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Fragmentation of water clusters formed in helium nanodroplets by charge transfer and Penning ionization.
De, S; Abid, A R; Asmussen, J D; Ben Ltaief, L; Sishodia, K; Ulmer, A; Pedersen, H B; Krishnan, S R; Mudrich, M.
Affiliation
  • De S; Quantum Center of Excellence for Diamond and Emergent Materials and Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
  • Abid AR; Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
  • Asmussen JD; Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
  • Ben Ltaief L; Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
  • Sishodia K; Quantum Center of Excellence for Diamond and Emergent Materials and Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
  • Ulmer A; Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
  • Pedersen HB; Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
  • Krishnan SR; Quantum Center of Excellence for Diamond and Emergent Materials and Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
  • Mudrich M; Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.
J Chem Phys ; 160(9)2024 Mar 07.
Article in En | MEDLINE | ID: mdl-38445733
ABSTRACT
Helium nanodroplets ("HNDs") are widely used for forming tailor-made clusters and molecular complexes in a cold, transparent, and weakly interacting matrix. The characterization of embedded species by mass spectrometry is often complicated by the fragmentation and trapping of ions in the HNDs. Here, we systematically study fragment ion mass spectra of HND-aggregated water and oxygen clusters following their ionization by charge transfer ionization ("CTI") and Penning ionization ("PEI"). While the efficiency of PEI of embedded clusters is lower than for CTI by about factor 10, both the mean sizes of detected water clusters and the relative yields of unprotonated cluster ions are significantly larger, making PEI a "soft ionization" scheme. However, the tendency of ions to remain bound to HNDs leads to a reduced detection efficiency for large HNDs containing >104 helium atoms. These results are instrumental in determining optimal conditions for mass spectrometry and photoionization spectroscopy of molecular complexes and clusters aggregated in HNDs.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Chem Phys Year: 2024 Type: Article Affiliation country: India

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: J Chem Phys Year: 2024 Type: Article Affiliation country: India