Ultrafast dynamics in helium nanodroplets probed by femtosecond time-resolved EUV photoelectron imaging

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The dynamics of electronically excited helium nanodroplets are studied by femtosecond time-resolved photoelectron imaging. EUV excitation into a broad absorption band centered around 23.8 eV leads to an indirect photoemission process that generates ultraslow photoelectrons. A 1.58 eV probe pulse transiently depletes the indirect photoemission signal for pump-probe time delays <200 fs and enhances the signal beyond this delay. The depletion is due to suppression of the indirect ionization process by the probe photon, which generates a broad, isotropically emitted photoelectron band. Similar time scales in the decay of the high energy photoelectron signal and the enhancement of the indirect ... continued below

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34

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Kornilov, Oleg; Wang, Chia C.; Buenermann, Oliver; Healy, Andrew T.; Leonard, Mathew; Peng, Chunte et al. July 9, 2010.

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The dynamics of electronically excited helium nanodroplets are studied by femtosecond time-resolved photoelectron imaging. EUV excitation into a broad absorption band centered around 23.8 eV leads to an indirect photoemission process that generates ultraslow photoelectrons. A 1.58 eV probe pulse transiently depletes the indirect photoemission signal for pump-probe time delays <200 fs and enhances the signal beyond this delay. The depletion is due to suppression of the indirect ionization process by the probe photon, which generates a broad, isotropically emitted photoelectron band. Similar time scales in the decay of the high energy photoelectron signal and the enhancement of the indirect photoemission signal suggest an internal relaxation process that populates states in the range of a lower energy droplet absorption band located just below the droplet ionization potential (IP {approx} 23.0 eV). A nearly 70% enhancement of the ultraslow photoelectron signal indicates that interband relaxation plays a more dominant role for the droplet de-excitation mechanism than photoemission.

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34

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  • Journal Name: Journal of Physical Chemistry A

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  • Report No.: LBNL-3718E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 985906
  • Archival Resource Key: ark:/67531/metadc1015855

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  • July 9, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 17, 2017, 7:02 p.m.

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Kornilov, Oleg; Wang, Chia C.; Buenermann, Oliver; Healy, Andrew T.; Leonard, Mathew; Peng, Chunte et al. Ultrafast dynamics in helium nanodroplets probed by femtosecond time-resolved EUV photoelectron imaging, article, July 9, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1015855/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.