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  • 1
    Electronic Resource
    Electronic Resource
    Argon predissociation and electron autodetachment spectroscopy of size-selected CH3NO2−⋅Arn clusters (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 10718-10723 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment spectra of CH3NO2−⋅Arn clusters in the mid-IR are dominated by three strong resonances. These are assigned to autodetaching (AD) C–H stretching vibrational transitions in the valence (as opposed to dipole-bound) form of the molecular anion on the basis of a H/D isotopic substitution study and their solvation dependence. The AD resonances disappear promptly upon addition of the third argon atom, while the resonant structure appears in the action spectrum for formation of CH3NO2− photoproducts for n≥2. The strong argon solvation dependence of the photoproducts is traced to the rapidly changing endoergicity of the electron loss channel due to the differential solvation behavior of the valence anion relative to the neutral. We discuss a statistical limit for this competition, and introduce an intramolecular vibrational energy redistribution mediated AD mechanism unique to polyatomic anions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1418251
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A pulsed supersonic entrainment reactor for the rational preparation of cold ionic complexes (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4431-4434 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe an ion source for the efficient preparation of cold ion-molecule complexes, X−⋅M. The method relies on condensation of solvent molecules, M, onto argon-solvated ions, X−⋅Arm, where the X−⋅Arm species are formed in a primary expansion and the molecular partner, M, is interfaced to this flow in the hydrodynamic region by supersonic entrainment. This hybrid "supersonic afterglow" reactor provides a clean synthetic approach for both bare and argon-solvated complexes, where the latter are particularly useful since their structures can be characterized by "nanomatrix" infrared predissociation spectroscopy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326931
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Modelling soil nitrogen levels under acacia/sorghum rotations (1994)
    Springer
    Agroforestry systems 27 (1994), S. 283-292 
    Details
    ISSN: 1572-9680
    Keywords: nitrogen-cycle model ; crop rotation ; Acacia senegal ; Sorghum bicolor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A mathematical model is formulated and implemented for the nitrogen (N) cycle, on a yearly time scale, in an arid-zone fallow system. The model is generally applicable to such systems; by combining data from a number of sources, its behaviour is investigated for a genericsorghum bicolor — Acacia senegal system. The model reproduces such observed effects as the initial fall in soil N early in theAcacia rotation, and provides support for the hypothesis that the N fixing potential ofAcacia roots is less important than their ability to take up otherwise inaccessible mineral N through deep roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00705062
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    Paper (German National Licenses)
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