DOI: 10.1126/science.284.5414.635. Electron Solvation in Finite Systems: Femtosecond Dynamics of Iodide·(Water) <sub> <i>n</i> </sub> Anion Clusters

Electron Solvation in Finite Systems: Femtosecond Dynamics of Iodide·(Water) n Anion Clusters

10.1126/science.284.5414.635

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

Electron solvation dynamics in photoexcited anion clusters of I − (D 2 O) n =4–6 and I − (H 2 O) 4–6 were probed by using femtosecond photoelectron spectroscopy (FPES). An ultrafast pump pulse excited the anion to the cluster analog of the charge-transfer-to-solvent state seen for I − in aqueous solution. Evolution of this state was monitored by time-resolved photoelectron spectroscopy using an ultrafast probe pulse. The excited n = 4 clusters showed simple population decay, but in the n = 5 and 6 clusters the solvent molecules rearranged to stabilize and localize the excess electron, showing characteristics associated with electron solvation dynamics in bulk water. Comparison of the FPES of I − (D 2 O) n with I − (H 2 O) n indicates more rapid solvation in the H 2 O clusters.

Bibliography

Lehr, L., Zanni, M. T., Frischkorn, C., Weinkauf, R., & Neumark, D. M. (1999). Electron Solvation in Finite Systems: Femtosecond Dynamics of IodideÂ·(Water) n Anion Clusters. Science, 284(5414), 635â638.

Authors 5

L. Lehr (first)
M. T. Zanni (additional)
C. Frischkorn (additional)
R. Weinkauf (additional)
D. M. Neumark (additional)

References 31 Referenced 226

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Briefly a pulsed beam of cold I − (D 2 O) n anion clusters is formed by crossing an electron beam with a pulsed supersonic expansion of a gas mixture of about 5% CH 3 I and 2% D 2 O (or H 2 O) in 1 bar N 2 into a vacuum chamber. The resulting anions are mass selected by time of flight and interact with the pump and probe laser pulses at the focus of a “magnetic bottle” time-of-flight PE spectrometer. The pump and probe laser pulses were generated by a Ti:sapphire oscillator-regenerative amplifier system (Clark MXR) running at a repetition rate of 500 Hz.
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Supported by the Air Force Office of Scientific Research under grant F49620-97-0018. R.W. acknowledges funding by the Deutsche Forschungsgemeinschaft. C.F. acknowledges postdoctoral support from the Deutsche Akademie der Naturforscher Leopoldina (grant BMBF-LPD 9801-6). L.L. acknowledges financial support by E. W. Schlag.

Dates

Type	When
Created	23 years, 1 month ago (July 27, 2002, 5:49 a.m.)
Deposited	1 year, 7 months ago (Jan. 13, 2024, 4:22 a.m.)
Indexed	1 month, 4 weeks ago (July 2, 2025, 3:52 a.m.)
Issued	26 years, 4 months ago (April 23, 1999)
Published	26 years, 4 months ago (April 23, 1999)
Published Print	26 years, 4 months ago (April 23, 1999)

Funders 0

None

BibTeX

@article{Lehr_1999, title={Electron Solvation in Finite Systems: Femtosecond Dynamics of Iodide·(Water) n Anion Clusters}, volume={284}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.284.5414.635}, DOI={10.1126/science.284.5414.635}, number={5414}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Lehr, L. and Zanni, M. T. and Frischkorn, C. and Weinkauf, R. and Neumark, D. M.}, year={1999}, month=apr, pages={635–638} }

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