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Photodissociation of I2(Ar)n Clusters Studied with Anion Femtosecond Photoelectron Spectroscopy

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Science  13 Jun 1997:
Vol. 276, Issue 5319, pp. 1675-1678
DOI: 10.1126/science.276.5319.1675

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Abstract

Anion femtosecond photoelectron spectroscopy was used to follow the dynamics of the I2 (Ar)6 and I2 (Ar)20 clusters subsequent to photodissociation of the I2 chromophore. The experiments showed that photodissociation of the I2 moiety in I2 (Ar)6 is complete by approximately 200 femtoseconds, just as in bare I2 , but also that attractive interactions between the departing anion fragment and the solvent atoms persisted for 1200 femtoseconds. Photodissociation of I2 (Ar)20 results in caging of the I2 followed by recombination and vibrational relaxation on the excited à 2Πg,3/2 and the ground 2Σu +states; these processes are complete in 35 and 200 picoseconds, respectively.

  • * These authors contributed equally to this work.

  • To whom correspondence should be addressed. E-mail: dan{at}radon.cchem.berkeley.edu

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