1. OPTICS, LASERS, AND MOLECULES: A STUDY OF RAMAN SPECTROSCOPY Stephen Carr, Mojin Chen, Brian Delancy, Jason Elefant, Alice Huang, Nate May, Avinash Moondra, John Nappo, Nick Paggi, Sam Rosin, Marlee Silverstein, Dan Zhang Advisor: Dr. Robert Murawski Assistant: Aaron Loether

2. What is Spectroscopy? Break light into constituent wavelengths Study of interaction between light and matter

3. Understanding Spectroscopy In order to understand spectroscopy, we must first look at: o Optics o LASERs

4. Optics Optics: study of light Light: electromagnetic radiation o Wave-like properties  Reflection  Diffraction  Refraction o Particle-like properties  Quantization

5. Converging Lens Object focused through a convex (converging) lens Curved shape focuses light to single point

6. LASER Light Amplification by Stimulated Emission of Radiation

7. Lasers Highly controlled beam of light Emit monochromatic light with identical wavelengths that are completely in phase High accuracy measurements Better suited for use in optical analyses than other light sources Easily manipulated by optical devices, i.e. lenses

12. Raman Effect 1928 C.V. Raman discovered Raman effect o Used heavily filtered sunlight in place of a laser o Observed the energy change between the initial laser energy and the emitted energy

13. Raman Spectroscopy A light scattering technique in which photons interact with a sample to produce scattered radiation of varying wavelengths Allows one to obtain vibrational spectra of substances in aqueous solution Measured in wavenumbers (cm -1 )

15. Why is it Useful? Gives detailed information about molecular structure Can be used to examine: o Rotational and vibrational states of a system o Number, strength, and identity of chemical bonds

16. The Apparatus (Helium-Neon)

17. Helium-Neon Laser Setup

18. The Apparatus (Argon-Ion)

19. Argon-Ion Laser Setup

20. Our Project Determine effectiveness of RS by: o Analyzing methanol, ethanol, and fertilizer samples in varying concentrations o Testing for impurities and foreign molecules in different samples of water

21. Data: Methanol

22. Data: Ethanol

23. Data: Ethanol Concentrations

24. Data: Fountain Water vs. SmartWater

26. Data: Fertilizer

27. Data: Pond Water & Fertilizer

28. Applications in Real Life Identify Molecules Environmental Monitoring Explosives/Contraband Quality Control/Commercial Industry Biochemistry/Medical Applications Art Examination and Preservation Electronics and Semiconductors

29. Acknowledgements Dr. Robert Murawski Aaron Loether Stephen Takacs H Sudol Drew University Staff of NJGSS '10

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