Die Anwendung der Tonschwingungen zur Analyse von Gasgemengen

Analytical and Bioanalytical Chemistry -     

H-shaped oligothiophenes with low band gaps and amphoteric redox properties

H-shaped bridged oligothiophenes HT-1 and HT-2 were synthesized by two different approaches. Different from normal oligothiophenes, HT-1 and HT-2 showed low band gaps and amphoteric redox behaviors due to intramolecular charge transfer, which is further supported by time-dependent DFT calculations.     

Dissymetry of critical exponants in YBCO

We report on measurements of the specific heat of μg-size YBCO single crystals very close to the superconducting transition in zero field. Detailed data points are obtained down to reduced temperatures of 10^?5. Analysis of the derivative of the specific heat yields the critical exponents in an unambiguous way. α+ is positive ～0.5; α- is negative ～ ?0.3. The value of α+ is consistent with gaussian fluctuations above Tc, however the value of α- is inconsistent with either gaussian fluctuations or the 3DXY model.