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Ruby Laser Interaction with Austenite Structural Materials

100%

Milosavljević A., Petronić S., Srećković M., Ristić S., Nešić I., Pljakić R., Negovanović V.

The investigations were carried out on chrome nickel steel and nickel based superalloy samples thermo-mechanically treated to obtain optimal mechanical properties and surface stability. Chrome nickel steel and a few nickel based superalloys samples were exposed to the laser beam before creep deformation process. The second group of nickel based superalloy samples were exposed after the creep deformation. The damages occurred by exposing of chrome nickel steel and nickel base superalloy samples to the ruby laser were analyzed by scanning electron microscope and energy-dispersive X-ray spectrometry. In this paper, the influence of laser dynamical regime (MW/mm^{2}) to the microstructural changes of heat treated chrome nickel steel and nickel based superalloy are analyzed and discussed.

Optical and Electron Spectrometry of Molecules of Biological Interest

84%

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

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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2 Acta Physica Polonica A

1 2009

1 2007

2 Milosavljević A.

1 Filipović D.

1 Maljković J.

1 Marinković B.

1 Negovanović V.

1 Nešić I.

1 Pavlović D.

1 Pejčev V.

1 Petronić S.

1 Petruševski B.

1 Pljakić R.

1 Ristić S.

1 Srećković M.

1 Terzić M.

1 Šević D.

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Ruby Laser Interaction with Austenite Structural Materials

Optical and Electron Spectrometry of Molecules of Biological Interest