1. Atomic Absorption Terry A. Ring Chemical Engineering University of Utah

2. E= -13.6 eV Z 2 /n 2

3. Photo absorption/emision

4. Atomic Absorption

5. Lamps are Special Cathode with receptacle for material Vapor of Material to be analyzed Vapor Excited by plasma Light of particular wavelength

6. Aerosol Flow Burner Fuel (& oxidizer) mixed with aerosol of sample Sample asperated into burner Flame ionizes Sample

7. Intensity vs Wavelength in AA Light Source Absorbance Monochromatic Detector

8. Analysis Absorption of Light Electrons are excited Light Intensity on detector is less

9. Graphite furnace AA

10. Other AA’s Flame Spark Arc Plasma Laser X-ray

11. Atomic Emission Spectroscopy Flame is used to generated Atoms with excited electrons and ions Light is filtered in spectrometer to give Intensity vs wavelength

12. Spectrometer Emitted Light Broken into different color components –Prism –Grating

13. X-ray Fluorescence Two Steps –Absorption of X-ray Elimination of electron for k or L shell –Collapse of M shell electron to fill hole Light emission (x- ray)

14. Potential X-ray Emissions From K shell hole –K , K , K , –Zeeman Effect - 1, 2, 3 From L shell hole –L , L , L ,

15. Generation of X-rays High Voltage Electrons Electron Scattering Electron Absorption –X-ray photo ionization

16. XRF Energy-dispersive XRF Wavelength- dispersive XRF

17. XRF Detectors Energy-dispersive XRF –Semiconductor Wavelength dispersive XRF –Scintilation Counter

18. XRF Analysis Samples can be in any form –Solid –Powder –Liquid