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Il Nuovo Cimento A (1971-1996)

, Volume 110, Issue 9–10, pp 1215–1222 | Cite as

Multifragmentation of molecules and clusters

  • U. Werner
  • V. N. Kondratyev
  • H. O. Lutz
Article

Summary

The multiple ionization and fragmentation of small polyatomic molecules and clusters,e.g. H2O, CH4, and C60 by fast H+, He+, and Oq+ ions were studied utilizing a position- and time-sensitive multiparticle detector which allows the coincident measurement of the momenta of correlated fragments. Thereby, akinematically complete image of the molecular break-up can be derived for each individual event. Of special interest are the “Coulomb explosion” processes, like H2 O→ H++ H++Oq+, where the measured dissociation energies and angular correlations show significant deviations from the pure Coulomb explosion model. For larger molecules and clusters, new phenomena may be expected. For example, using a classical molecular dynamics simulation, we have studied the break-up of hot Arn (n ≥ 100) clusters. For initial temperatures around 500 K various analytical tools consistently indicate critical behaviour in the expansion phase.

PACS 34.50.Gb

Electronic excitation and ionization of molecules 

PACS 36.40.Qv

Stability and fragmentation of clusters 

PACS 01.30.Cc

Conference proceedings 

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Copyright information

© Società Italiana di Fisica 1997

Authors and Affiliations

  • U. Werner
    • 1
  • V. N. Kondratyev
    • 2
  • H. O. Lutz
    • 1
  1. 1.Fakultät für PhysikUniversität BielefeldBielefeldGermany
  2. 2.Advanced Science Research Center, JAERITokai, NakaJapan

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