Transcription of Raman spectroscopy: Basic principles and applications
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Raman spectroscopy: Basic principles and applications
Christian HessRaman spectroscopy: Basic principles and applications Basic principles - Resonance Raman scattering - Surface Enhanced Raman Scattering (SERS) Instrumentation -Spectrometer- Excitation sources Raman in catalysis- In situ cells- In situ Raman (of working catalysts) Raman (1928) Basic principles - Resonance Raman scattering - Surface Enhanced Raman Scattering (SERS) Instrumentation -Spectrometer- Excitation sources Raman in catalysis- In situ cells- In situ Raman (of working catalysts)C. Hess, 2006 Why Raman spectroscopy? Information on rotational and vibrationallevels Raman effect small but accessible by use of lasers Complementaryinformationto IRspectroscopyphomonuclear diatomic molecules, low frequency range In situ analysisof organic and inorganic compounds Analysis of aqueous solutions and solids(powders) Using resonance and surface enhancement effects ~1010pTrace gas/single molecule analysis- molecular structureIntroductionC. Hess, 2006 Spatial charge separation under influence of electric fieldEpinduced dipole moment : = E(1) : polarizabilitypExample: polarizability changes during CO2vibrationsClassical descriptionC.
Fluorescence (organic samples/water) choice of laser wavelength: ... • X-ray analysis confirms the presence of BaO/MgO C. Hess, 2006. 1020 1050 Raman shift (cm-1) 1080 Minutes: 20.0 9.0 7.5 10.0 0 5 10 50 30 M i nu t es 134 731 1048 1% NO …
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