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587 08 wk03 MS - Mass Spectrometry • Quadrupole Mass...

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S.Foster Pfeiffer Vacuum 2002 S. Foster, Pfeiffer Vacuum 2002 Mass Spectrometry Quadrupole Mass Spectrometry Most commonly used in laboratories Least expensive of commercially available mass specs Detects up to 100 AMU commonly Can be extended easily to 300 AMU detection Downside: fragmentation patterns of molecules can be complex Upside: the simplest and least expensive mass spec (typically $15,000 to $35,000 depending on attachments; other types of mass specs can easily cost a few million)
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S.Foster Pfeiffer Vacuum 2002 S. Foster, Pfeiffer Vacuum 2002 Ion source: Tungsten filament Gas inlet Diaphragm Vacuum Pump Turbomolecular Drag Pump Analyzer: Quadrupole Mass Filter Detector: Faraday/ Channeltron Gas outlet
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3 S. Foster, Pfeiffer Vacuum 2002 Mass Spectrometer Basics Vacuum Requirements Ion Detection Ion Filtering Ion Creation
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4 S. Foster, Pfeiffer Vacuum 2002 Mass Spectrometer Basics e - Ion Source Quadrupole Mass Filter Ion Detector
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5 S. Foster, Pfeiffer Vacuum 2002 Vacuum Requirements Filament Longevity Typical Vacuum ~ 1 x 10 -6 Torr H H e - Gas Density ~ 10 10 molecules /cm 3 (@ 760 Torr (1 atm) ~ 10 19 molecules /cm 3 ) + Ion Mobility Detector Operation
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6 S. Foster, Pfeiffer Vacuum 2002 The Atomic Model 12 C = 12 A.M.U.
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