Thermal Analysis Terry A. Ring Chemical Engineering University of Utah.
Atomic Absorption Terry A. Ring Chemical Engineering University of Utah.
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Transcript of Atomic Absorption Terry A. Ring Chemical Engineering University of Utah.
Lamps are Special
• Cathode with receptacle for material
• Vapor of Material to be analyzed
• Vapor Excited by plasma
• Light of particular wavelength
Aerosol Flow
• Burner Fuel (& oxidizer) mixed with aerosol of sample
• Sample asperated into burner
• Flame ionizes Sample
Atomic Emission Spectroscopy• Flame is used to
generated Atoms with excited electrons and ions
• Light is filtered in spectrometer to give Intensity vs wavelength
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)
Potential X-ray Emissions
• From K shell hole– K, K, K,
– Zeeman Effect - 1, 2, 3
• From L shell hole– L, L, L,
Generation of X-rays
• High Voltage Electrons
• Electron Scattering
• Electron Absorption– X-ray photo
ionization
XRF Detectors
• Energy-dispersive XRF– Semiconductor
• Wavelength dispersive XRF– Scintilation Counter