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Raman spectroscopy

Raman spectroscopyInformation from Raman SpectroscopycharacteristicRaman frequenciescomposition MoS2,MoO3changes infrequency ofRaman Si 10 cm-1 shift per% strainpolarisation ofRaman peakcrystal symmetry orientation of CVDdiamond grainswidth of Ramanpeakquality amount of plasticdeformationparallelperpendiculari ntensity ofRaman peakamount thickness oftransparent coatingThe coupling of a Raman spectrometer withan optical microscope provides a number ofadvantages:1) confocal Light collection2) High lateral spatial resolution3) Excellent depth resolution4) Large solid collection angle for theRaman lightCollecting the lightThe basic function of a Raman system Deliver the laser to the sampling point With low power loss through the system Illuminating an area consistent with sampling dimensions Provide a selection/choice of laser wavelengths Collect the Raman scatter High aperture High efficienc

Confocal Raman microscopy without pinhole optics The use of a stigmatic spectrograph and stigmatic microscope-spectrometer coupling optics creates two additional conjugate image planes at the slit and CCD eliminating the need for pinhole optics! Conjugate image planes - Square pinhole Collection optic Preslit focusing lens Slit

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