I am working on analyzing the mass spectrum of pentabromophenol but am struggling to determine the fragment at 60 m/z. It could possibly be 5 carbons however that is too much positive charge to exist at high abundance.

Below are the mass spec retrieved experimentally and from literature.

Literature Mass spec: NIST WebBook

Experimentally determined mass spectrum: Literature mass spec.

  • $\begingroup$ Can you give a zoom-in of the region around 55 - 65 m/z? $\endgroup$
    – Curt F.
    Commented Dec 8, 2015 at 14:32

1 Answer 1


It seems to have the 1:1 $\ce{Br}$ ratio spaced by 1.

I think a reasonable assignment would be that it is $\ce{[BrCCOH]^2+}$

m = 120 and 122

m/z = 60 and 61


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