Transcription of 13.24: Mass Spectrometry
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13.24: Mass Spectrometry
1 Chapter 13: spectroscopy Methods of structure determination Nuclear Magnetic Resonances (NMR) spectroscopy (Sections ) Infrared (IR) spectroscopy (Sections ) ultraviolet - visible (UV-Vis) spectroscopy (Section ) Mass (MS) Spectrometry (not really spectroscopy ) (Section ) Molecular spectroscopy : the interaction of electromagnetic radiation (light) with matter (organic compounds). This interaction gives specific structural information. 2 : Mass Spectrometry : molecular weight of the sample formula The mass spectrometer gives the mass to charge ratio (m/z), therefore the sample (analyte) must be an ion. Mass Spectrometry is a gas phase technique- the sample must be vaporized. Electron-impact ionization Sample Inlet10-7 - 10-8 torrR-Helectr on beam 70 eV (6 700 KJ/mol)e_R-H+massanalyze rm/zioniza tion chamber(M+)proton u neutron u electron u 13 mass m charge z ==B2 r2 2V B= magnetic field strength r = radius of the analyzer tube V= voltage (accelerator plate) The Mass Spectrometer Io niz atio nchamberIo ns of selectedmas s/charge rat ioare detect edIo ns o f n on-selectedmass/char ge r at ioar e not detect edMagnetic Field, Bo 4 Exact Masses of Common Natural Isotopes Isotope mass natural abundance 1H
• Ultraviolet-visible (UV-Vis) Spectroscopy (Section 13.23) • Mass (MS) spectrometry (not really spectroscopy) (Section 13.24) Molecular Spectroscopy: the interaction of electromagnetic radiation (light) with matter (organic compounds). This interaction gives specific structural information. 2 13.24: Mass Spectrometry:
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