Penning spectroscopy and structure of acetylene oligomers in He nanodroplets

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  • S. Mandal, Indian Institute of Science Education and Research
  • ,
  • R. Gopal, Tata Institute of Fundamental Research
  • ,
  • M. Shcherbinin
  • ,
  • A. D’Elia, University of Trieste
  • ,
  • H. Srinivas, Max-Planck-Institut für Kernphysik
  • ,
  • R. Richter, Elettra-Sincrotrone Trieste, Trieste,
  • M. Coreno, Elettra-Sincrotrone Trieste, Trieste, Consiglio Nazionale delle Ricerche
  • ,
  • B. Bapat, Indian Institute of Science Education and Research
  • ,
  • M. Mudrich
  • S. R. Krishnan, Indian Institute of Technology, Madras
  • ,
  • V. Sharma, Indian Institute of Technology Hyderabad
Embedded atoms or molecules in a photoexcited He nanodroplet are well-known to be ionized through inter-atomic relaxation in a Penning process. In this work, we investigate the Penning ionization of acetylene oligomers occurring from the photoexcitation bands of He nanodroplets. In close analogy to conventional Penning electron spectroscopy by thermal atomic collisions, the n = 2 photoexcitation band plays the role of the metastable atomic 1s2s 3,1S He*. This facilitates electron spectroscopy of acetylene aggregates in the sub-Kelvin He environment, providing the following insight into their structure: the molecules in the dopant cluster are loosely bound van der Waals complexes rather than forming covalent compounds. In addition, this work reveals a Penning process stemming from the n = 4 band where charge-transfer from autoionized He in the droplets is known to be the dominant relaxation channel. This allows for excited states of the remnant dopant oligomer Penning-ions to be studied. Hence, we demonstrate Penning ionization electron spectroscopy of doped droplets as an effective technique for investigating dopant oligomers which are easily formed by attachment to the host cluster.
OriginalsprogEngelsk
Artikelnummer10149-10157
TidsskriftPhysical Chemistry Chemical Physics
Vol/bind22
Nummer18
Sider (fra-til)-
ISSN1463-9076
DOI
StatusUdgivet - maj 2020

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