Transcription of Mass Spectroscopy
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Mass Spectroscopy
1 mass SpectroscopyMass Spectroscopy is a technique causing the formation of the gaseous ions with or without fragmentation; the gas phase ions are then characterized by their mass to charge ratios (m/z) and their relative MS, compounds are ionized. The ionized molecule often fragments into smaller ions/radicals. The positively charged fragments produced are separated based on their nominal_mass/charge (m/z) ion daughter ions, radicals, neutralsMost of the ions has z=+1, thus in a given ion, m/z = mass of the plot of relative abundance of ions vs m/z of all charged particles is the mass fragmentationM M+.M+1+ M+.2+..+N1+ N2. + .. If the quantity of energy supplied to a molecule is greater than it s ionization energy a molecular ion is formed (parent ion).The mass spectral pattern is unique to a molecule(fingerprint), especially massMolecularion M+.Molecularion M+.++Base peakv. stable ionDaughter ionsFree radicalsneutralsMass Spectrum presented as a bar Peak M+.
High resolution mass spectrometers that can determine m/z values accurately to four/more decimal places, making it possible to distinguish different molecular formulas having the same nominal mass. MF Unsaturation Exact Mass C2H2O3 2.0 74.00040 CH 2N2O2 2.0 74.01163 C6H2 6.0 74.01565 C3H3FO 2.0 74.01679 C2H3FN 2 2.0 74.02803 C3H6O2 1.0 74.03678
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