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Espalhamento Raman Introdução. Espalhamento de luz

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Presentation on theme: "Espalhamento Raman Introdução. Espalhamento de luz"— Presentation transcript:

1 Espalhamento Raman Introdução

2

3 Espalhamento de luz http://www.andor.com/learn/applications/?docid=64

4 Modificação na freqüência Freqüência modificada Freqüência incidente Freqüência característica do material

5 Espectro http://commons.wikimedia.org/wiki/File:Raman_spectra_of_drugs.jpg

6 2TA(X) Ac & opt. in 2TO(X) 2TO(W) 2TO(L)

7 Os dois lados da moeda http://www.smartec.ch/images/Scattering_spectra.gif

8 Esquema de níveis de energia

9 Montagem experimental típica http://www.andor.com/learn/applications/?docid=64

10 Montagem experimental

11 http://spectra.phy.bris.ac.uk/Media/InVia%20anime.gif

12 Modelo do oscilador harmônico http://131.104.156.23/Lectures/CHEM_207/vibrational_spectroscopy

13 Efeitos isotópicos

14 Spatial correlation model

15 Modos normais de vibração Representation of two normal modes of benzene http://mvl.chem.tu-berlin.de/ak_hildebrandt/hildebrandt/methods/VibrationalSpectroscopy.html

16 Plasmônica aplicada: SERS http://www.ipht-jena.de/uploads/pics/sers-schema_425_03.jpg Surface Enhanced Raman Scattering

17 Vencendo a difração Nanotubos de carbono

18 Sofisticações: TERS http://spie.org/Images/Graphics/Newsroom/Imported/426/426_fig2.jpg Tip Enhanced Raman Scattering

19 Coherent Anti-Stokes Raman Scattering (CARS) http://en.wikipedia.org/wiki/File:CARS_diagram.png

20 Raman ressonante Real

21 Transições ópticas http://hyperphysics.phy-astr.gsu.edu/HBASE/molecule/molec.html#c2

22 Raman optical activity (ROA) Hen Lysozyme http://www.chem.gla.ac.uk/staff/laurence/recent_roa_talk.ppt#259,13,Hen Lysozyme

23 Aplicações Raman diagnostic tool detects eye disease MEDICAL SPECTROSCOPY http://www.laserfocusworld.com/display_article/119897/12/none/none/News/Raman-diagnostic-tool-detects-eye-disease

24 Aplicações Raman studies may help predict bone fracture SPECTROSCOPY http://www.laserfocusworld.com/display_article/101870/12/none/none/News/Raman-studies-may-help-predict-bone-fracture

25 Aplicações Raman scattering reveals macular pigment levels MEDICAL SENSING http://www.laserfocusworld.com/

26 Aplicações Raman Spectrometer Probes the Deep More than two miles below the surface, a curious Pacific grenadier watches the Deep-Ocean Raman In Situ Spectrometer interrogate a pool of liquid CO2 on the sea floor. Courtesy of Peter G. Brewer. http://www.photonics.com/Content/ReadArticle.aspx?ArticleID=18402

27 Aplicações Mobile Raman Targets Chemical Spills Researchers at Brookhaven National Laboratory have developed a mobile Raman spectroscopy system to remotely assess unknown chemical spills in emergency situations. The system uses 266-nm Raman lidar to target samples more than 1700 feet away. http://www.photonics.com/Content/ReadArticle.aspx?ArticleID=8282


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