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  • 1985-1989  (3)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Mechanism of electron attachment to van der Waals clusters: Application to carbon dioxide clusters (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3927-3933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theory on the attachment of very slow electrons to van der Waals clusters was developed on the basis of the electronic structure theory, and was applied to clarify the mechanism of the collisional electron transfer from a high-Rydberg atom to a CO2 cluster. The strong coupled electron–phonon model is found to afford a reasonable mechanism of the attachment. The equilibrium geometry of (CO2)N (2≤N≤13) clusters are determined and their vertical affinity levels are obtained by the DV-X α-transition state method. Using this information, as well as some plausible assumptions on the values of the coupling constants, the attachment cross section σ is evaluated as a function of the energy of the incident electron. The theory predicts the existence of the threshold cluster size for the attachment and a sharp decrease of σ with the energy, which are consistent with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452946
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Silica polymorphs (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 193-193 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-In the contents panel of Nature of 18 May 1989, an explanation of a paper1 on zeolite is accompanied by a figure that is, in fact, taken from our paper2 in the same issue on new crystal structures of silica (SiO2). Curiously, this inadvertent association reminds us of a notion that has been at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340193b0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    New pressure-induced structural transformations in silica obtained by computer simulation (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 209-211 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The functional form of the interatomic potentials is expressed as1 x exp [(a, + dj - r)/(bt + bj)] - CtJ/r6 where r is the distance between the ith and the 7"th atoms, /o= 1 kcal A"1 mol"1, and the potential parameters used here are Q0 = -l.2 and Qsi = +2.4 in units of elementary charge, a0 = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339209a0
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    Paper (German National Licenses)
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