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Atmospheric and Oceanic Optics

2015 year, number 5

1.
Investigations on high-resolution spectroscopy at V.E. Zuev Institute of Atmospheric Optics SB RAS

Yu.N. Ponomarev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: spectroscopy, atmosphere, molecule, absorption spectrum

Abstract >>
The 45-year period of development of the atmospheric spectroscopy at V.E. Zuev Institute of Atmospheric Optics SB RAN is reviewed.
																								



2.
Calculation of vibrational energy levels of symmetric molecules from potential energy surface

A.V. Nikitin
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: vibrational energy levels, potential energy surface, operator of kinetic energy, infrared spectra, variational methods

Abstract >>
The algorithm of energy level calculation for symmetric 4–6 atomic molecules was considered. The question of choice of coordinates, of the form of potential energy surface, and methods of solutions of Schrödinger equation were considered. The kinetic energy operator for molecules of AB4 type in internal mass-independent coordinates was built.
																								



3.
On the modeling of potential energy surfaces for molecular spectroscopy

R.V. Kochanov1,2, S.A. Tashkun3,2, Vl.G. Tyuterev4
1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, 02138-1516 Cambridge MA, USA
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
3V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
4Universite de Reims Champagne Ardenne, URCA, Moulin de la Housse BP 1039, 51687 REIMS cedex 2, France
Keywords: survey of potential energy surfaces, minimum energy path, modeling of high resolution molecular spectra, ab initio calculations of electronic structure, analytical modeling, splines

Abstract >>
In this review, we discuss the current status of construction and applications of potential energy surfaces (PES) for the problems of high resolution molecular spectroscopy. Examples are given for the usage of PES (basically for triatomic molecules) considering the experience of the authors. Several aspects of analytical and spline approaches of PES construction are considered. These aspects are aimed to ensure the physical correctness of a surface and usually being omitted in most of the papers.
																								



4.
Determination of parameters of spectral lines from several absorption spectra with the MultiSpectrum Fitting computer code

O.M. Lyulin1,2
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
Keywords: spectrum simulation, spectral line parameters, line position, intensity, broadening coefficient, pressure shift coefficient

Abstract >>
In the present work, the MSF computer code is presented intended for determination of the spectral line parameters by their simultaneous fitting to the several absorption spectra recorded under different conditions. Line positions, intensities, pressure broadening and shift coefficients, and lower state energies of dipole transitions in a molecule can be determinable parameters. Basic concept, algorithm, and capabilities of the MSF computer code are outlined in the paper.
																								



5.
Effects of strong vibrational excitation in water vapor spectroscopy

A.D. Bykov, N.N. Lavrentieva, L.N. Sinitsa
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: spectrometers, vibrational-rotational states, resonances, asymmetric top, potential surface, line broadening, line contour, intermolecular interactions

Abstract >>
High-sensitive spectrometers, created at IAO SB RAS for studying highly excited states, are described. The spectrometers include a Fourier spectrometer with a multipath absorption cell and spectrometers that use modern methods of highly sensitive laser spectroscopy (intracavity laser spectrometers, spectrometers with a high quality external cavity). Designed spectrometers have a high spectral resolution (0.01…0.001 cm-1) and high sensitivity to absorption (10-7 - 3 × 10-9 cm-1), which makes them promising for the study of parameters of spectral lines arising from transitions to high-energy vibrational-rotational states. The effects of the vibrational-rotational dynamics related to the chaotic behavior under strong excitation are considered by analyzing spectra of water vapor. They are: an anomalous centrifugal distortion, HEL-resonances in H2O, the 3 highly excited states of the HD16O, the vibrational dependence of the line contour parameters, and the effect of intramolecular resonances on interference lines.
																								



6.
Spectroscopic complex for investigation of selective and nonselective absorption spectra of gases in a wide spectral range

T.M. Petrova1, Yu.N. Ponomarev1, A.A. Solodov1, A.M. Solodov1, N.Yu. Boldyrev2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Institute for Spectroscopy RAS, Fizicheskaya Str., 5, Troitsk, Moscow, 142190, Russia
Keywords: Fourier spectroscopy, multipass gas cell, selective and nonselective absorption spectra

Abstract >>
This paper reports the design of the spectroscopic complex at IAO SB RAS for investigation of the absorption spectra in a wide spectral range (from 500 to 40000 cm-1) with a high sensitivity. The design of 30 m base length cell and the optical scheme are described, the comparison to the known analogous complexes is considered. The results of the study of selective and nonselsective absorption spectra, as well as spectra of gases confined in nanopores are presented.
																								



