Atomic spectroscopy
Atoms have a number of excited energy levels accessible by visible-UV optical methods
Atomic spectra
Atomic Emission Schematic
Atomic spectroscopy for analysis
Flame Sources - remove solvent, free atoms, excite atoms
General issues with flames
Chemical interferences - FES
High energy sources
Atomic emission from spark or arc
Electrical ARC - sustained discharge between 2 electrodes
Electrical SPARK (AC)
Multielement analysis
Measuring emission lines
Issues and tradeoffs
DC coupled plasma emission
Inductively Coupled Plasma
AA Instrument Schematic
Atomic Absorption
AA instrumentation
Hollow Cathode Lamp Emission is from elements in cathode that have been sputtered off into gas phase
Light Source
Atomizers
AA - Flame atomization
Sources of error
Electrothermal atomization
Graphite Furnace AA
Closeup of graphite furnace
Controls for graphite furnace
Detector
Background corrections
Problems with Technique
Problems continued
Interferences
Interferences continued
PPT Slide
Gas laser
Dye laser
Diode laser
Email: ralph@virginia.edu
Home Page: http://www.people.virginia.edu/~roa2s/chem_551/
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