The first overtone and the second overtone bands of pure CO as well as the first overtone band of CO in solution in the gaseous, liquid, and solid states of N2 and Ar have been studied. The method for obtaining under pressure long lengths of transparent solids is described. A principal band due to C12O16 and a weak satellite due to the isotopes C13O16 and C12O18 have been found, and displacement of the maximum of the principal band and this satellite have been measured. The results are compared with those found for the fundamental by the condensed matrix method. The form of the band, in particular, its half-width, as a function of temperature and density is discussed.
Glasses in the composition range in mol% 35-50 ZnO – 10-15 Al2O3 – 40-55 SiO2 were
prepared, undoped and doped with 1 x 1019 and 1 x 1020 Sm3+ per cm3 glass as luminescent species
for the visible region, especially for blue and red emission.
Phase separation occurs in glass samples with high SiO2 content. SiO2-rich droplets in a Zn2+- Al3+-
enriched matrix were formed. Sm3+ ions prefer the Zn2+-Al3+-rich glass matrix.
By thermal treatment glass samples were transformed into glass ceramics with the main crystal
phases: Zn2SiO4 (willemite), ZnAl2O4 (gahnite) and SiO2-mixed crystals. XRD, SEM and TEM
measurements were carried out. The luminescent Sm3+ ions are concentrated in the glass matrix.
Photoluminescence excitation and emission spectra were recorded in the UV-VIS-region and the
time resolved emission behavior was measured by excitation with a N2-laser at 337 nm.
The glasses and glass ceramics have interesting chemical and physical properties, high Tg around
700°C, low coefficient of thermal expansion ~ 4 ppm/K, and high chemical stability.
Theory of phase transitions in solid methanes. XI. Infrared and Raman spectra of the ν3 and ν4 modes in phase II of solid CH4 Raman spectra of the intramolecular vibrations in solid CH. have been observed at 4.2 K under pressure.The observed VIv) vibration-rotation band structures in phase II agree well with previous experimental and theoretical data. The v. band was detected in both phases II and III. A remarkable change of each spectrum was found at 0.4 kbar, indicating the II-III phase transition. The rotational states of methanes in phase III have been deduced from the observed data. It is concluded that in phase III there are at least three kinds of sites with different site symmetries.
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