7.
Multipole electric moments and higher polarizabilities of molecules: The methodology and some results of ab initio calculations

Yu.N. Kalugina, V.N. Cherepanov
National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
Keywords: multipole moments, higher polarizabilities, ab initio calculations

Abstract >>
A technique for calculation of the electric multipole moments and higher molecular polarizabilities is described. The dipole, quadrupole, octupole, hexadecapole moments and the dipole, dipole-quadrupole, dipole-octupole, quadrupole-quadrupole polarizabilities of H2, O2, N2, CO2, CO, CN, HCl, HCN, NaCl, OH, N2H+, CH4, H2O molecules have been calculated using ab initio methods (R)CCSD(T) and CCSD(T) of high level with different aug-ccVXZ bases (X = Q, 5).
																								



8.
Water vapour continuum absorption: Short prehistory and current status

I.V. Ptashnik
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
piv@iao.ru
Keywords: H2O continuum, water dimers, bimolecular absorption, MT_CKD continuum model

Abstract >>
The weakly selective (continuum) absorption of electromagnetic radiation by water vapour is an important factor affecting the radiative balance of the Earth’s atmosphere, and is the main component of absorption in the IR atmospheric windows. The possible physical origin of this phenomenon is being discussed for more than 50 years. This paper gives a retrospective analysis and description of the current status in the problem of the water vapour continuum absorption. A brief description of the existing water vapour continuum models is presented including their advantages and shortcomings. The most interesting experimental and theoretical results of the recent years are discussed.
																								



9.
Spectral line shape and absorption in atmospheric windows

O.B. Rodimova
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: line wing theory, nonresonance absorption, intermolecular interaction potential, continuum absorption

Abstract >>
The basic concepts of the spectral line shape theory are outlined, which are essential for understanding the physical pattern of the absorption process at frequencies far from the line centers and characterize the theory as the independent part of spectroscopy. A relatively simple analytical expression for the line shape at large frequency detunings, including parameters of the classical and quantum intermolecular interaction potentials, gives a possibility to describe the spectral and temperature behavior of the absorption in band wings of different gases. It is shown that the general approach to the line shape problem underlying the asymptotical line wing theory enables the opportunity to represent the parameters, which were interpreted till now only from the viewpoint of the dimer hypothesis.
																								



10.
Algebraic approximation of the spectral line profile with accounting for strong and weak velocity-changing collisions

V.P. Kochanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: line profile, weak collisions, strong collisions, approximation

Abstract >>
The algebraic approximation of the spectral line profile derived with simultaneous account of small- and large-angle molecular scattering collisions was obtained. Deviations of the approximate line profile from the calculated exact profile do not exceed a tenth of a percent in the range of practically relevant parameters. It was shown that weak collisions with scattering on classical small angles diminish the collision line narrowing, which causes the profile to be flatter than the profile in the strong velocity-changing collisions model. The relative difference of the maximal amplitudes of these profiles can reach 15% that makes the accounting for weak collisions along with strong collisions to be necessary in a quantitative processing of high resolution inhomogeneously broadened spectra.
																								



11.
Spectroscopic information resources at Institute of Atmospheric Optics SB RAS

A.Yu. Akhlyostin, S.S. Voronina, N.A. Lavrentiev, A.Z. Fazliev
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: spectroscopy, information resources, Spectra, S&MPO, W@DIS, Hitran on the Web

Abstract >>
Information resources on spectroscopy are the most significant part of Institute of Atmospheric Optics SB RAS information resources. Furthermore, information systems Spectra, S&MPO, W@DIS, and HITRAN on the Web, developed via web-technologies, provide for a wide spectrum of researchers with access to verified data, information about this data, and knowledge, which allow processing this information on conceptual level. This article presents a brief description of these information systems. The focus of the work is on the information system W@DIS designed for qualitative analysis of spectroscopic data with different degrees of detailing.
																								



12.
Retrieval of content of greenhouse gases from atmospheric spectra of solar radiation with the use of different spectroscopic data on absorption lines

T.Yu. Chesnokova1, A.V. Chentsov1, N.V. Rokotyan2, V.I. Zakharov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Ural Federal University named after the first President of Russia B.N. Yeltsin, 620083, 51 Lenina, Ekaterinburg, Russia
Keywords: atmospheric transmission, spectroscopic databanks, carbon dioxide, methane

Abstract >>
A comparison of atmospheric solar spectra, calculated with different data on the atmospheric gas absorption lines, with the spectra measured by a ground-based Fourier-spectrometer with a high spectral resolution is made. The carbon dioxide and methane total contents in the atmospheric column are retrieved from the measured spectra with the use of modern spectroscopic databases in a direct model. It is shown that the values of the atmospheric methane content retrieved with the use of the recent versions of the HITRAN spectroscopic database differ almost by 2%; for the carbon dioxide, the lesser difference is observed.
																								



13.
Information