TY  - RPRT
A1  - Stawski, Theresa Paola
A1  - Lauth, Hans-Joachim
T1  - The Stateness Index (StIx) – Conceptual Design and Empirical Results
N2  - Exploring and explaining diversity and patterns of stateness is crucial for understanding causes of efficiency, duration, or the collapse of a state. The new Stateness Index (StIx) contributes to the conceptual and analytical debate on stateness and state fragility. StIx is a tool for measuring stateness and state quality since 1950 that includes country-ranking through aggregated and disaggregated data to advance performance comparison and policy analysis. This article first sums up the main theoretical aspects, followed by descriptive results.
T3  - Würzburger Arbeitspapiere zur Politikwissenschaft und Soziologie (WAPS) - 15 
KW  - Begrenzte Staatlichkeit
KW  - Staat
KW  - Messung
KW  - Index
KW  - Fragile Staaten
KW  - Staat
KW  - Messung
KW  - Index
KW  - Fragilität
KW  - State
KW  - Measurement
KW  - Index
KW  - Fragility
Y1  - 2024
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-347616
ER  - 
TY  - JOUR
A1  - Plötz, P.-A.
A1  - Polyutov, S. P.
A1  - Ivanov, S. D.
A1  - Fennel, F.
A1  - Wolter, S.
A1  - Niehaus, T.
A1  - Xie, Z.
A1  - Lochbrunner, S.
A1  - Würthner, Frank
A1  - Kühn, O.
T1  - Biphasic aggregation of a perylene bisimide dye identified by exciton-vibrational spectra
JF  - Physical Chemistry Chemical Physics
N2  - The quantum efficiency of light emission is a crucial parameter of supramolecular aggregates that can be tuned by the molecular design of the monomeric species. Here, we report on a strong variation of the fluorescence quantum yield due to different phases of aggregation for the case of a perylene bisimide dye. In particular, a change of the dominant aggregation character from H- to J-type within the first aggregation steps is found, explaining the observed dramatic change in quantum yield. This behaviour is rationalised by means of a systematic study of the intermolecular potential energy surfaces using the time-dependent density functional based tight-binding (TD-DFTB) method. This provides a correlation between structural changes and a coupling strength and supports the notion of H- type stacked dimers and J-type stack-slipped dimers. The exciton-vibrational level structure is modelled by means of an excitonic dimer model including two effective vibrational modes per monomer. Calculated absorption and fluorescence spectra are found to be in reasonable agreement with experimental ones, thus supporting the conclusion on the aggregation behaviour.
KW  - Potential-energy curves
KW  - Simulations
KW  - Molecular-dynamics
KW  - Systems
KW  - Fluorescence
KW  - Sracking
KW  - Pathway
KW  - Dimers
KW  - State
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-187387
VL  - 18
IS  - 36
ER  -