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Natasha_4902
#1 Posted : Wednesday, June 24, 2020 1:34:12 AM
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Hi,

For question 86 on page 111 of the EK Biology 1 book, how can the base peak be 15 m/z if the parent peak is 134? I thought the parent peak was always shorter than the base peak (as it says on page 110).

Thank you
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INSTR_Katerina_102
#2 Posted : Thursday, June 25, 2020 10:21:18 PM
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Hi,

A base peak is the peak with the largest absorbance - this is often not the same as the molecular peak as Electron Impact Mass Spectrometry (the method on page 110) often fragments molecules during the process.

Just to reiterate:

Parent peak = biggest Molecular Weight (MW) peak observed, made by unfragmented ion. Often equal to MW of compound.

Base peak = highest absorbance peak.

Please let me know if this is unclear and refer to the picture on page 110 of EK.
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