Analyzer of liquid chemical substances

Článek popisuje pr incipy analýzy znečišťujících látek ve vodě poímocí molekulární absorpční spektrometrie, pro analýzu se využívá spektrometr. Součástí práce je i n ávrh a implementace softwaru pro vyhodnocování analýzy vody. S oftware je navržen o tak, aby bylo možné analýzu a získávání dat provádět velmi jednoduše. Pozornost analyze vody je zaměřena především na dusičnany. Detekce se zaměřuje na stanovení koncentrací jednotlivých složek, látka se rozpoznává s využiítím vhodného algoritmu .The article describes the principles of analysis of pollutants in water by molecular absorption spectrometry . The spectrometer is used for analysis. Design and implementation of software for the evaluation of water analysis is part of the work . The s oftware is designed with ease of use and retrieval of data. Analysis of water is mainly focused on nitrates. The detection is focused on determining levels of particular components, suitable algorithm recognizes the substance

Femtosecond fluorescence Anisotropy kinetics as a signature of ultrafast electronic energy transfer in bichromophoric molecules

Ultrafast time resolved fluorescence anisotropy decay measurements were performed to gain insight into the energy gap dependence of donor-acceptor inter-chromophoric coupling within one supra-molecule. Three new compounds, each consisting of two semi-rigidly linked and strongly coupled chromophores, were designed and synthesized for this study. Their general structure is donor-spacer-acceptor, where "donor" is phenylamino, pyrenylamino, or benzanthronylamino moiety, and acceptor is aminobenzanthrone. While being similar structurally, the compounds differ significantly in the excitation energy difference of the two chromophores in a supra-molecule. Experimental data show an ultrafast initial fluorescence emission anisotropy decrease (within less then I ps) when the excited state energies of the interacting chromophores are close to each other or equal. No such fast fluorescence anisotropy dynamics is observed for a compound with a large energy gap

Femtosecond fluorescence Anisotropy kinetics as a signature of ultrafast electronic energy transfer in bichromophoric molecules

Ultrafast time resolved fluorescence anisotropy decay measurements were performed to gain insight into the energy gap dependence of donor-acceptor inter-chromophoric coupling within one supra-molecule. Three new compounds, each consisting of two semi-rigidly linked and strongly coupled chromophores, were designed and synthesized for this study. Their general structure is donor-spacer-acceptor, where "donor" is phenylamino, pyrenylamino, or benzanthronylamino moiety, and acceptor is aminobenzanthrone. While being similar structurally, the compounds differ significantly in the excitation energy difference of the two chromophores in a supra-molecule. Experimental data show an ultrafast initial fluorescence emission anisotropy decrease (within less then I ps) when the excited state energies of the interacting chromophores are close to each other or equal. No such fast fluorescence anisotropy dynamics is observed for a compound with a large energy gap