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Mastering Spectroscopy: Unraveling Molecular Structures | Arkansas Workshop 2013

Join Lisa McGaw from OSU for a 2-day workshop in October 2013 focusing on Spectroscopy, a technique used to understand molecular structures by observing energy absorption-induced motions. Learn about IR, UV-VIS, Mass Spec, PES, and other spectroscopic methods to detect bonds and analyze organic and inorganic compounds. Gain insights into transitions in molecular motion, electronic energy levels, and isotopic data through hands-on experiments and theoretical discussions.

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Mastering Spectroscopy: Unraveling Molecular Structures | Arkansas Workshop 2013

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  1. SPECTROSCOPY 101 Arkansas 2-Day October 2013 Lisa McGaw OSU lmcgaw@me.com

  2. Spectroscopy • Spectroscopy –(In plain English) - a technique used to help us understand the molecular structure of matter by observing motion in response to the absorption of energy

  3. TYPES OF SPECTROSCOPY • IR • UV-VIS • MASS SPEC • PES • Many others – microwave, esr; x-ray; NMR; Raman; atomic absorption, etc.

  4. Electromagnetic Radiation and Transitions E = hν and c = λν

  5. IR Spectroscopy • 1.D (LO 1.15) • Transitions in molecular motion – rotational, vibrational and electronic (low energy to high energy) • https://en.wikipedia.org/wiki/Infrared_spectroscopy • Detect presence of different types of bonds • Useful for identification and structural analysis of organic and inorganic compounds.

  6. Dichloromethane near IR

  7. UV- Vis Spectroscopy • 1.D (LO 1.15 and LO 1.16) (SP 4.1, 4.2, 5.1 and 6.2) • Transitions in electronic energy levels • Used to probe electronic structure • Molecules absorb UV or Visible light • A = abc (absorption directly related to concentration)

  8. How Do the Colors Relate? • UV region – not visible to our eyes • Visible region – ROYGBIV • Low energy  higher energy

  9. UV Spectroscopy

  10. Blue Dye

  11. Standard Curve

  12. Mass Spectroscopy • 1.D (LO 1.14) (SP 1.4 and SP 1.5) • Demonstrates direct evidence of different isotopes from the same element • Average atomic mass estimated from mass spec data • Solid, liquid or gas sample is ionized; • Ions are separated according to mass to charge ratio

  13. Isotopic Data for Bromine (web elements.com)

  14. PES Spectroscopy • 1.B (LO 1.7* also LO 1.5, 1.6, 1.8) (SP 1.5, 5.1, 6.2) • Photoelectric effect – incident light ejects electrons • Energies provide evidence for shell model • Intensity of signal implies number of electrons at that energy level

  15. PES Spectroscopy

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