15min:

LORENA PITICCO, MARTIN SCHÄFER AND FRÉDÉRIC MERKT, ETH Zürich, Laboratorium für Physikalische Chemie, Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland.

Rotationally resolved (1+1') resonance-enhanced two-photon ionization spectra of the D and C X 0⁺ band systems of several isotopomers of ArXe and KrXe were recorded using a narrow-bandwidth VUV laser system\footnote U. Hollenstein, H. Palm and F. Merkt, Rev. Sci. Instr. \textbf71, 4023 (2000). at a resolution of 0.01 cm^-1 in the wave number range from 77000 cm^-1 to 77400 cm^-1\footnote L. Piticco, F. Merkt, A. A. Cholewinski, F. R. W. Mc Court and R. J. Le Roy, J. Mol. Spectrosc. \textbf264, 83 (2010).. The analysis of the rotational structures enabled the characterization of the dissociation of the = 1 states of ArXe and KrXe\footnote S. Liu, A. Hishikawa and K. Yamanouchi, J. Chem. Phys. \textbf108, 5330 (1998).. In the case of Rg¹²⁹Xe and Rg¹³¹Xe (Rg=Ar, Kr), the hyperfine structure could also be resolved and provided new information on these states, and on the nature of the perturbations\footnote A. P. Hickman, D. L. Huestis and R. P. Saxon, J. Chem. Phys. \textbf96, 2099 (1992).^,\footnote D. M. Mao, X. K. Hu, S. S. Dimov and R. H. Lipson, J. Phys. B \textbf29, L89 (1996).. Model potentials for the perturbing and perturbed excited states were constructed in an attempt to rationalize the spectroscopic data. The spectra of the C and D states of ArXe and KrXe reveal strong perturbations^(c-e), and are subject to slow predissociation.