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Observation of resonant two-photon photodetachment of water cluster anions via femtosecond photoelectron spectroscopy

  • J. M. Weber*
  • , J. Kim
  • , E. A. Woronowicz
  • , G. H. Weddle
  • , I. Becker
  • , O. Cheshnovsky
  • , M. A. Johnson
  • *Corresponding author for this work
  • Yale University
  • Fairfield University
  • Tel Aviv University

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Photoexcitation of the (H2O)-n (n=20-100) clusters with 100 fs pulses at 800 nm results in an increasing propensity for two-photon electron photoejection with increasing cluster size. This increase correlates with the size range (n≈30) where the first excited electronic state drops below the electron continuum, and the electronic absorption band approaches the energy of the 800 nm pump photon. No above-threshold, two-photon detachment is observed for n=20. Differences in the shape of the resonant two-photon photoelectron spectrum compared to that arising from direct (high energy) photodetachment are interpreted in terms of the vibrational state selection created in the resonant step.

Original languageEnglish
Pages (from-to)337-342
Number of pages6
JournalChemical Physics Letters
Volume339
Issue number5-6
DOIs
StatePublished - 18 May 2001

Funding

Funders
US–Israel Binational Science Foundation
National Science Foundation
U.S. Department of Energy

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