Stokes Scattering
Stokes Scattering - Related Videos
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
0 Views •
Cited by 1 •
2016
Efficient generation of nonlinear phenomena related to third order optical non-linear susceptibility Χ(3) interactions in triply resonant silica microspheres is presented in this paper. The interactions here reported are: Stimulated Raman Scattering (SRS), and four wave mixing processes comprising Stimulated Anti-stokes Raman Scattering (SARS).
12:56
Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering (CARS)
0 Views •
Cited by 2 •
2010
A combination of three single wavelength short-pulsed lasers is used to generate coherent anti-Stokes Raman scattering (CARS) and doubly-resonant CARS (DR-CARS). The difference between these signals provides enhanced sensitivity for otherwise difficult to detect coherent Raman signals, enabling imaging of weak Raman scatterers.
09:46
Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
0 Views •
Cited by 7 •
2022
This paper directly compares the resolution, sensitivity, and imaging contrasts of stimulated Raman scattering (SRS) and coherent anti-Stokes Raman scattering (CARS) integrated into the same microscope platform. The results show that CARS has a better spatial resolution, SRS gives better contrasts and spectral resolution, and both methods have similar sensitivity.
09:59
Coherent anti-Stokes Raman Scattering (CARS) Microscopy Visualizes Pharmaceutical Tablets During Dissolution
0 Views •
Cited by 25 •
2014
Coherent anti-Stokes Raman scattering (CARS) microscopy is combined with an intrinsic flow-through dissolution setup to allow in situ and real-time visualization of the surface of pharmaceutical tablets undergoing dissolution. Using this custom-built setup, it is possible to correlate CARS videos with drug dissolution profiles recorded using inline UV absorption spectroscopy.
01:20
Stokes' Law
0 Views •
2025
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature. The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only for low Reynolds...
FAQs
During Stokes scattering, the incident field briefly drives a molecule into a virtual state rather than a lasting electronic state. The molecule then emits light while ending in a vibrational or rotationally excited level. This energy bookkeeping explains why the emitted photon carries less energy and why the missing energy records a molecular transition.
Band positions in a Stokes spectrum correspond to differences between molecular energy levels, especially those associated with vibrational or rotational excitation. Because each chemical environment has its own set of energy-level separations, the pattern of shifted bands can serve as a molecular signature. Interpreting those positions therefore connects spectral observations with structure and composition.
Band intensity adds information beyond the location of a signal. In Raman measurements, the relative strengths of Stokes bands help chemists assess the observed molecular composition alongside the band positions. Considering both features gives a richer description of a sample and supports chemical analysis rather than relying on a single spectral shift.
Raman spectroscopy measures the Stokes-shifted signals produced when a sample interacts with incident light. Analysts compare the resulting band positions and intensities with the molecular information they represent to identify compounds, investigate structure, and assess composition. A practical advantage is that these chemical insights can be obtained without extensive sample preparation.
During reaction monitoring, changes in Stokes bands can be followed as the chemical system changes, providing a way to track evolving composition. The same spectral information supports materials characterization, where band positions and intensities provide chemically relevant information about a material. These uses extend the method from compound identification to observing chemical processes and materials.
Because Stokes signals reflect molecular energy-level differences, examining their band patterns can support studies of molecular interactions. Chemists can use this spectral evidence to move beyond identifying individual compounds and toward understanding relationships within a chemical system. The approach connects measurable scattering features with molecular behavior.