RelativeResourceManager(17) - Mass spectrometry Part I Chem...

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Mass spectrometry: Part I Chem 420 November 03, 2008 Professor Ryan C. Bailey
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What is mass spectrometry? z A versatile analytical technique used to determine the composition of chemical samples either at the atomic and/or molecular level. z Ionic forms of samples are separated according to differences in component mass-to-charge (m/z) ratio. z Signals from each different isotopic composition z Be aware of charge state Dichloromethane CH 2 Cl 2 12 C 1 H 2 35 Cl 2 = 84 13 C 1 H 2 35 Cl 2 = 85 12 C 1 H 2 35 Cl 37 Cl = 86 13 C 1 H 2 35 Cl 37 Cl = 87 12 C 1 H 2 37 Cl 2 = 88
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Basic instrumental setup for mass spectrometry Atomic mass spectrometry Chapter 11 Molecular mass spectrometry Chapter 20
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Generating ions in atomic mass spectrometry z Goal is to convert sample into ions that can the be subsequently be analyzed. z z ICP is the most predominant and will be discussed further here z Later we may cover laser microprobe and secondary ion techniques
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Inductively coupled plasma ion source in mass spec z ICP torch serves as both an atomizer and ionizer. z Not used for molecular mass spectrometry. z Refresher: z Plasma is an electrically conducing gaseous mixture z Torch consists of three quartz tubes through which Ar gas and the sample pass z Ar ionization is initiated by spark from Tesla coil z Ar ions interact with fluctuating magnetic field (from RF) and traverse annular path z Resistance of ions and electrons to charge flow leads to ohmic heating z Temperature levels up to 10,000 o K
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ICP-MS schematic
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for studying solid samples z High-powered pulsed laser used to rapidly vaporize solid sample. z
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This note was uploaded on 04/08/2010 for the course CHEM 420 taught by Professor Bailey during the Spring '08 term at University of Illinois at Urbana–Champaign.

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RelativeResourceManager(17) - Mass spectrometry Part I Chem...

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