homework_HWK1 - of the isotope content The ion relative...

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Analytical Mass Spectrometry CHEM 520 Homework 1 February 1, 2010 Due February 8, 2010 Problems 1,2,3: Use stable isotope ratios for A, A+1, A+2 and A-1 (wherever appropriate) elements to assign probable elemental compositions to the peaks listed in the tables. Use the tables and spectra to assign molecular ions to the unknowns. Note: Isotope ratios for fragment ions may be less reliable, because parts of (A+1) and (A+2) peaks can be due to different chemical species from hydrogen migrations in fragmentation, e.g., A + H and A + 2H ions. The (A+1)/A ratios give only the upper bounds
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