In most cases, a chemical species will have strong, indicative bands in both its Raman and IR spectra but they may not coincide. Which technique is superior depends upon the molecule of interest, the concentration level, the matrix or solution, other interfering species present, and the desired...
Raman is a light scattering technique, whereby a molecule scatters incident light from a high intensity laser light source. Most of the scattered light is at the same wavelength (or color) as the laser source and does not provide useful information – this is called Rayleigh Scatter...
X-ray spectracross-sectionchemical effectProposed single molecule surface-enhanced Raman scattering (SM-SERS) mechanisms are discussed and problems in SM-SERS of biological molecules are pointed out. It is unlikely that the single molecule signals can be explained exclusively by electromagnetic (EM) '...
Raman intensity interpretation is made more challenging by variations in sample focus during imaging since it is difficult to distinguish between changes in intensities brought on by variations in sample focus and those produced by changes in the sample itself. The quality of the Raman spectra and ...
If no reference spectra are available, you can create Raman images using unsupervised chemometric methods. These include cluster analysis, principal component analysis (PCA), or Renishaw's EmptyModelling™ software feature. We can use these chemometric methods without knowing what is in the sample....
Raman Spectroscopy measures scattered light, which may have lost or gained energy due to transitions between vibrational levels in the molecule. The resulting spectrum is incredibly specific to the chemical composition, molecular environment, and temperature of the sample. Some applications of Raman ...
Raman spectra of these tubes are quite interesting because of resonance phenomena and sensitivity to tube structure. That is, there is very strong excitation wavelength dependence of the spectra resulting from the electronic band structure. And features in the Raman spectra are diagnostic of the CNT...
Raman Spectroscopy measures scattered light, which may have lost or gained energy due to transitions between vibrational levels in the molecule. The resulting spectrum is incredibly specific to the chemical composition, molecular environment, and temperature of the sample. Some applications of Raman ...
weddellite (calcium oxalate dihydrate or COD, CaC2O4·(2 + x)H2O), is induced by hypercalciuria. For such kidney stones, subtypes, IIa, IIb and IIc, also exist. Crystalline conversion from weddellite to whewellite introduces a contradiction between Fourier transform infrared (FTIR) spectra ...
Spectroscopy is the name used to describe the study of spectra produced by matter that interacts with or emits electromagnetic radiation, with spectra is measured as a function of radiation frequency or wavelength. Electromagnetic radiation is directed towards a sample, which then absorbs energy from...