AA spec - CH 8-10 Atomic Spectroscopy HW: 8-9, 9-15, 9-16,...

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CH 8-10 Atomic Spectroscopy HW: 8-9, 9-15, 9-16, 9-20, 10-1, 10-6, 10-8, 10-9, 10-11 Three common methods for identifying elements present in a sample: (1) Atomic Absorption/emission Spectroscopy (CH 8-10) Analysis of metals (2) Mass Spectrometry (CH 11) Analysis of metal complexes, particles, proteins, organic molecules (3) X-ray Spectroscopy (CH 12) Analysis of particles and surfaces
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Atomic Absorption and Emission Spectroscopy What are the atomic-level details behind this experiment? Sample is sprayed into a high-temperature atomizer to create gaseous atoms/ions, and then optical absorption/emission/fluorescence spectra are acquired.
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CH 8-10 Atomic Spectroscopy Atomic Energy Level Diagrams Recall the basic atomic energy level diagram. This diagram might lead one to believe that light-induced electronic transitions are very simple. They should be: (1) Narrow in wavelength. (2) Exactly equal to the differences in energy levels shown in the diagram.
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CH 8-10 Atomic Spectroscopy In reality, atomic absorptions are always broad (more than a single wavelength absorbed), and there are more absorptions than one would expect from the energy level diagram. Electric Pickle Na Doublet from an Electric Pickle
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CH 8-10 Atomic Spectroscopy Note the splitting of the p level into a doublet. This is a magnetic field effect that occurs in part because electrons have spin, and any oscillating electric field produces a magnetic field. In fact, the observation of this “fine structure” was the first evidence of electron spin. An applied magnetic field can split the levels even further, creating even more emission lines. This is the Zeeman Effect.
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CH 8-10 Atomic Spectroscopy Key Concept* : When an atom has two electrons in its ground state, two different excited states may be generated that differ in energy. These are determined by the formula 2s + 1, where s is the sum of the electron spins. This is called the spin multiplicity.
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CH 8-10 Atomic Spectroscopy Atomic Line Widths Atomic absorption and emission line widths are not completely narrow as one might except from transitions between two discrete energy states.
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This note was uploaded on 02/23/2011 for the course CHEM 4181 at Colorado.

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AA spec - CH 8-10 Atomic Spectroscopy HW: 8-9, 9-15, 9-16,...

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