核磁,质谱课件 图谱.ppt

Mass Spectrometry Fundamentals Key topics: Mass spectrometer Ionization, Mass analyzers, Mass spectrometers Charge state of protein and peptides MALDI-TOF MS, ESI MS Mass spectrum Isotope and mass, Isotope abundance Quality parameters of mass spectrometer Resolution, Mass accuracy, Sensitivity Isotopic Abundance Mass Spectrum with Sulfur Mass Spectrum with Chlorine Mass Spectrum with Bromine Mass Spectra of Alkanes More stable carbocations will be more abundant. Mass Spectra of Alkenes Resonance-stabilized cations favored. * (a+b)n = = = = = *