As in F-doped fused silica, the sharp, very intense and strongly polarized Raman peak at 490 cm −1, in silica gel, which we label D 0, is interpreted as the symmetric stretch oxygen vibration of three network oxygen atoms connected to a silicon atom which has become decoupled from the...
The origin of the "defect" 490 cm1 Raman peak in silica gel The structure of wet SiO 2 gel before any drying was studied by means of Raman spectroscopy. The vibrational structure of the gel network in water at room temperature already resembles that of bulk vitreous silica. Typical bands fo...
It is shown by Raman spectroscopy that high-temperature hydrogen-impregnated vitreous silica contains, in addition to physically dissolved hydrogen, ≡SiOH and ≡SiH groups. A Raman-scattering peak with a wave-number shift of 3685 cm 1 is assigned to the OH stretching vibration, a peak with a...
Acoustic Nature of the Boson Peak in Vitreous Silicadoi:10.1080/13642819908223089New temperature-dependent inelastic X-ray scattering (IXS) and Raman scattering (RS) data are compared with each other and with existing inelastic neutron scattering (INS) data in vitreous silica, in the 300-1775 K ...
Since the Raman spectrum is composed of spectroscopic lines that are not as broad as fluorescence spectra, it is one of the most investigated techniques in chemical analysis (Petry et al., 2003). Surface-enhanced Raman scattering could provide a specific labeling probe when dyes such as Texas ...
www.nature.com/scientificreports OPEN Surface-Enhanced Raman Scattering of Silicon Nanocrystals in a Silica Film received: 03 February 2016 accepted: 11 May 2016 Published: 03 June 2016 Sergei Novikov1 & Leonid Khriachtchev2 Surface-enhanced Raman scattering (SERS) is an intriguing effect, ...
We report the observation of spontaneous and stimulated Raman scattering in a silica-cladded silicon photonic crystal (PhC) waveguide (WG) with modified holes. Spontaneous Raman scattering in the WG was enhanced when the Stokes wavelength was approached to the bandedge of a WG mode. A maximum en...
For α-cristobalite, a strong new peak appeared at 620 cm-1, and the adsorption at 800 cm-1 increased considerably. α-cristobalite also has two adsorption peaks in far-infrared. 展开 关键词: Amorphous silica α-cristobalite IR and Raman spectroscopy ...
Characteristic Raman peaks for thiram occur at positions such as 1141 and 1506 cm−1 due to the CN stretching mode (ν(CN)) and CH3 shaking mode (ρ(CH3)) [57]. For carbaryl, the main peak occurs at 520 cm−1 due to low frequency C–C bending modes; 1377 cm−1 due ...
Fluorescein can exist in solution either in dianionic (Fl2−) or monoanionic (Fl−) form depending on the pH solution; peak position and assignment in the range 1100–1600 cm−1 from literature data53 for Fl− and Fl2− is shown in Table 1. In the spectrum of pristine ...