Transcription of CHAPTER 2 Fragmentation and Interpretation of Spectra 2.1 ...
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CHAPTER 2 Fragmentation and Interpretation of Spectra 2.1 ...
1 CHAPTER 2 Fragmentation and Interpretation of Spectra Introduction Before discussing Fragmentation and Interpretation , it is important to understand the many ways mass Spectra are utilized. For the analytical chemist, a mass spectrum is useful for two applications. The first is the relatively simple case when the analyst is looking for a particular compound in a sample and has a reference material to compare Spectra . The second occurs when an analyst observes the presence of an unknown and wishes to identify it. The mass spectrum allows an experienced analyst to identify the compound or at a minimum narrow the possibilities down to a few compounds from the millions of potential chemicals. Then, a reference standard can be more easily selected from this knowledge to confirm the identity of this unknown. A similar situation exists for the synthetic chemist except their analytical tool box is much larger.
majority of organic compounds that are analyzed using the GC-MS are made up of these elements, this stipulation is practically ignored. Figure 2.2 The Nitrogen Rule - The mass spectrum of N,N-dimethyl-ethanamine illustrates the presence of an odd molecular ion and even fragments. Spectra from the NIST/EPA/NIH Mass Spectral Library. Reprinted with
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