Dumb question, just starting to learn about mass spectometry. I know we have to memorize the common radical fragments, M-15, M-29, etc, but lloking at the example, those numbers dont crrespond to the absorbance or the m/z, so for example, M-29.

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Analyzing and Predicting Spectroscopic Data

The interaction of electromagnetic radiation with the structure of molecules in the sample and their study is referred spectroscopy. Several spectroscopic methods are used to acquire sample information, and these methods are proved to be accurate, fast, and non-destructive. The information obtained about the content and composition of molecules from these spectroscopic methods is called spectroscopic data.