Antibunching in the emission of a single tetrachromophoric dendritic system

The photophysics of a dendrimer containing four chromophores are investigated at the single-molecule level. First, the multichromophoric character of single dendrimers' absorption is probed by modulating the linear polarization of the excitation beam. Subsequently, using circular polarization, the same dendrimers are excited, and their fluorescence transients are recorded. Using pulsed excitation in combination with the classical Hanbury-Brown and Twiss coincidence setup the presented data demonstrate that efficient singlet-singlet annihilation ensures that always only one photon is emitted even when several excitations are generated in an individual multichromophoric molecule.     

Ein algorithmischer Zugang zu Polynomen und Splines

Zusammenfassung. Um polynomiale Kurven auf dem Computer modellieren zu k?nnen, verwendet man in der CAD-Praxis zumeist sogenannte Bézier-Kurven. Verallgemeinert man den zugeh?rigen Auswertungsalgorithmus, so kann man, auf ganz konstruktive Art auch Splinekurven definieren und ihre wesentlichen Eigenschaften auf sehr elementare Art und Weise herleiten. Der Zusammenhang wird dabei durch das sogenannte “Blossoming principle” hergestellt. Eingegangen am: 12.3.1996 / Angenommen am: 7.5.1996     

Beiträge zur Kenntnis des chromophoren Systems der Corrine. X. Über die Reaktion von Derivaten des Cobyrinsäure-heptamethylesters mit unterchloriger Säure

Contributions to the Knowledge of the Corrin Chromophore, X. Reaction of Derivatives of Cobyrinic Acid Heptamethyl Ester with Hypochlorous Acid (Cobalt)-dicyano-, chloro-cyano-, and dichloro-cobyrinic acid heptamethylesters ( 1, 2 and 3 ), respectively, as well as their 10-chloro derivatives 4, 5 and 6 react with hypochlorous acid. A report on the structure and some properties of the reaction products 8, 9 and 10 is given.     

A hydrodynamic model for profile steepening at resonance absorption

The self-consistent modification of an inhomogeneous plasma density profile near the critical layer due to the ponderomotive force of an obliquely incident p-polarized electromagnetic wave is calculated within a simple hydrodynamic plasma model.     

Off-energy-shell continuation of the two-nucleon transition matrix in the presence of tensor forces

For a coupled partial wave with a bound state, the entire T-matrix is determined by the bound-state energy and wave function, the on-shell mixing parameter and a real symmetric matrix function σ(k₂,₂ k₁₁) of the continuous momentum variables k and the discrete eigenchannel labels . The on-shell part of σ is given by the eigenphases, the arbitrariness of the T-matrix is the off-shell continuation of this phase-shift matrix σ(k₂, k₁) into two dimensions. Three possible techniques are suggested to go from to the entire T-matrix. This construction procedure for T avoids the usual complications of a potential fit.