How to interpret a Mass Spectrometry graph? (dumbed-down version please)?

scoequinesabre · #1 25-06-2007, 05:25

I've been reading everything I can, but am having no luck working out the details of Mass Spec. Can you please give me a "dumbed-down" explanation of how this is done? I know that you use the M+ peak to = the molecular weight of the structure to be determined and that each significant peak equals parts of the structure (ex. 15 = CH3 methyl) but I'm confused about: do you only refer to the peaks with they're m.w. labeled on the top of the peak to determine the structure?how do you determine if the structure is aromatic, etc?

smilam · #2 25-06-2007, 07:10

It's based on mass to charge ratios. Methyl is 15 when it has a -1 or +1 charge. Mass spec usually does not tell you everything you need to know because a lot of fragments have similar m/z ratios. Usually they give you an IR or NMR to go with it. There are also books and probably webpages that give you some common fragments and they're m/z. Another helpful thing is to look for multiples, like if you see a 15 for methyl you might want to look for CH2, which would be at 7.

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