High Resolution Laser Spectroscopy of Iridium Monofluoride A

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, E 3 B 6 E 2 D. Forthomme and D. W. Tokaryk Department of Physics and the Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Fredericton, NB, E 3 B 5 A 3

Previous Work on Iridium Diatomics • Ir. O: Scullman et al. , Ber. Bunsenges. Phys. Chem 82, 92(1978). • Ir. C: Cheung et al. , Chem. Phys. Lett. 385, 259(2004), Steimle et al. , J. Chem. Phys. 104, 8183(1996) • Ir. N: 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 Ir. H and Ir. C by Balasubramanian et al. and for Ir. N by Bernath et al.

Apparatus Pulsed Valve Driver C Gas Mixture 1% SF 6 in He(g) held at 40 psi A Delay Generator B Monochromator Ablation Laser Pump Laser PMT Dye Laser Timing Scheme (repetition rate of 10 Hz): A = T 0 B = T 0 + 500 s C = T 0 + 100 s To vacuum pumps Current Amplifier Boxcar Integrator A/D Converter Computer Oscilloscope

Low Resolution Survey Two electronic systems of Ir. F found Ir. F In the red system (580 -680 nm), 7 rovibronic bands were found and subsequently analyzed Ir with 1% SF 6 reactant gas mixture 5 rovibronic bands were analyzed in the green system (490 -560 nm) Ir. F Ir. S 640 642 644 646 648 Wavelength (nm) Ir. S 650 652 654

Dispersed Fluorescence 641. 9 632. 1 2210. 4 1246. 3 620. 1 598. 4 598. 2 579. 9 Relative Wavenumbers (cm-1) 608. 9 603. 3 575. 7

Equilibrium Molecular Constants and Bond Strengths

193 Ir. F High Resolution v'-v'' = 1 -0 = 0 191 Ir. F

Electronic States 3 i v'-v'' = X 3 i 0 -1 0 -0 1 -0 2 -0 3 -0 ' = 2 3 2 ' = 3 3 3 ' = 4 3 4 '' = 2 3 2 '' = 3 3 3 '' = 4 3 4 0 -0 1 -0

Spin-Orbit Constant, A ' = 2 3 i 3 A' ' = 3 3 A' ' = 4 T 4' = T 3' = 15364. 7276(5) cm-1 15613. 5717(5) cm-1 '' = 2 X 3 i T 4' - T 3' = 3 A' '' = 3 A' = '' = 4 - 82. 9480(4) cm-1

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 Ir. H and Ir. Cl

Acknowledgements • Joyce Mac. Gregor, Dr. Colan Linton, and Dr. Tim Steimle Funding Questions?