TITLE

Vibrational relaxation in clusters: Energy transfer in I[sub 2][sup -](CO[sub 2])[sub 4] excited by femtosecond stimulated emission pumping

AUTHOR(S)
Davis, Alison V.; Wester, Roland; Bragg, Arthur E.; Neumark, Daniel M.
PUB. DATE
September 2002
SOURCE
Journal of Chemical Physics;9/1/2002, Vol. 117 Issue 9, p4282
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Vibrational relaxation dynamics in I[sup -, sub 2](CO[sub 2])[sub 4] clusters are monitored by femtosecond stimulated emission pumping in conjunction with femtosecond photoelectron spectroscopy. Femtosecond pump and tunable dump pulses coherently excite the I[sup -, sub 2] within the cluster with vibrational energies ranging from 0.57 to 0.86 eV; the subsequent dynamics are monitored via the time-dependent photoelectron spectrum, and are compared to those resulting from excitation of bare I[sup -, sub 2]. Two observables are used to follow the vibrational relaxation from the vibrationally excited 12 to the surrounding solvent molecules. From 0 to 4 ps, relaxation is apparent through a time-dependent increase in the oscillation which is monitored at its inner turning point. At longer times, out to ∼100 ps, shifts in the photoelectron spectra are used to determine the vibrational energy content of the I[sup -, sub 2]. Indirect evidence is presented for early rapid energy loss during the first half-oscillation of the wave packet across the potential.
ACCESSION #
7273228

 

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