Compound is first vaporized and converted into ions, which are then separated and detected. Electron Impact (EI) Mass Spectrometry 1.

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Presentation transcript:

Compound is first vaporized and converted into ions, which are then separated and detected. Electron Impact (EI) Mass Spectrometry 1

The Mass Spectrum It is a graph of the relative abundance of each positively charged fragment plotted against its m/z value. Results may also be presented in tabular form. 2

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Example 1: Determine the molecular formula for a compound that gives the following mass spectral data: m/z intensity 86 100.0 (M+) 87 5.6 88 0.4 8

Example 2: Determine the molecular formula for a compound that gives the following mass spectral data: m/z intensity 43 79.0 44 100.0 (base) 72 73.0 (M+) 73 3.3 74 0.2 9

Fragmentation Patterns of Hydrocarbons 16

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Fragmentation Patterns of Alkyl and Aryl Halides 18

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