N.N. Lavrentieva1,2, A.S. Dudaryonok1,2, J.V. Buldyreva3 1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia 2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia 3Institute UTINAM, UMR CNRS 6213, Université de Franche-Comté, 16 route de Gray, 25030 Besançon cedex, France
Keywords: line–broadening, symmetric top, methylcyanide, line–contour, intermolecular interactions
Subsection: SPECTROSCOPY OF AMBIENT MEDIUM
Calculated self- and nitrogen-broadening coefficients of methylcyanide lines are presented. The calculations are performed at the room temperature (Т = 296 K) for ~ 1 400 lines, rotational quantum numbers vary in ranges 0 ≤ J ≤ 70; 0 ≤ K ≤ 10. The temperature exponents for every value of broadening in the case of the Earth and Titan atmospheres temperature ranges are calculated. The calculations are made by a semi-empirical method, which is a modification of impact theory, based on the use of measured values of line contour parameters. A good agreement is obtained with experimental data.
V.A. Gladkikh, V.P. Mamyshev, S.L. Odintsov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: refractive index, surface air layer, structure parameter, diurnal behavior, ultrasonic anemometer-thermometer
Subsection: OPTICS OF STOCHASTICALLY-HETEROGENEOUS MEDIA
The paper analyzes the structure parameter of the refractive index of optical waves Cn2 in the surface air layer calculated from the structure parameter of the air temperature CT2. The Cn2 estimates obtained from data of an optical differential turbulence meter and ultrasonic anemometer-thermometers are compared. The systematic difference between these estimates at the high degree of correlation is noted. The diurnal mean profile of Cn2 in different seasons at territories with natural landscape and urban territory is obtained and analyzed.
Yu.E. Geints, A.A. Zemlyanov, E.K. Panina
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: photonic jet, method of computational electrodynamics, radially symmetric particles
Subsection: OPTICS OF CLUSTERS, AEROSOLS, AND HYDROSOLES
The results of numerical modeling of the light wave scattering near field (“photonic (nano)jet” — PNJ area) by radially symmetric nonabsorbing dielectric micron-sized particles are presented. It is shown that the homogeneous silica microparticles of different spatial shape and orientation form PNJ with different dimensions and amplitude parameters. Photonic nanojet from hemispheres possesses high extent but moderate intensity. Using of microaxicons provides for a record increase in the PNJ length of the order of twenty laser wavelength.
An optical model of the Earth's atmosphere for the integral characteristics of intense laser radiation in the near and mid-infrared wavelengths propagating along high-altitude slant paths is presented. A feature of the model is a combined accounting for the linear and nonlinear optical effects in the atmosphere.
B.G. Ageev1, Yu.N. Ponomarev1, E.N. Chesnokov2 1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia 2V.V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the RAS, 3 Institutskaya str., 3, 630090, Novosibirsk, Russia
Keywords: THz radiation, attenuation, water aerosol
Results of the energy attenuation measurements of terahertz radiation from the free-electron laser by a model air-aerosol medium are presented. The spectral and concentration dependencies of energy attenuation are investigated. It was show that the attenuation is caused by aerosol particulates for the implemented experimental conditions.
D.V. Beloplotov1,2, M.I. Lomaev1,2, V.F. Tarasenko1,2 1High Current Electronics Institute of the Siberian Branch of the RAS, 634055, Tomsk, 4, Academichesky ave. HCEI SB RAS 2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
Keywords: pulse–periodic discharge initiated of runaway electrons, blue and green mini jets in air, nitrogen and argon of average pressure
Performed spectroscopic and amplitude-temporal studies of jets in discharges initiated by runaway electrons have been studied. Pulse–periodic discharge was used. It is show that the color of the part of jets observed during laboratory discharges is determined by the radiation on transitions of vapour metal electrodes. It is found that blue mini jets from an electrode with a small radius of curvature appear in the cases of stainless steel and aluminum electrodes and are caused by radiation of atomic transitions of these metals. Green mini jets observed near copper electrodes are mainly caused by radiation of coper atomic transitions at wavelengths of 521.8 and 522 nm. It is confirmed that the jets of different colors appeare due to the bright spots on electrodes, as well as sparks in the discharge.
A.N. Iglakova1, V.K. Oshlakov1, L.V. Seleznev2, B.A. Tikhomirov1 1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia 2P.N. Lebedev Physical Institute of the Russian Academy of Science, 53 Leninskij Prospekt, 119991, Moscow, Russia
Keywords: terawatt femtosecond laser, measurement of the energy characteristics, photoacoustic receiver
To measure the energy of femtosecond laser pulses (248, 744, and 800 · 10–9 m), a photoacoustic receiver with a black body (as an absorbent element) and a condenser microphone (as a converter) placed in the enclosed volume with gas were tested. The device allows measurements of the energy of UV and IR laser pulses over a wide dynamic range (more than 80 dB with MK 221 microphone). The pulse repetition rate is up to 15 Hz, pulse duration, from 20 · 10–15 to 100 · 10–9 s, the threshold sensitivity, 10–9 J. High sensitivity of the receiver provides reliable measurements of energy of terawatt femtosecond laser pulses in the main absorption channel of radiation passing through the rotating mirror with a reflection coefficient close to 100%.
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V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: acetone, ethyl acetate, isoprene, Raman spectra cross sections of gases, remote diagnostics of gases, principal component analysis
Raman cross sections in the gas phase for isoprene, acetone, ethyl acetate were determined. The possibility of remote multiwavelength diagnostics of these gases was studied. For processing the results of the experiment, the principal component analysis was used.
K.Yu. Osipov1,2, V.A. Kapitanov1, Yu.N. Ponomarev1, A.I. Karapuzikov3 1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia 2National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia 3Institute of Laser Physics SB RAS, Ac. Lavrentyev's prosp., 13/3, Novosibirsk, 630090, Russia
Keywords: gas analysis, carbon isotope ratios, photoacoustic detector, absorbtion spectrum, Fabry–Perot interferometer
It is represented the scheme of work and numerical modeling of a photoacoustic gas analyzer with IR–source and 1–st order interference filter for carbon isotope ratios analysis. An optimal spectral range for gaz analyzer operation is selected. In the selected wavelength range, the spectral characteristics of the atmosphere and some additional gazes are analyzed, which could affect the measurement results. The proposed gas analyzer allows us to measure carbon isotope ratios 13С/12С in CO2 samples with a minimal error of about 0.5‰, and could be useful for detection of such gases as SO2, CO, NH3, absorption lines of which exist in the selected spectral range.
