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Chapter 8: An Introduction to Optical Spectrometry

Chapter 8: An Introduction to Optical Spectrometry . Atomic Energy . Configuration leads to distinct a bsorption pattern for each element. Singlet and Triplet States. Singlet excited – change of energy Triplet – change in energy level and spin. Sample Introduction .

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Chapter 8: An Introduction to Optical Spectrometry

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  1. Chapter 8: An Introduction to Optical Spectrometry

  2. Atomic Energy Configuration leads to distinct absorption pattern for each element

  3. Singlet and Triplet States Singlet excited – change of energy Triplet – change in energy level and spin

  4. Sample Introduction Nebulization – process of taking a bulk sample and creating a mist Electrochemical Vaporization – heating up from electrical current

  5. Nebulizers • Puts the sample in a fine droplet to isolate • atoms of interest for absorption • Can look at emission

  6. The glow discharge is a way to atomize. It provides current.

  7. Chapter 9: Atomic Absorption and Atomic Fluorescence Spectrometry

  8. AA Sample Introduction

  9. Zone Regions in AA Flame Primary combustion zone is the hottest.

  10. Laminar Flow Burner Fuel and oxidants mix to create pressure and flow to sustain flame, which creates suction. Forces the sample to the nebulizer. Baffles change the flow to mix sample in the air flow.

  11. Graphite Furnace Sample is heated in the graphite tube and gets hot quickly. An electrothermal atomizer Sends a light beam through and will either be absorbed or not absorbed depending on atoms

  12. Emission Vs. Absorption Emission – more defined line Absorption – much broader band

  13. Hollow Cathode Lamp Generates a signal that is absorbed. Made up of the element of interest Allows to quantify and identify a specific element Flow from anode to cathode creates excitation then emission, which is light.

  14. Block Diagram of AA

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