: $A1\Pi (\nu =0)2.78(2)D,A~1\Pi (v=1)2.64(2)D$ and $X~1\Sigma +1.66(1)$ D. The (0,0) $D~2\Phi 7/2-X~2\Delta 5/2$ band 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: $D~2\Phi 2/3(v=0)2.61(6)$D and $X~2\Delta 3/2(v=0)1.60(7)$ . Plausible electronic configurations consistent with the experimental observations are given.