01_22_spectrometer - Optical Spectrometers Text, Chapter...

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Optical Spectrometers Text, Chapter 7A-D Radiation Sources (e.g., Lasers) Monochromator (Grating, Slit)
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Basic Schematic absorption fluorescence, scattering emission
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Glo-bar IR source Heat a material until it glows (usually by running current through a resistive material) Output follows black body radiation law fairly well (e.g., a continuum source) Examples: Tungsten lamp, Nernst glower (ZrO 2 + Y 2 O 3 )
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UV-visible light sources UV – discharge in high pressure H 2 or D 2 – continuum radiation in UV to about 350-400 nm. Visible: Heated tungsten filament gives black-body radiation
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LASER L ight A mplification by S timulated E mission of R adiation Spontaneous emission : A molecule emits an electromagnetic wave with random direction and phase. Stimulated emission : The electromagnetic wave emitted adds in phase and direction to the electromagnetic wave that stimulated the emission – coherence . Amplification when rate of stimulated emission > rate of absorption
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Laser can be pumped by another light source (another laser or a flash lamp), electric
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This note was uploaded on 10/24/2009 for the course CHEM 447 taught by Professor Staff during the Winter '08 term at University of Michigan.

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01_22_spectrometer - Optical Spectrometers Text, Chapter...

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