Introduction: Silicon carbide is a particularly interesting phase because more than a hundred different polytypes can be formed in the laboratory. The formation of these polytypes depends strongly on growth conditions (e.g., temperature, pressure). Daulton et al. [1] used TEM to study the microstructures of ~500 presolar SiC grains in an acid residue of the Murchison meteorite (KJB fraction of ...

A sensitive confocal Raman microspectrometer was employed to record spectra of nuclei and cytoplasmic regions of single living human granulocytes. Conditions were used that ensured cell viability and reproducibility of the spectra. Identical spectra were obtained from the nuclei of neutrophilic, eosinophilic, and basophilic granulocytes, which yield information about DNA and protein secondary s...

Blood tests, which are commonly used for cancer screening, generally have low sensitivity. Here, we developed a novel rapid and simple method to generate silver nanoscale hexagonal columns (NHCs) for use in surface-enhanced Raman scattering (SERS). We reported that the intensity of SERS spectra of clinical serum samples obtained from gastrointestinal cancer patients is was significantly higher ...

Surface- and tip-enhanced Raman spectroscopy (SERS and TERS) are modern spectroscopic techniques, which are becoming widely used and show a great potential for the structural characterisation of biological systems. Strong enhancement of the Raman signal through localised surface plasmon resonance enables chemical detection at the single-molecule scale. Enhanced Raman spectra collected from biol...

The FT-IR, FT-Raman and SERS Spectra of 1-Chloro 4-Flurobenzene (C6H4CLF) have been recorded in the range 4000-400cm -1 , the optimized geometry,frequency and intensity of the vibrtional bands of C6H4CLFhave been obtained by DFT levels of theory with complete relaxation in the 6-311**G basis sets. A complete vibrational assignment, aided by the theoretical frequency analysis, has been proposed....

Overview: Detection of water and carbon is important in order to support existence of life on other planets. Water has been detected on Mars and Moon in the form of ice and in hydrous minerals. Among the various techniques to detect water, ice, and H 2 O/OH bearing minerals, Raman spectroscopy stands out as providing distinctive spectra for unambiguous identification of water and water bearing ...

Near-infrared (NIR) Raman spectroscopy was used to measure spectra of dried human blood samples from multiple donors. Two major questions addressed in this paper involve the influence of sample heterogeneity and potential Raman spectral variations that could arise between different donors of blood. Advanced statistical analysis of spectra obtained from multiple spots on dry samples showed that ...

The powder X-ray diffraction patterns, Raman spectra, magnetization, electron spin resonance (ESR), and resistivity for Pr0.5Ca0.4Sr0.1MnO3 were studied. The Raman spectra change dramatically during the charge ordering transition, and the hardening of the 450 cm mode of the spectra is due to the unit cell reduction of the antiferromagnetic phase. The two resonance signals in the first different...

The infrared (IR) and Raman spectra of triphenylene with intensities were calculated using both density functional theory (DFT, B3LYP method) and Moller-Plesset perturbation method of second order (MP2) with ccpVDZ basis set. Spectra were compared with experimentally measured; the agreement between the observed and calculated spectra is good in case of IR spectroscopy, MP2 simulated spectra wer...

The mineral harmotome (Ba,Na,K)1-2(Si,Al)8O16⋅6H2O is a crystalline sodium calcium silicate which has the potential to be used in plaster boards and other industrial applications. It is a natural zeolite with catalytic potential. Raman bands at 1020 and 1102 cm(-1) are assigned to the SiO stretching vibrations of three dimensional siloxane units. Raman bands at 428, 470 and 491 cm(-1) are assig...