RelativeResourceManager2 - Chapters 8 and 9 Optical Atomic...

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Chapters 8 and 9 Optical Atomic Spectrometry Topics: 1. Atomic spectrometry and excited states Spin-Orbit Coupling and electronic state energies Sources of line broadening in atomic spectroscopy 2. Sample introduction methods for atomic spectrometry Nebulizers for liquid samples Introduction methods for solid samples 3. Types of atomizers 4. Interferences in atomic spectroscopy
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Origins of Atomic Spectra: Transitions Between Electronic States Example: Sodium Atoms
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Slight Complication: Spin-Orbit Coupling Atomic p-orbitals are split into two energy levels due to spin-orbit coupling. Spin orbit coupling : The energy level of an excited state is slightly elevated when the magnetic moments of the electron spin and orbital angular momentum are parallel. Any transition originating or ending in a p orbital actually has two separate transitions. The energy difference is so small a single line is typically observed. High resolution analysis would show the line as a doublet. [ ’s in Å]
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Factors affecting line width in atomic spectroscopy 1. Natural Broadening - The lifetime of the excited states leads to uncertainty in the transition energy. E  t =h/2 relationship Lifetimes of 10 -8 s lead to width of 10 -5 nm. 2. Collisional Broadening -Also referred to as Pressure Broadening’ Collisions of atoms in excited state with other species shortens excited state lifetimes and hence increases broadening
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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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RelativeResourceManager2 - Chapters 8 and 9 Optical Atomic...

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