High Resolution Laser Spectroscopy of Iridium Monofluoride A.G. Adam, L.E. Downie, and A.D. Granger Department of Chemistry and the Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Fredericton, NB, E3B 6E2 D. Forthomme and D.W. Tokaryk Department of Physics and the Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Fredericton, NB, E3B 5A3

Previous Work on Iridium Diatomics IrO: Scullman et al., Ber. Bunsenges. Phys. Chem 82, 92(1978). IrC: Cheung et al., Chem. Phys. Lett. 385, 259(2004), Steimle et al., J. Chem. Phys. 104, 8183(1996) IrN: Bernath et al., J. Mol. Spectrosc. 193, 363(1999), J. Mol. Spectrosc. 197, 133(1999), Steimle et al., J. Chem. Phys. 106, 2073(199), J .Chem. Phys. 104, 8183(1996) There are some theoretical calculations for IrH and IrC by Balasubramanian et al. and for IrN by Bernath et al.

Apparatus A C B PMT Gas Mixture 1% SF6 in He(g) held at 40psi Pulsed Valve Driver Gas Mixture 1% SF6 in He(g) held at 40psi A C Delay Generator B Monochromator Ablation Laser PMT Pump Laser Dye Laser Current Amplifier To vacuum pumps Timing Scheme (repetition rate of 10Hz): A = T0 B = T0 + 500s C = T0 + 100s Boxcar Integrator A/D Converter Computer Oscilloscope

Ir with 1% SF6 reactant gas mixture Low Resolution Survey Two electronic systems of IrF found In the red system (580-680nm), 7 rovibronic bands were found and subsequently analyzed 5 rovibronic bands were analyzed in the green system (490-560nm) IrF Ir with 1% SF6 reactant gas mixture IrF IrS IrS 640 642 644 646 648 650 652 654 Wavelength (nm)

Dispersed Fluorescence 641.9 632.1 1246.3 620.1 598.2 608.9 2210.4 598.4 579.9 603.3 575.7 Relative Wavenumbers (cm-1)

Equilibrium Molecular Constants and Bond Strengths

High Resolution 193IrF 191IrF v'-v'' = 1-0  = 0

Electronic States ' = 2 '' = 2 '' = 3 3i X3i 34 33 32 ' = 3 0-1 0-0 1-0 2-0 3-0 0-0 1-0 v'-v'' = ' = 4 '' = 4

Spin-Orbit Constant, A 3A' 3A' T4' - T3' = 3A' A' = - 82.9480(4) cm-1 ' = 2 3A' 3i ' = 3 3A' ' = 4 T4' = 15364.7276(5) cm-1 T3' = 15613.5717(5) cm-1 T4' - T3' = 3A' A' = - 82.9480(4) cm-1 '' = 2 X3i '' = 3 '' = 4

Case (a) - Case (c) Fit

Global Case (c) Fit

Future Work Sort out the apparent hyperfine structure The 3-0 band of the red system is perturbed and there are extra lines Next targets for comparison are IrH and IrCl

Acknowledgements Funding Questions? Joyce MacGregor, Dr. Colan Linton, and Dr. Tim Steimle Funding Questions?