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J Phys Chem Lett. 2016 Feb 18;7(4):609-15. doi: 10.1021/acs.jpclett.5b02772. Epub 2016 Jan 28.

Materials Properties and Solvated Electron Dynamics of Isolated Nanoparticles and Nanodroplets Probed with Ultrafast Extreme Ultraviolet Beams.

Author information

1
JILA-NIST and Department of Physics, University of Colorado , 440 UCB, Boulder, Colorado 80309, United States.
2
Department of Chemistry and Biochemistry, University of California San Diego , La Jolla, California 92093, United States.
3
CIRES and Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States.
4
Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States.

Abstract

We present ultrafast photoemission measurements of isolated nanoparticles in vacuum using extreme ultraviolet (EUV) light produced through high harmonic generation. Surface-selective static EUV photoemission measurements were performed on nanoparticles with a wide array of compositions, ranging from ionic crystals to nanodroplets of organic material. We find that the total photoelectron yield varies greatly with nanoparticle composition and provides insight into material properties such as the electron mean free path and effective mass. Additionally, we conduct time-resolved photoelectron yield measurements of isolated oleylamine nanodroplets, observing that EUV photons can create solvated electrons in liquid nanodroplets. Using photoemission from a time-delayed 790 nm pulse, we observe that a solvated electron is produced in an excited state and subsequently relaxes to its ground state with a lifetime of 151 ± 31 fs. This work demonstrates that femotosecond EUV photoemission is a versatile surface-sensitive probe of the properties and ultrafast dynamics of isolated nanoparticles.

PMID:
26807653
DOI:
10.1021/acs.jpclett.5b02772
[Indexed for MEDLINE]

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