# FEMTOSECOND STIMULATED EMISSION PUMPING OF BARE AND CLUSTERED $I^{-}_{2}$

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 Title: FEMTOSECOND STIMULATED EMISSION PUMPING OF BARE AND CLUSTERED $I^{-}_{2}$ Creators: Davis, Alison V.; Zanni, Martin T.; Frischkorn, Christian; Elhanine, M.; Neumark, Daniel M. Issue Date: 2000 Publisher: Ohio State University Abstract: Stimulated emission pumping in conjunction with femtosecond photoelectron spectroscopy has been used to create and monitor a coherent superposition of vibrational levels on the ground $(\tilde{X}^{2}\Sigma_{u}^{+})$ state of $I^{-}_{2}$, both $bare^{a}$ and clustered with four $CO_{2}$ $molecules^{b}$. In the bare ion, the resulting wavepacket oscillations were monitored at several excitation energies up to 0.993 eV; energy-dependent frequencies and anharmonicities were extracted which were used to fit the ground state to a modified Morse potential. In the cluster, which was studied with 0.53 eV excitation energy, the rate of energy loss to the $CO_{2}$ molecules was determined both by the increase in the wavepacket oscillation frequency ($3.8 cm^{-1}$/ps during the initial three picoseconds of coherence) and by the shift of the measured photoelectron spectrum. Description: $^{a}$M.T. Zanni, A. V. Davis, C. Frischkorn, M. Elhanine and D. M. Neumark J. Chem. Phys, submitted $^{b}$A. V. Davis, M. T, Zanni, C. Frischkorn, M. Elhanine and D. M. Neumark J. Electron Spectrosc, Retat. Phenom., submitted Author Institution: Department of Chemistry, University of California; Department of Chemistry, Laboratoire de Photophysique Mol\'{e}cutaire du CNRS URI: http://hdl.handle.net/1811/19675 Other Identifiers: 2000-MG-02