CH_318N_Lecture1-08_Spring_08

CH_318N_Lecture1-08_Spring_08 - Welcome! Chemistry 318N...

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1 Chemistry 318N Welcome!! Chemistry 318N Organic Chemistry for Chemical Engineers Professor: Grant Willson Teaching Assistants: Xinyu Gu and Brandon Rawlings http://willson.cm.utexas.edu Chemistry 318N Bureaucracy: c Please read the syllabus carefully c Attend all lectures c Do the homework c Don’t get behind c Take advantage of office hours – We want to get to know you c Watch the web page – http://willson.cm.utexas.edu (teaching) c Don’t get behind!! c Keep up with the work! c You can’t “cram” for the exams in this class
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2 Chemistry 318N Submit Here Collect Here Chemistry 318N Mass Spectrometry
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3 Chemistry 318N A Mass Spectrometer c A mass spectrometer is designed to do three things: 1. Convert neutral atoms or molecules into a beam of positive (or negative) ions 2. Separate the ions on the basis of their mass-to-charge ratio (m/z) 3. Measure the relative abundance of each ion Chemistry 318N Mass Spectrometer
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4 Chemistry 318N magnet In here Out here Scientist Chemistry 318N Modern Mass Spectrometer unit mass resolution Scientist Mass Spectrometer
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5 Chemistry 318N A Mass Spectrometer c Electron ionization MS – In the ionization chamber, the sample is bombarded with a beam of high-energy electrons – Collisions between these electrons and the sample result in loss of electrons from sample molecules and formation of positive ions Molecular ion (A radical cation) + + + C H H H H C H H H e - 2 e - H Chemistry 318N Molecular Ion c Molecular ion (M or M
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CH_318N_Lecture1-08_Spring_08 - Welcome! Chemistry 318N...

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