128B%20MassSpectra

128B%20MassSpectra - Mass Spectrometry (MS) H HCH H + e- H...

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1 Mass Spectrometry (MS) Molecular ion (A radical cation) + + + CH H H H C H H H e - 2e - H
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3 even-electron ions even-number mass odd-electron ions odd-number mass Ions having an odd # N atoms even-electron ions odd-number mass odd-electron ions even-number mass Ions with no nitrogen or an even # N atoms
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4 Resolution: a measure of how well a mass spectrometer separates ions of different mass – low resolution: at least one atomic mass unit – high resolution: as little as 0.0001 atomic mass unit –C 3 H 6 O and C 3 H 8 O have nominal masses of 58 and 60, and can be distinguished by low-resolution MS 3 H 8 O and C 2 H 4 O 2 have nominal masses of 60. Distinguish between them by high-resolution MS. C 2 H 4 O 2 C 3 H 8 O Molecular Formula 60.02112 60.05754 60 60 Precise Mass Nominal Mass CH 3 CH 2 OCH 3 CH 3 CCH 3 O CH 3 CH 2 OCH 3 HCOCH 3 O Isotopes Isotopes : - carbon, for example, in nature is 98.90% 12 C and 1.10% 13 C. Thus, there are 1.11 atoms of 13 C in nature for every 100 atoms of 12 C 0.38 15.0001 100 14.0031 1.11 13.0034 100 12.0000 0.016 100 2.01410 1.00783 Mass (amu) 15 N 14 N 12 C 13 C 2 H 1 H 14.007 12.011 1.0079 nitrogen
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128B%20MassSpectra - Mass Spectrometry (MS) H HCH H + e- H...

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