Polarized Raman spectroscopy was used to measure the crystal orientation of a gem-quality diamond single crystal. The theoretical background and the instrumentation necessary to measure polarized Raman spectra are presented. The depolarization produced by microscope objectives used for micro-Raman ...
The method is based on a universal and strong polarisation anisotropy of the Raman scattering by doubly degenerate optic phonon modes and it only requires a standard Raman microscope equipped with a polarisation analysis. Explicit formulas for the orientation of the crystal grain are derived. The ...
Using a deep ultraviolet (DUV) laser, SHERLOC obtains native fluorescence emissions from aromatic organic species and Raman scattered photons from molecules that allow identification of functional groups of organics, chemicals, and minerals. SHERLOC also acquires high spatial resolution color and gray ...
5,9,30. In the lattice of ZrSiTe, double layers of Zr–Te are separated by a layer of a Si square net. Two adjacent Te layers (Fig.1b) are expected to be separated upon a cleavage along the (001)-orientation. Compared to its analogues, ZrSiS and ZrSiSe, the interlayer...
Comparison of the Raman spectra with results of single-crystal X-ray diffraction and with data from polynucleotides permits the identification of a number of Raman frequencies diagnostic of the A-helix structure for GC sequences. The guanine ring frequency characteristic of C3'-endo pucker and ...
Furthermore, spectral sampling volumes can be critical for accurate identification of early disease in certain conditions such as dysplasia, when probing for early disease close to the surface of an organ [26,27]. Further miniaturisation can allow measurement of Raman signals through needles (see ...
Using the principles of the theory of distortion-induced activity of forbidden modes of molecular units in crystals, a quantitative theory of distortion-induced activity of forbidden Raman modes of molecular units in different crystal orientations is discussed. An example of the observation of nu 1s...
of light by matter (i.e.the energy of the scattered photon is not equal to that of the incident photon) is known as theRaman effect[1,4,6]. This inelastic process leaves the molecule in a modified (ro-)vibrational state. In the case of a crystal lattice, the energy transfer creates...
Thus, Raman spectroscopy can provide a better identification and recognition of biological specimens at the molecular level due to the omission of water interference, especially that biological samples contain 70–80% water. Spectral acquisition by Raman spectroscopy gets less interference by water than ...
It is a traditional way to indicate the configuration of the Raman scattering experiment. This notation expresses the orientation of the crystal with respect to the polarisation of the laser in both the excitation and analysing directions. The notation of Porto, for Raman scattering processes, ...