RelativeResourceManager4 - CHEM 4241 Tuesday, September...

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CHEM 4241 Tuesday, September 20 th 2011 1 Plan for Today Announcements/business 1. Optional make-up multiple choice test Thursday 30 minutes at the start of Thursday’s class You need scantron card 2. Last reports will be returned Thursday 3. Next lab reports due on Monday Chapter 7 4. Hardware for Optical Analyses
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Components of Optical Spectrometers 1. Source 2. Sample 4. Radiation Detector 3. Wavelength Selector 5. Signal Processor And Readout
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Which of a, b, c depicts fluorescence, emission and absorbance spectrometers?
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Radiation Sources Continuum Sources Line Sources Lasers
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The broad emission spectra of continuum sources is explained by blackbody radiation 5 Continuum Sources are used when a broad range of wavelengths are needed for measurements. Blackbody radiation simulator
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Black-body radiation 7-3, 7-4, 7-5
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Common line source: hollow cathode lamp A large voltage (300 V) is applied between the electrodes. The buffer gas is ionized. Buffer gas ions smash into the cathode, causing the sputtering of metal atoms in excited states. The cathode is constructed of a metal whose emission spectrum is desired (matches the absorption spectrum of atoms of the same type, i.e. the analyte). Hollow cathode lamps are common for atomic absorption.
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The sputtering phenomenon Fill gas is either Ne or Ar.
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The following combinations have been found to give satisfactory emission with minimal or no spectral interferences. Ag/Cd/Pb/Zn
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This note was uploaded on 09/28/2011 for the course CHEM 4241 taught by Professor Kreller during the Spring '11 term at Georgia Southern University .

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RelativeResourceManager4 - CHEM 4241 Tuesday, September...

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