Water vapor line shifts in the range 5000–5600 cm<Superscript>−1</Superscript> induced by the pressure of different buffer gases

The coefficients of the water vapor line shifts induced by the pressure of oxygen, nitrogen, and argon are measured and calculated in the spectral range from 5000 to 5600 cm^?1. The experimental data are obtained from the analysis of the absorption spectra of H₂O-O₂, H₂O-N₂, and H₂O-Ar mixtures measured on a Fourier spectrometer with a resolution of 0.007 cm^?1 in a wide pressure range of buffer gases at room temperature for an optical path length of 84.05 m. The calculations are performed according to the Anderson impact theory of broadening with the use of only one adjustable parameter—the effective mean dipole polarizability of the upper vibrational state. The shifts of one and the same lines induced by the pressure of different buffer gases are compared; the role played by different terms of the intermolecular potential in the formation of the shifts is analyzed.     

Dynamic registration of D2 16O absorption spectrum in silica aerogel

Absorption spectra of the gas phase and adsorbed D₂О in the silica aerogel with nanoscale pores were investigated in 3700–5400 cm^?1 range using dynamic registration with Fourier Transform spectrometer IFS-125M. Two types of sample with pores of 60 nm wide – the nitrogen gas-treated and untreated aerogels – were examined. The surface treatment of the sample changes noticeably the broadband absorption of adsorbed water. Spectrum of D₂O in the pores differs from the spectrum of bulk water as for bandwidth so for band maximum. It was found that treatment of the pores by dry nitrogen leads to increasing hydrophilic properties of the material and to change water band contour. The D₂О line widths in both the aerogels exceed those of free monomer in 1.1–3 times at the same pressure. Calculations of self-broadening coefficients of the D₂O lines were performed using semi-empirical method based on the impact theory of broadening and includes the correction factors. The calculated results well agree with experimental data. Greater differences were found for the shift of the line centre. The D₂O line shifts in the treated pores significantly exceed line shifts in the untreated pores. For some lines, these shifts have the opposite sign indicating complex nature of the molecule–wall interaction.     

Defects in the GaAs and InGaAs layers grown by low-temperature molecular-beam epitaxy

The problem of defect formation in the GaAs and InGaAs layers grown by low-temperature molecular-beam epitaxy is discussed. The effect of growth conditions (temperature and flux ratio between the elements of groups III and V) on the morphology of growth surface, internal structure, type, and concentration of electrically-and optically active defects is analyzed. A comparison is made between the defect formation processes occuring during the epitaxial growth and post-growth annealing of the layers. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 63–72, December, 2006.     

Measurements of N2-broadening and -shifting parameters of the water vapor spectral lines in the second hexad region

The water vapor line broadening and shifting in the ν₁+ν₂+ν₃ band induced by nitrogen pressure are measured with Bruker IFS 125 HR FTIR spectrometer at the spectral resolution of 0.01 cm⁻¹ for the line with upper states angular momentum up to 11. Line contour parameters are calculated using a semi-empirical approach extended by the use of empirical data to determine some fitting model parameters. We use the complete set of high accuracy vibration-rotation dipole transition moments calculated for all possible transitions using wavefunctions determined from variational nuclear motion calculations and an ab initio dipole moment surface. Calculated values of line contour parameters are in a good agreement with observed parameters.     

Collisional broadening of CO<Subscript>2</Subscript> 10<Superscript>0</Superscript>0–00<Superscript>0</Superscript>1 transition absorption lines by N<Subscript>2</Subscript>O molecules

Relative coefficients of collisional broadening caused by N₂O molecules and their temperature dependences are determined for absorption lines (10⁰0–00⁰1 transition, R-branch) of the CO₂ molecule.     

Liquid phase oxidation of transition metals. Part 6. iron and copper complexes containing dimethylsulphoxide,dimethylformamide, and acetonitrile. Anomalous states of ligands

Summary Direct oxidation of iron and copper in a donor-acceptor medium, L + CCl₄, where L is dimethylsulphoxide, dimethylformamide or acetonitrile was employed to obtain complex compounds:cis-[FeCl₂(DMSO)₄]Cl] (3), 2 FeCl₃ · 3 DMSO (5), [FeCl(DMSO)₅][FeCl₄]₂] (6), [FeCl(DMSO)₅][Fe₂Cl₆O] (7),cis-[FeCl₂(DMF)₄][FeCl₄] (8), [Fe(MeCN)₆][FeCl₄]₂ (9) andcis-[CuCl₂(DMF)₂]₂ (10), The structures of complexes (9) and (10) have been established by x-ray diffraction analysis and compared with those of (3), (6), (7) and (8) which are reported elsewhere.The [FeCl(DMSO)₅][Fe₂Cl₆O] complex (7) is formed by oxidation of iron fromcis-[Fe^IIICl₂(DMSO)₄]₂[Fe^IICl₄] (4) in ethanol. One of the 5 DMSO molecules of (7) was found to be disordered; the Mössbauer spectroscopy data suggest that it can move within the cation coordination sphere.Mössbauer spectroscopy and x-ray diffraction analysis indicate electron isomerism in one of the complexes.For papers 4 and 5 of these series see refs. 1 and 2.     

Self-Broadening and Carbon-Dioxide Broadening of Lines of the H<Subscript>2</Subscript>S Molecule

Carbon-dioxide-broadening coefficients and self-broadening coefficients of lines of the main isotopic modification of Н₂S are estimated on the basis of literature data. The J′-dependences of the above line-profile parameters of the hydrogen-sulfide molecule are examined. In the case of CO₂ broadening, the half-widths of lines are calculated by a semiempirical method based on a parametric modification of the impact semiclassical model; the model parameters were determined from the fit to experimental data.