The spectra of resonant coherent anti-Stokes and Stokes Raman scattering of excited molecules are calculated and discussed. The interaction of light and molecules is treated semi-classically. The energy level diagram of four energy levels describing the process is used in four modifications possible ...
aEnergy transfer process in Stokes (left) and anti-Stokes (right) Raman scattering, in both scattering processes, the lifetime of the excited state is probabilistic and spontaneous. In Stokes Raman scattering, the initial (ro-)vibrational energy|i〉of the scattering material is less than that o...
Raman spectroscopy measures the energy difference between vibrational modes by analysing the scattered light. Scattering occurs when a photon polarises the electron cloud of a molecule and raises it to a “virtual” energy state. Raman scattering occurs if the photons change energy during the scatterin...
In Raman Spectroscopy, photons which have been excited in the vibrationallevels in a molecule, are scattered so that they gain or lose energy.This inelastic scatteringprovidesinformation about the vibrational states of the molecule. A simplified energy diagram that illustrates these concepts is shown...
Fig. 4.Energy-level diagram showing the absorption, emission, luminescence and scattering spectra behaviour. Sign in to download hi-res image Fig. 5.Raman scattering basic principle. 4.2Raman spectra and intermolecular profile in amyloid studies ...
Herein we set out to develop a Raman-based water mapping technique for living cells. Raman scattering is a complementary way to IR absorption with high spatial resolution and is free from water background influence, rendering it a more suitable approach for cellular imaging22. Raman sensitivity ha...
d, e The electronic pre-resonance stimulated Raman scattering (epr-SRS) imaging of the same field of view with pump wavelengths set at 838.5 nm (nitrile mode on) and 836 nm (nitrile mode off). All the configurations for the FM-SREF imaging and SRS imaging are the same. The ...
.Figure1showstheenergy diagramsofRaman(a)“Stokes”scatteringand(b)Anti-StokesScattering. Figure1-EnergydiagramsofRaman(a)“Stokes”scatteringand(b)Anti-StokesScattering. Adoptedfrom[3] ThestimulatedRamanprocessoriginatesfromspontaneousRamanscatteringandrequireshigh pumpintensities.StimulatedRamanscatteringoccursif...
► A sample with a mass ratio of γ/(γ+α)>0.85 of the γ and α polymorphic phases of MgH2 is prepared under high pressure. ► Raman spectra of the γ and α polymorphs of MgH2 are measured at room temperature. ► Raman spectra of both polymorphs are computed using a DFT met...
asthatoftheincominglaserradiation,aprocessknownasRayleighscattering.However,a smallamount–approximatelyonephotonoutofamillion(0.0001%)–willscatterfromthat sampleatawavelengthshiftedfromtheoriginallaserwavelength. 3 Asillustratedinthefollowingsimplifiedenergyleveldiagram,amoleculeatrestresides ...