Raman Spectroscopic Analysis
Raman Spectroscopic Analysis - Related Videos
09:26
Raman Spectroscopy for Chemical Analysis
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2023
Source: Laboratory of Dr. Ryoichi Ishihara — Delft University of Technology Raman spectroscopy is a technique for analyzing vibrational and other low frequency modes in a system. In chemistry it is used to identify molecules by their Raman fingerprint. In solid-state physics it is used to characterize materials, and more specifically to investigate their crystal structure or crystallinity. Compared to other techniques for investigating the crystal structure (e.g. transmission electron...
08:13
A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
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Cited by 8 •
2016
A procedure for fabrication and performing the filter-based surface enhanced Raman spectroscopic (SERS) assay for the detection of chemical contaminants (i.e., pesticide ferbam and antibiotic ampicillin) is presented.
11:53
Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
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Cited by 1 •
2018
This article describes specific methods to obtain biochemical quantities of detergent-solubilized TRPV1 for spectroscopic analysis. The combined protocols provide biochemical and biophysical tools that can be adapted to facilitate structural and functional studies for mammalian ion channels in a membrane-controlled environment.
06:19
Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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Cited by 2 •
2022
The present protocol describes a convenient approach to integrating optical trapping and surface-enhanced Raman spectroscopy (SERS) to manipulate plasmonic nanoparticles for sensitive molecular detection. Without aggregating agents, the trapping laser assembles plasmonic nanoparticles to enhance the SERS signals of target analytes for in situ spectroscopic measurements.
07:51
Combining Raman Imaging and Multivariate Analysis to Visualize Lignin, Cellulose, and Hemicellulose in the Plant Cell Wall
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Cited by 16 •
2017
This protocol aims to present a general method to visualize lignin, cellulose, and hemicellulose in plant cell walls using Raman imaging and multivariate analysis.
FAQs
The measurement separates the intense elastic-scattering signal from the much weaker inelastic component. Elastic scattering leaves photon frequency unchanged, whereas Raman-scattered photons emerge with frequency shifts. Those shifts arise from energy exchanges with molecular vibrations or crystal lattice vibrations, allowing the spectrum to emphasize vibrational behavior rather than simply recording the incident illumination.
Each frequency shift corresponds to vibrational behavior associated with the sample. Molecular vibrations can provide evidence about composition and bonding, while crystal lattice vibrations help characterize structural features such as phase. Because the resulting pattern depends on these material-specific motions, it can function as a chemical and structural fingerprint for identification and characterization.
Although only a small fraction of the photons undergoes inelastic Raman scattering, that fraction carries information that elastic scattering does not provide. Its frequency changes reflect interactions with molecular or lattice vibrations, linking the measured spectrum to the material’s internal structure. This makes the signal useful for examining composition, bonding, phase, strain, and related properties.
A laser first illuminates the specimen, and the scattered light is then measured to produce a spectrum. Analysis focuses on the frequency-shifted Raman component rather than the unchanged elastic-scattering contribution. Interpreting the positions and pattern of the shifts allows researchers to characterize the sample’s composition, structure, bonding, phase, or other material properties.
Raman Spectroscopic Analysis often requires minimal preparation because the measurement can examine a specimen without altering it. The sample is illuminated directly with a laser, and the scattered light supplies the analytical signal. This combination of limited preparation and non-destructive measurement is useful when preserving the original specimen matters, including for biological, pharmaceutical, mineral, and materials samples.
The technique supports studies of semiconductors, minerals, nanomaterials, pharmaceuticals, and biological samples. In physics, spectra can help characterize material composition and structure while also revealing properties such as phase and strain. Its broad applicability comes from connecting measured frequency shifts with molecular or crystal lattice vibrations, allowing diverse specimens to be examined through a common optical approach.