Photoelectron spectroscopy of large water clusters ionized by an XUV comb

Detailed knowledge about photo-induced electron dynamics in water is key to the understanding of several biological and chemical mechanisms, in particular for those resulting from ionizing radiation. Here we report a method to obtain photoelectron spectra from neutral water clusters following ioniza...

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Bibliographic Details
Published in:JPhys photonics 2020-07, Vol.2 (3), p.35007
Main Authors: Trabattoni, Andrea, Colaizzi, Lorenzo, Ban, Loren, Wanie, Vincent, Saraswathula, Krishna, Månsson, Erik P, Rupp, Philipp, Liu, Qingcao, Seiffert, Lennart, Herzig, Elisabeth A, Cartella, Andrea, Yoder, Bruce L, Légaré, François, Kling, Matthias F, Fennel, Thomas, Signorell, Ruth, Calegari, Francesca
Format: Article
Language:English
Subjects:
Attosecond pulses
Carrier gases
Clusters
extreme-ultraviolet ionisation
Feasibility studies
Ionizing radiation
photoelectron spectroscopy
Photoelectrons
Photoionization
Spectra
Spectrum analysis
water clusters
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Summary:Detailed knowledge about photo-induced electron dynamics in water is key to the understanding of several biological and chemical mechanisms, in particular for those resulting from ionizing radiation. Here we report a method to obtain photoelectron spectra from neutral water clusters following ionization by an extreme-ultraviolet (XUV) attosecond pulse train, representing a first step towards a time-resolved analysis. Typically, a large background signal in the experiment arises from water monomers and carrier gas used in the cluster source. We report a protocol to quantify this background in order to eliminate it from the experimental spectra. We disentangle the accumulated XUV photoionization signal into contributions from the background species and the photoelectron spectra from the clusters. This proof-of-principle study demonstrates feasibility of background free photoelectron spectra of neutral water clusters ionized by XUV combs and paves the way for the detailed time-resolved analysis of the underlying dynamics.
ISSN:2515-7647
2515-7647
DOI:10.1088/2515-7647/ab92b1