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Influence of Laser Pulse Spatial Profile on Optodynamic Source Shape in Liquid Media

100%
Horvat D., Terzić M.
Acta Physica Polonica A
|
2007
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vol. 112
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issue 5
1151-1156
EN
The aim of the present study is to demonstrate the influence of the spatial nonhomogeneity of the laser beam intensity profile on laser induced breakdown in aqueous medium with the use of optodynamic methods. In the experiment the optodynamic waves were induced with pulsed Nd:YAG laser beam which had several"hot spots". The resulting optodynamic transient waves were detected with two detectors: a laser beam deflection probe inside the liquid, parallel to the liquid surface and a piezoelectric transducer at the bottom of the container. The results of the experiment indicate the existence of numerous smaller waves that are observed before the main signal in the optodynamic wave form, contrary to wave forms generated with a laser beam having a smooth spatial profile.
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Optical and Electron Spectrometry of Molecules of Biological Interest

52%
Marinković B., Milosavljević A., Maljković J., Šević D., Petruševski B., Pavlović D., Filipović D., Terzić M., Pejčev V.
Acta Physica Polonica A
|
2007
|
vol. 112
|
issue 5
1145-1150
EN
Optical absorption and emission spectroscopy together with low energy electron interaction (elastic scattering, excitation, ionization, resonances) with biologically relevant molecules (nitrogen, oxygen, water, alcohols, tetrahydrofuran, tetrahydrofurfuril alcohol, 3-hydroxytetrahydrofuran, pyrimidine, glycine, alanine) are studied in order to understand radiation damage and to investigate the presence of pollutants in the atmosphere. Versatile high resolution electron spectrometers are used in the present study of electron-molecule interactions. Energy loss spectra were recorded for these molecules in order to identify electronic transitions from ground state to both allowed and optically forbidden states. Optical emission spectra have been recorded from gas discharge processes by low resolution optical spectrometer (Ocean Optics 2000). Also, electronic spectra were compared with high resolution synchrotron photoabsorption spectra where these spectra had been available. Experimental methods of absorption-based laser spectroscopy were reviewed being of the most widely used analytical tools for detection of a specific molecule and quantitative measurements, based on the Beer-Lambert absorption law.
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