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  • 34.80.G  (2)
  • 33.80.Gj  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Fragmentation by electron impact ionization and intracluster reactions of size selected (N2H4) n and (OCS) n clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 181-183 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.80.G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hydrogen-bonded (N2H4) n clusters and the van der Waals (OCS) n clusters are size selected in a scattering experiment with a He beam up to the cluster sizen=6. By measuring the angular distributions of the scattered clusters the complete fragmentation pattern of electron impact ionization is obtained. For Hydrazine the two main fragment masses are the protonated species (N2H4) n−1H+ and with somewhat weaker intensities also the nominal ion mass (N2H4) n + . The largest intensity is observed for the monomer ion N2H 4 + to which clusters up ton=5 fragment. For carbonylsulfide, completely different results are obtained. Aside from the fragments of the OCS monomer and the van der Waals cluster fragments (OCS) 2 + and (OCS) 3 + signals at mass S 2 + , S 3 + and S2OCS+ are detected. This indicates a fast chemical reaction in the cluster according to: S + OCS → CO + S2 which occurs for clusters of sizen ≥ 2. Peaks at S 3 + and S2OCS+ are seen for the first time forn ≥ 5 according to a further reaction of S2 in the cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543968
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron bombardment fragmentation of size selected molecular clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 293-295 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.40 ; 34.80.G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract (CO2) n , (NO) n and (NH3) n clusters are generated in a supersonic molecular beam and size selected by scattering from an He beam. By measurements of angular dependent mass spectra, TOF distributions and the angular dependence of the scattered signal quantitative information on the fragmentation probability by electron impact is derived. The van der Waals systems (CO2) n and (NO) n appear only at masses which are simply multiples of the monomer mass. The preferred cluster ion is the monomer ion for all investigated cluster sizes withn=2 to 4. The fragment pattern for the quasi-hydrogen bonded (NH3) n -cluster shows, beside a large number of fragment masses, a preference for protonated ions. The results are explained in terms of simple models based on the structural change from the neutral to the ionized configuration and the fragmentation pattern of the monomer followed by ionmolecule reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426960
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The structure of C2H4 clusters from theoretical interaction potentials and vibrational predissociation data (1990)
    Springer
    The European physical journal 15 (1990), S. 341-351 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.01 ; 33.80.Gj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optimized geometries and binding energies are calculated for ethene (ethylene) dimers, trimers, and tetramers based on a pairwise additive dimer potential. From these results intermolecular frequencies and relative abundancies (catchment areas) of the different isomers are obtained and compared with the results of accurate measurements of the photodissociation upon absorption of one photon of a CO2 laser in the region of thev 7 monomer absorption band at 949 cm−1. The clusters are size selected in a scattering experiment and show for a cluster size fromn=2 ton=6 a frequency maximum shifted by 3 cm−1 to the blue compared with the monomer. The result is explained by the predominance of chains and chain-like structures of the clusters in the photodissociation process. The chains consist of cross-like dimer sub-units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437178
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    Paper (German National Licenses)
    Fulltext
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