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Mass spectroscopic studies of laser ablated carbon clusters as studied by photoionization with 10.5 eV photons under high vacuum

J. Chem. Phys. 111, 6260 (1999); doi:10.1063/1.479931

Issue Date: 8 October 1999

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Tomonari Wakabayashi, Takamasa Momose, and Tadamasa Shida
Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Neutral carbon clusters Cn (n = 1–30) produced along with ionic clusters in laser vaporized graphite are studied under high vacuum by combined use of time-of-flight (TOF) mass spectroscopy and one photon ionization with a photon energy of 10.5 eV. The TOF mass distribution pattern shows intensification of the C4n + 2 (n >= 2) clusters more clearly than the previous work by Kaizu et al. [J. Chem. Phys. 106, 9954 (1997)] who employed the same 10.5 eV photon but photoionized the neutral clusters generated by laser vaporization of graphite in helium buffer gas. The intensification is attributed to the intrinsic stability of the C4n + 2 (n >= 2) neutral clusters, probably due to the monocyclicity. Two different line shapes of the mass spectral peak are observed for one and the same cluster size. The line shape with a tailing toward longer flight times is associated with the neutral clusters produced by relatively slow fragmentation of larger clusters (n >> 30) followed by autoionization of the fragmented clusters. The other sharp line shape is associated with prompt ionization by the 10.5 eV photon. It is concluded that only the electronically excited neutral clusters are ionized for n <= 5 whereas the clusters with n > 5 are ionized irrespective of their electronic state. ©1999 American Institute of Physics.
History: Received 30 April 1999; accepted 15 July 1999
Permalink: http://link.aip.org/link/?JCPSA6/111/6260/1
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KEYWORDS and PACS

Keywords
PACS
  • 36.40.Cg
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters Electronic and magnetic properties of clusters
  • 36.40.Mr
    Studies of special atoms, molecules, and their ions; clusters Atomic and molecular clusters Spectroscopy and geometrical structure of clusters
  • 33.80.Eh
    Molecular properties and interactions with photons Photon interactions with molecules Autoionization, photoionization, and photodetachment
  • 33.15.Ta
    Molecular properties and interactions with photons Properties of molecules and molecular ions Mass spectra
  • 33.70.Jg
    Molecular properties and interactions with photons Intensities and shapes of molecular spectral lines and bands Line and band widths, shapes, and shifts
  • YEAR: 1999

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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