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Why is there a [M-1]+ in lieu of a parent signal in the Mass Spectrometry of Primary Alcohol Chains?

One possibility (R = alkyl or hydrogen): $\ce{RCH2 –OH -> RCH=\overset{+}{O}H + H• + e^-},$ where the cation shown is stabilized by the oxygen donating an otherwise nonbonding electron pair to what ...
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