587 08 wk03 MS 2pg notes

587 08 wk03 MS 2pg notes - Mass Spectrometry Quadrupole...

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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) 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 ¾ Vacuum Requirements ¾ Ion Detection ¾ Ion Filtering ¾ Ion Creation 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 ¾ 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 ) + ¾ Ion Mobility ¾ Detector Operation 6 S. Foster, Pfeiffer Vacuum 2002 The Atomic Model 12 C = 12 A.M.U.
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587 08 wk03 MS 2pg notes - Mass Spectrometry Quadrupole...

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