Browsing by Author "Schmidt, Harry"

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    Novel properties of new phosphatranes and silatranes
    (1989) Gudat, Dietrich; Lensink, Cornelis; Schmidt, Harry; Xi, S.-K.; Verkade, John G.
    The synthesis of the new pro-phosphatranes YP(MeNCH2CH2)3N (Y = lone pair, 0, S, Se, BH3 and CH3+) containing four-coordinate phosphorus, and the tbp phosphatranes YP(MeNCH2CH2)3N (Y = H+, BrCH2 and Cl+) are reported. New azasilatranes of the type YSiRNCH2CH2)3N (R = H, Me, SiMe3; Y = H, OMe, OEt) are also reported and the results of nucleophilic substitution studies of the labile hydrogen on the equatorial nitrogens are given.
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    Thermal and nonthermal properties of closed bipartite quantum systems
    (2007) Schmidt, Harry; Mahler, Günter (Prof. Dr.)
    We investigate a two-level system in contact with a larger quantum environment, often consisting of many two-level systems itself (spin environment) which may or may not interact. The total system is considered to be closed. The environment typically is in a canonical state with a given temperature initially. Depending on the precise spectral structure of the environment and the type of coupling between both systems, the smaller part may relax to a canonical state with the same temperature as the environment (i.e., thermal relaxation) or to some other quasiequilibrium state (nonthermal relaxation). The type of (quasi)equilibrium state can be related to the distribution of certain properties of the energy eigenvectors of the total system. We examine these distributions for several abstract and concrete (spin environment) Hamiltonian systems; the significant aspect of these distributions can be related to the relative strength of the local and interaction parts of the Hamiltonian.