Femtosecond photoelectron spectroscopy of I{sub 2}{sup -}(Ar){sub n} clusters (n=6,9,12,16,20)
- Department of Chemistry, University of California, Berkeley, California 94720 (United States)
The photodissociation of I{sub 2}{sup -} embedded in mass-selected I{sub 2}{sup -}(Ar){sub n} clusters (n=6-20) was studied using femtosecond photoelectron spectroscopy. The A(tilde sign){sup '}(leftarrow)X(tilde sign) transition in the I{sub 2}{sup -} chromophore was excited using a femtosecond pump pulse, and the subsequent dynamics were followed by photodetachment with a femtosecond probe pulse and measurement of the resulting photoelectron spectrum. In all clusters, dissociation of the I{sub 2}{sup -} is complete by 300 fs. From 300 fs to 1 ps, the spectra yield the number of Ar atoms interacting with the I{sup -} fragment. At later times, recombination of I{sub 2}{sup -} occurs in I{sub 2}{sup -}(Ar){sub n{>=}}{sub 12} on both the X(tilde sign) and A(tilde sign) states. Analysis of the spectra yields the time scale for X(tilde sign) state vibrational relaxation and solvent evaporation. In I{sub 2}{sup -}(Ar){sub 20}, energy transfer from I{sub 2}{sup -} to Ar atoms through vibrational relaxation is slightly faster than energy loss from the cluster through Ar evaporation, indicating the temporary storage of energy within Ar cluster modes. (c) 1999 American Institute of Physics.
- OSTI ID:
- 20217884
- Journal Information:
- Journal of Chemical Physics, Vol. 111, Issue 23; Other Information: PBD: 15 Dec 1999; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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