Lecture 9 with ink

Lecture 9 with ink - Lecture 9 Mass Spectrometry Combined...

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Lecture 9
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Mass Spectrometry Combined Spectra
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Not a form of spectroscopy because light is not absorbed Involves removing an electron through lectron impact (EI MS) electron impact (EI MS) O O
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Mohrig Chapter 20
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Since there are different isotopes of atoms, they show up too. Abundance of 1 H is about 99.9% and 2 H is about 1% 0.1% 13 C ~ 1.0% and 12 C ~99.0% Because of isotopes, we have a new term: Exact Mass The mass of the compound considering the highest otope of each atom isotope of each atom. Other smaller peaks in proximity represent isotopic differences in mass
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Mass Spectra and the Molecular Ion
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It would be difficult to differentiate between these two compounds using IR or NMR sing MS each compound will have a Using MS, each compound will have a different exact mass and different isotope attern. pattern. Bromine: 79 Br : 81 Br 1:1 ratio Chlorine: 35 Cl : 37 Cl 3:1 ratio
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Particularly useful for detecting Bromine
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Isotopes show up
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Each peak gives you an exact mass Each peak is a mass to charge ( + 1) ratio MS is a messy looking spectra because: Compound injected has different ratios of isotopes You see each compound in isotopic abundance
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This note was uploaded on 04/09/2010 for the course CHEM 6a taught by Professor Pettus during the Winter '07 term at UCSB.

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Lecture 9 with ink - Lecture 9 Mass Spectrometry Combined...

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