TF08		15min3:29

A. J. MARR, M. E. FLORES AND T. C. STEIMLE, Dept. of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604.

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 ( < 30 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 ago^,. Numerous strong band systems in the 18800 cm^-1 to 14360 cm^-1 spectral range were assigned as the (v',0) progression of the A¹ - X¹⁺ 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(v=0) 2.78(2) D, A¹(v=1) 2.64(2) D and X¹⁺(v=0) 1.66(1) D. The (0,0) D²_7/2-X²_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: D²_7/2 (v=0) 2.61(6) D and X²_5/2 (v=0) 1.60(7) D. Plausible electronic configurations consistent with the experimental observations are given.