Transcription of Raman spectroscopy - University of California, Irvine
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Raman spectroscopy - University of California, Irvine
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 efficiency optics High level of rejection of the scattered laser light Disperse the scattered light Short wavel
Raman spectroscopy utilizing a microscope for laser excitation and Raman light collection offers that highest Raman light collection efficiencies. When properly designed, Raman microscopes allow Raman spectroscopy with very high lateral spatial resolution, minimal depth of field and the highest possible laser energy density for a given laser power.
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