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Raman spectroscopy

About: Raman spectroscopy is a research topic. Over the lifetime, 122605 publications have been published within this topic receiving 2891083 citations. The topic is also known as: Raman Spectrum Analysis & spectrum Analysis, Raman.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors carried out nonresonant and resonant Raman spectroscopy of ZnO quantum dots with diameter of 20nm and found that the spatial confinement of optical phonons in 20nm-diameter dots leads to only few cm−1 peak shifts.
Abstract: We carried out nonresonant and resonant Raman spectroscopy of ZnO quantum dots with diameter of 20nm. On the basis of our measurements and comparison with a recently developed theory, we were able to clarify the origin of the observed phonon peak shifts in quantum dots as compared to bulk ZnO. It has been found that the spatial confinement of optical phonons in 20-nm-diameter dots leads to only few cm−1 peak shifts. At the same time, we have demonstrated, that even a low-power ultraviolet laser excitation, required for the resonant Raman spectroscopy of ZnO, leads to strong local heating of the ZnO quantum dots, which results in very large (∼14cm−1) redshifts of the optical phonon peaks. We have estimated from the observed redshift that the local temperature of the quantum dot ensemble is about 700°C. The obtained results are important for identification of phonon peaks in the Raman spectra of ZnO nanostructures.

353 citations

Journal ArticleDOI
TL;DR: In this paper, the electronic and molecular structures of well-defined W(VI) bulk mixed oxide reference compounds consisting of isolated WO4 or WO6 monomers, dimeric O3W−O−WO3, polymeric chain of alternating WO 4/WO6 units, and WO 6-coordinated W9−W18 clusters were examined.
Abstract: Combined UV−vis diffuse reflectance spectroscopy (DRS) and Raman spectroscopy were applied to examine the electronic and molecular structures, respectively, of well-defined W(VI) bulk mixed oxide reference compounds consisting of (i) isolated WO4 or WO6 monomers, (ii) dimeric O3W−O−WO3, (iii) polymeric chain of alternating WO4/WO6 units, and (iv) WO6-coordinated W9−W18 clusters. Raman spectroscopy was employed to confirm the identity and phase purity of the different tungsten oxide structures. UV−vis DRS provided the corresponding electronic edge energy (Eg) of the ligand-to-metal charge transfer (LMCT) transitions of the W(VI) cations. A correlation between the edge energy and the number of covalent bridging W−O−W bonds around the central W(VI) cation was found with Eg linearly decreasing with increasing number of bridging W−O−W bonds. However, a direct relationship between Eg and the domain size, NW, for finite WOx clusters does not exist. Subsequently, UV−vis and Raman spectroscopy information were app...

352 citations

Book
25 Sep 2000
TL;DR: A survey of techniques, qualitative and quantitative analysis, and applications for infrared and Raman spectroscopy of biological materials can be found in this paper, with a focus on peptides and proteins.
Abstract: Historical survey of infrared and Raman spectroscopy of biological materials biological applications of vibrational optical activity vibrational circular dichroism of peptides and proteins - survey of techniques, qualitative and quantitative analysis, and applications biomedical applications of infrared microspectroscopy biophysical infrared modulation spectroscopy biological applications of time-resolved step-scan infrared spectroscopy FT-infrared and FT-Raman spectroscopy vibrational studies of enzymatic catalysis infrared and Raman spectroscopy and chemometrics of biological materials.

352 citations

Journal ArticleDOI
TL;DR: An overview of the theory of X-ray Raman scattering can be found in this article, where the results from radiative and non-radiative scattering experiments conducted with 2nd and 3rd generation synchrotron radiation sources during the last couple of years, dealing with atomic, molecular, solid state and surface adsorbate targets.

352 citations

Journal ArticleDOI
TL;DR: In this article, the structure of activated carbon materials is schematically classified into two parts: sharp G1 and G2 peaks and broad G2 and D2 peaks, sp2 clusters like a-Cs with bond angle disorder.
Abstract: Raman spectra of activated carbon materials have been investigated by a peak-deconvolution technique. It has been found as a result of our fitting trials that four Gaussians and a linear background are necessary and enough to reproduce the spectral data throughout our experiment, with a pair of relatively sharp peaks at about 1600 cm−1 and about 1350 cm−1, namely G1 and D1, and a pair of relatively broad peaks around 1560 cm−1 and 1340 cm−1, namely G2 and D2. From the characteristic behavior of these paired peaks, it has been concluded that the structure of activated carbon materials is schematically classified into two parts. The former part, represented by sharp G1 and G2 peaks, arises from winding short basal planes with bond angle order, while the latter, by broad G2 and D2 peaks, sp2 clusters like a-Cs with bond angle disorder. We have found the peak intensity ratio of G2 to G1, the I(G1)/I(G2) ratio, as a useful parameter expressing the relative content of the disorder part to the order part in the ...

352 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20235,220
202210,775
20214,240
20204,764
20194,957
20184,893