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  • 1
    Electronic Resource
    Electronic Resource
    Branchings in rooted graphs and the diameter of greedoids (1988)
    Springer
    Combinatorica 8 (1988), S. 217-234 
    Details
    ISSN: 1439-6912
    Keywords: 05 B 35 ; 05 c 20 ; 68 Q 20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract LetG be a 2-connected rooted graph of rankr andA, B two (rooted) spanning trees ofG We show that the maximum number of exchanges of leaves that can be required to transformA intoB isr 2−r+1 (r〉0). This answers a question by L. Lovász. There is a natural reformulation of this problem in the theory ofgreedoids, which asks for the maximum diameter of the basis graph of a 2-connected branching greedcid of rankr. Greedoids are finite accessible set systems satisfying the matroid exchange axiom. Their theory provides both language and conceptual framework for the proof. However, it is shown that for general 2-connected greedoids (not necessarily constructed from branchings in rooted graphs) the maximum diameter is 2r−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02122803
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Rotational excitation by electron impact: a state selective study using laser-induced fluorescence (1990)
    Springer
    The European physical journal 16 (1990), S. 207-217 
    Details
    ISSN: 1434-6079
    Keywords: 34.80.Gs ; 34.50.Ez ; 34.50.Pi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angularly resolved pure rotational excitation of sodium dimers by intermediate energy electrons (150 to 300 eV) is studied using laser state selection technique, under nonresonant collision conditions. The experimental procedure, which is new to electron scattering, is described in detail. The experimental data show large rotational transitions and rotational rainbow structures. The relative cross sections agree well with the close coupling calculations and also with the spectator model predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437334
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of vibrational bond stretching on rotational inelastic electron-molecule scattering (1988)
    Springer
    The European physical journal 10 (1988), S. 247-252 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.Ez ; 34.50.Pi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Differential cross sections for state-to-state rotationally inelastic electron-Na2 scattering, with the molecule being in the vibrational levelv′'=31, are measured at a collision energy of 150 eV. Angular momentum transfer of up to Δj=26 is observed, which is even more than previously obtained for the vibrational ground statev′'=0. Good agreement is found with theoretical results from a spectator scattering model. This work, in general, elucidates the role of vibrational excitation in collision dynamics under vibrationally sudden conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384859
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    Paper (German National Licenses)
    Fulltext
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