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High-resolution mass spectrometric study of pure helium droplets, and droplets doped with krypton

  • Topical issue: ISSPIC 15 - Structure and thermodynamics of clusters and nanoalloys
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Abstract

Mass spectra of doped and undoped helium droplets are presented. The high resolution of the time-of-flight spectrometer (m/Δm ≅ 5000) makes it possible to fully resolve small helium cluster ions from impurities and to unambiguously identify abundance anomalies in the size distribution of He n +. The yield of He4 + shows the well-known enhancement relative to other small cluster ions when the expansion changes from sub- to supercritical, provided the electron energy exceeds a value of 40 ± 1 eV, the threshold for formation of electronically excited ions. Upon doping with krypton, pure Kr n + cluster ions containing up to 41 Kr atoms are observed. The spectra exhibit abundance anomalies at 13, 16, 19, 22 & 23, 26 and 29, in agreement with spectra obtained by ionization of bare krypton clusters that are formed in neat supersonic beams. Mixed clusters He m Kr+ indicate closure of a solvation shell at m = 12.

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Authors and Affiliations

  1. Institut für Ionenphysik und Angewandte Physik and Center for Molecular Biosciences Innsbruck, Leopold Franzens Universität, 6020, Innsbruck, Austria

    H. Schöbel, P. Bartl, C. Leidlmair, S. Denifl, O. Echt, T. D. Märk & P. Scheier

  2. Department of Physics, University of New Hampshire, Durham, NH, 03820, USA

    O. Echt

  3. Department of Experimental Physics, Comenius University Bratislava, 84248, Bratislava, Slovakia

    T. D. Märk

Authors
  1. H. Schöbel
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  2. P. Bartl
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  3. C. Leidlmair
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  4. S. Denifl
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  5. O. Echt
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  6. T. D. Märk
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  7. P. Scheier
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Correspondence to O. Echt.

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Schöbel, H., Bartl, P., Leidlmair, C. et al. High-resolution mass spectrometric study of pure helium droplets, and droplets doped with krypton. Eur. Phys. J. D 63, 209–214 (2011). https://doi.org/10.1140/epjd/e2011-10619-1

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  • DOI: https://doi.org/10.1140/epjd/e2011-10619-1

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