The D2O absorption spectra in SiO2 airgel pores: technical features of treatment

The dynamic of the D2О in silica airgel absorption spectra in 4000…6000 cm-1 were recorded using Fourier Transform spectrometer FS-125M at room temperature and pressure of 23.4 mbar with spectral resolution of 0.03 cm-1. It is shown that the D2O dimers to make a significant contribution into absorption when nanopores filled with gas molecules is small. Is present a detailed description of techniques for processing the primary experimental data

The D2O absorption spectra in SiO2 airgel pores: technical features of treatment

The dynamic of the D2О in silica airgel absorption spectra in 4000…6000 cm-1 were recorded using Fourier Transform spectrometer FS-125M at room temperature and pressure of 23.4 mbar with spectral resolution of 0.03 cm-1. It is shown that the D2O dimers to make a significant contribution into absorption when nanopores filled with gas molecules is small. Is present a detailed description of techniques for processing the primary experimental data

First-order phase transition in liquid water in terms of the mode structure of absorption spectrum in the near-IR range

Absorption spectra of liquid water H2O are investigated in the region 4500–5600 cm–1 at temperatures from –53.0 to +20.3°C. The absorption band is decomposed into component modes at (I) 4700, (II) 4890, (III) 5080, and (IV) 5200 cm–1 whose centers are shifted slightly with temperature. Modes (II), (III), and (IV) are present in the spectrum of liquid water, whereas modes (I), (II), and (III) are registered in the spectrum of ice. The appearance of the ordered crystalline lattice is characterized by the occurrence of low-frequency mode (I) and by the disappearance of high-frequency component (IV) of the water absorption band in the region 4500–5600 cm–1. The spectral regions and temperature ranges in which the structure is changed during phase transition are determined

First-order phase transition in liquid water in terms of the mode structure of absorption spectrum in the near-IR range

Absorption spectra of liquid water H2O are investigated in the region 4500–5600 cm–1 at temperatures from –53.0 to +20.3°C. The absorption band is decomposed into component modes at (I) 4700, (II) 4890, (III) 5080, and (IV) 5200 cm–1 whose centers are shifted slightly with temperature. Modes (II), (III), and (IV) are present in the spectrum of liquid water, whereas modes (I), (II), and (III) are registered in the spectrum of ice. The appearance of the ordered crystalline lattice is characterized by the occurrence of low-frequency mode (I) and by the disappearance of high-frequency component (IV) of the water absorption band in the region 4500–5600 cm–1. The spectral regions and temperature ranges in which the structure is changed during phase transition are determined

LED-based Fourier transform spectroscopy of 16O12C18O and 12C18O2 in the 11,260 - 11,430 cm-1 range

The absorption spectrum of the 16O12C18O and 12C18O2 carbon dioxide isotopologues has been recorded in the 11,260– 11,430 cm−1 spectral range using Bruker IFS 125 HR Fourier transform spectrometer with resolution 0.05 cm−1 at temperature 297 K and path length 24 m. The 18O enriched sample of carbon dioxide at total pressure 96.5 mbar was used for these purposes. The spectrometer used LED emitter as a light source. This gave possibility to reach the minimal detectable absorption coefficient αmin~1.4×10−7 cm−1 using 23,328 scans. In the recorded spectrum we have assigned the 00051–00001 band for both 16O12C18O and 12C18O2 isotopologues using the predictions performed within the framework of the method of effective operators. The line positions and intensities of the observed bands are found. The comparison of the observed and predicted line positions and intensities is performed confirming good accuracy of the predictions. The spectroscopic parameters for the observed bands are determined

LED-based Fourier transform spectroscopy of 16O12C18O and 12C18O2 in the 11,260 - 11,430 cm-1 range

The absorption spectrum of the 16O12C18O and 12C18O2 carbon dioxide isotopologues has been recorded in the 11,260– 11,430 cm−1 spectral range using Bruker IFS 125 HR Fourier transform spectrometer with resolution 0.05 cm−1 at temperature 297 K and path length 24 m. The 18O enriched sample of carbon dioxide at total pressure 96.5 mbar was used for these purposes. The spectrometer used LED emitter as a light source. This gave possibility to reach the minimal detectable absorption coefficient αmin~1.4×10−7 cm−1 using 23,328 scans. In the recorded spectrum we have assigned the 00051–00001 band for both 16O12C18O and 12C18O2 isotopologues using the predictions performed within the framework of the method of effective operators. The line positions and intensities of the observed bands are found. The comparison of the observed and predicted line positions and intensities is performed confirming good accuracy of the predictions. The spectroscopic parameters for the observed bands are determined