A new models of Xe2-excilamp (with maximum of radiation spectra at 172 nm) developed in Optical Radiation Laboratory of High Current Electronics Institute are presented. The task of creating a lamp with the most simple design embodiment was solved. The bulb of such an excilamp was made from a single quartz tube with a diameter of 22 mm and a length of 12 cm. The length of the discharge region was 4 cm. The lamp was supplied with voltage pulses from a generator of 2 μs with a repetition frequency up to 100 kHz. A radiant exitance of 3.5 mW/cm2 has been obtained. This value has not changed after 2400 hours of excilamp operation. The report will also describe other designs of Xe2-excilamps.
The cathodoluminescence spectra of nine diamond samples at temperatures of 82-295 K were investigated. According to the presence of the N3a vibronic system with the zero-phonon line at 2.68 eV in the luminescence spectra, six samples were identified as natural. By the presence in the luminescence spectra of the 2.56-eV vibronic system and the unstructured band at 2.54 eV, associated with nickel, two samples were identified as synthetic, grown at high pressure and high temperature. Due to exciton luminescence at 5.271 eV and the absence of any spectral features of impurity nature, one sample was identified as synthetic, grown by the chemical vapor deposition. Based on the data obtained, the technique for identifying of natural and synthetic diamonds has been proposed.
The inactivation of eggs of Opisthorchis felineus and Diphyllobothrium latum in the water under the action of UV excilamps at 222 and 282 nm in dependence on the surface dose of radiation was studied. It was observed that the water disinfection from eggs of helminthes was more efficient at 222 nm, than at 282 nm. At the surface dose up to 5 mJ/cm2 of UV radiation at 222 nm up to 85 % of Opisthorchis felineus eggs were inactivated. At the comparable surface dose of UV radiation at 222 nm up to 56 % of Diphyllobothrium latum eggs were inactivated.
Photoluminescence and optical transmission spectra of several samples of natural and synthetic diamond and its
imitators - fianite and corundum - are investigated. The band-A of luminescence at 440 nm, the vibronic N3 system of
luminescence and absorption at 415.2 nm, the fundamental absorption edge at 225 nm, and the secondary absorption
below 308 nm are the main identifying markers of natural diamonds. For synthetic diamonds, however, such identifying
markers are the exciton luminescence at 235 nm, the band-A, and the fundamental absorption edge. Fianites can be
identified by the structureless wide band at 500 nm and the wide transmission band in the entire visible range. Colored
corundum samples with chrome impurities emit the narrow line at 693 nm and show the absorption band in the 500-600
nm spectral range. A new method for diamond express identification is developed on the basis of measurement of
photoluminescence and optical transmission spectra of the samples. It is shown that a diamond tester can be designed
combining a spectrometer and a KrCl-excilamp radiating at 222 nm.
Transmission and luminescence spectra of natural or/and synthetic samples of corundum, diamonds and phianites are
obtained by irradiation of a KrCl-excilamp (222 nm) driven by the barrier discharge. It is offered to use a KrCl-excilamp
for development of devices for nondestructive identification of diamonds and their imitations.
The study of features of XeBr-excilamp (282 nm) and low-pressure Hg-lamp (253.7 nm) radiation impact on Escherichia coli bacterial culture are presented. It is shown for the first time that both sources of radiation have comparable germicidal action. The prospects of a new bactericidal radiation source - XeBr-excilamp - are discussed.
Experimental results on peculiarities of bactericidal effect of atmospheric plasma components and narrowband ultraviolet (UV) radiation of barner discharge XeBr- and KrBr-excilamps on the cultures Escherichia coli and Staphylococcus aureus are presented. Combination of such plasma components as UV radiation at 190 < λ < 220 nm and electroneutral particles is shown to possess the best sterilizing action. A KrBr-excilamp is shown to possess the unique spectrum, which corresponds to maximum of DNA inactivation section of microorganisms.
The possibility of use of nonlinear ring interferometer (NRI) for protect of information was shown by the authors earlier. How does the mismatch of the principal physical factors influence error of deciphering in model of cryptosystme based on NRI? It appears that this error can be submitted as a wave process. The anlysistical expressions of amplitude and phase of this process are obtained. These expressions do not contradict results of author's simulations. A possibility of delay time cracking by means of correlation analysis and number of keys of stipulated by nonlinearity parameter variations is discussed.
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