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  • 1
    Electronic Resource
    Electronic Resource
    Collision-induced reactions of size-selected molecular cluster anions (1993)
    Springer
    The European physical journal 26 (1993), S. 223-225 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Collision-induced reactions of size-selected cluster anions, (CO2) n − and (N2O)nO− with He and Kr atoms were studied at collision energies from 0.1 to 2.0 eV (center-of mass) by means of a tandem mass-spectrometer equipped with a pair of octapole ion guides. The dominant process was evaporation of the constituent molecules from the parent cluster ion. The absolute cross section for the evaporation was measured as functions of the size of the parent cluster ion and the collision energy. The reaction was explained by collisional excitation of the parent cluster ion followed by its unimolecular dissociation. The observed cross sections which correspond to those for the collisional excitation agree with those calculated in terms of charge-induced dipole and induced dipole-induced dipole interactions between the parent cluster ion and the target atom. The distributions of the product ions resulting from the unimolecular dissociation were reproduced by a simple calculation based on RRK theory. In the collision of (CO2) n − , the cross sections for (CO2) 10 − and (CO2) 14 − were significantly small and their abundances in the product ion distributions were particularly large. These findings indicate that (CO2) 10 − and (CO2) 14 − are stable species. On the other hand, stable species in (N2O)nO− was found to be (N2O)5O−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429151
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  • 2
    Electronic Resource
    Electronic Resource
    Frequencies of breathing vibrations of nearly spherical Ar clusters calculated by molecular dynamics (1991)
    Springer
    The European physical journal 20 (1991), S. 161-162 
    Details
    ISSN: 1434-6079
    Keywords: 31.20 − d ; 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The breathing vibration of Ar N cluster,N=13, 20, 25, 30 and 55, was investigated by use of the molecular dynamics method. The average distance $$(\bar r)$$ averaged over the positions of all Ar atoms with respect to the center of mass was calculated as a function of time and its frequency spectrum was derived by the Fourier transform analysis. The $$\bar r$$ value was proved to be a good index of the breathing vibration in comparison with the exact breathing vibration of an Ar dense sphere. The vibrational frequency thus estimated,f MD, was found to increase with the cluster sizen as expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543963
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    Paper (German National Licenses)
    Fulltext
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