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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Unformatted text preview: of the isotope content. The ion relative intensities are accurate within 0.2% absolute or 10% relative whichever is smaller. Problem 1 m/z Rel. intensity ________________________ 201 1.3 200 10.1 199 6.3 198 64 197 11.1 196 100 ________________________ 1 Problem 2 m/z Rel. intensity ________________________ 101 0.2 87 1.1 74 0.5 73 14.3 62 0.2 61 14.4 57 2.8 56 44 44 2.3 43 100 ________________________ 2 Problem 3 m/z Rel. intensity ________________________ 157 2.2 156 100 141 2.2 129 0.5 128 8.8 127 48.3 30 1.9 29 90 ________________________ 3...
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This note was uploaded on 03/04/2010 for the course CHEM chem 520 taught by Professor Turecek during the Winter '10 term at University of Washington.

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

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