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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Solvent Influence on Photochemistry of Small Biomolecules in Clusters
 Profant, V. ; Dian, J. ; Fárník, Michal ; Poterya, Viktoriya
We present a photolysis study of pyrrole, imidazole and pyrazole clusters in comparison to the photolysis of the isolated molecules. Size distributions of different mean cluster sizes have been prepared and characterized in supersonic expansions. The clusters were photolyzed at 243 and 193 nm and the kinetic energy distributions (KEDs) of the H-fragments were measured. The KEDs of all systems exhibit a bimodal character with slow and fast H-fragment peaks similar to the spectra of the corresponding single molecules. However, with the increasing clusters size the slow component gains on intensity in comparison to the fast component. A similar effect is observed with increasing the excitation energy from 243 to 193 nm.
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How changed physical chemistry into nanotechnology and nanotechnology into physical chemistry?
 Ončák, Milan ; Slavíček, P.
Our subject matter of the work is: How changed physical chemistry into nanotechnology and nanotechnology into physical chemistry.
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Nanoparticles in molecular and laser beams
 Fárník, Michal
The subject matter about this work is: From engeneering chemistry to nanotechnology.
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Fotochemie v klastrech a nanočásticích: systémy relevantní v atmosférické chemii a v biologii
 Fárník, Michal
Influence of solvation on photodissociation of molecules is investigated in clusters produced in a molecular beam experiment. Photochemistry in three different systems is compared: (i) HBrArn and (HBr)n clusters, where the fragment does not react with the solvent and an effect of the fragment caging is observed, (ii) HBr(H2O)n system where chemical reaction occurs and a reaction channel is closed by the electronic interaction with the solvent. The practical relevance of the studied processes ranges from atmospheric chemistry to biology.
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