The Si-O-Si bond angle increased with increasing tensile stress, but the peak at ∼1200 cm−1 decreased with increasing tensile stress (even though volume expands with tensile stress). This anomalous feature was attributed to changing force constants by applied stress.; For fumed silica ...
红外光谱FTIR课件.ppt,吡嗪酰胺(抗结核病药) 丙二烯类 两个双键共用中间碳原子,耦合强烈,1600厘米-1无吸收,在2000-1915厘米-1和1100-1000厘米-1附近有不对称和对称伸缩振动,两峰相距900厘米-1,前者为中强峰,后者为弱峰。 芳香烃 振动类型 波数(cm-1) 说明 芳环C-H
An additional FTIR peak at 964 cm−1 occurs likely due to CrO vibrations, which is indication of formation of the metastable CrO3 [34], [35]. There is an ongoing debate regarding formation of CrO3 in welding fumes since they are formed at high temperature and CrO3 is not a stable co...
The spectrum (Figure 6(a)) at 873 K in the range 400–1000 cm−1 represents a poorly crystallized structure characterized by a broadband with no apparent thin peak. This signature is that of the γ-Al2O3 (the broad extending band in the range 400–700 cm−1 indicates the ...
Intricate ceramic bronze-casting moulds are among the most significant archaeological remains found at Bronze Age metallurgical workshops in China. Firing temperature was presumably one of the most important technical factors in mould making. However, it has proven difficult to determine the firing temper...
c Subsurface nano-FTIR phase spectra of PMMA at different depths d2 below PS (average of 50 spectra (80 spectra for d2 ≥ 85 nm), 30 s acquisition time per interferogram, ×128 zero filling, 17 cm−1 spectral resolution). Black arrows in c indicate the spectral peak shift...
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Measurement conditionSpectral resolution (FWHM): Wavenumber resolution (FWHM) equivalent to 25 cm-1 Signal‐to‐noise ratio: Ratio of the peak value of the spectrum data when light is incident to the root mean square (rms) of noise in the dark state ...
Using FTIR spectroscopy to relate the phase separation to molecular structure was also unsuccessful, since the variation observed (intensity change, peak broadening, peak shifting, and splitting) were small with respect to the overall magnitude of the spectra measured [3]. Accordingly, the recently ...
With low temperature (300℃) annealing, the FTIR absorption peak at the wave number of 829cm -1 (VO) disappeared of and four absorption peaks at the wave number of 825 cm -1 (V 2 O 2 )、833cm -1 (V 3 O 2 )、840cm -1 (V 2 O)and 919cm -1 (I 2 O 2 )appeared. When...