拉曼光谱法素材.ppt

拉曼光谱分析法 刘和文 Remote Raman Analysis on Planetary Missions To allow Raman spectroscopy at range of 10s of meters. This NASA-funded project is aimed at Mars landers or landers on other planets, but also has terrestrial uses. 激光拉曼光谱基本原理 基本原理 Rayleigh / Raman Transitions Rayleigh / Raman Transitions and Spectra Rayleigh / Raman Transitions and Spectra The Spectrum Raman Spectroscopy Infrared and Raman Spectra of Benzene Some Raman Advantages Watch for Fluorescence Selection Rule for Raman Scattering Must be change in polarizability Non-Polar groups such as C-S, S-S, C=C, C?C (triple bond), N=N and heavy atoms (I, Br, Hg) strong scatterers Symmetric stretching vibrations are much stronger scatterers than asymmetric stretching vibrations Polarization Effects Polarization of CCl4 Polarization of CHCl3 Raman位移 拉曼光谱与有机结构 Raman and Infrared Spectra of H-C≡C-H Vibrational modes of methane (CCl4) Infrared and Raman Spectrum of CCl4 Raman Spectroscopy Relatively simple and non-destructive structure analysis technique of carbon materials Powerful tool for the structural characterization of diamond or amorphous carbon materials. Remote Raman Analysis on Planetary Missions To allow Raman spectroscopy at range of 10s of meters. This NASA-funded project is aimed at Mars landers or landers on other planets, but also has terrestrial uses. NSOM Raman Imaging Chemical Mapping Chemical Imaging Applications - Art Restoration Applications - Paint Chips Applications - Gem Forgery Applications - Bullet Proof Glass Applications - Sunscreen Formulations 激光Raman光谱仪 laser Raman spectroscopy Sources Sources-1 Detectors Spectrum of potassium titanyl phosphate. From Hans Hallen at NCSU. Squares are 5 x 5 μm square of this material doped with Rb. A near-field scanning microscope was used and the Raman signal was used to key the substrate response. Focus laser to small spot. Tune spectrometer to particular Raman transition peak. Raster scan the sample under the laser beam, record intensity