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MS Lecture 1 - Why Spectroscopies are Needed Molecular...

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Why Spectroscopies are Needed? Molecular structure Molecular properties
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Introduction (Spectroscopic Techniques Covered in Chem460) The purer, the better. It is difficult to analyze spectroscopic data of a mixture. **We focus on spectral analysis, NOT theory**
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Determining the Structure of Elephant, a Large Molecule "The process of structural elucidation by spectroscopic methods is deductive. One or more spectroscopic experiments are carried out, and structural conclusions are reached by analyzing the resulting data." - Lambert et al "Organic Structural Spectroscopy Pieces of information from different spectroscopic techniques.
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Mass Spectrometry (MS) MW Molecular formula Structural information GC-MS LC-MS
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MS Principles Molecule Ions Ion separation Ion collector EI (electron impact) CI(chemical) DI(desorption FAB (fast-atom-bombardment) MALDI (matrix-assisted laser desorption) ESI(electrospray) Molecular ion + fragments (1) Hard ionization (2) Soft ionization Based on m/z values Magnet Magnet + electric field (double focusing) Quadruple mass filter Ion trap Time-of-flight
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