Question #c29ad

1 Answer
Jan 4, 2017

Are you asking why the molecular ion is not the most intense peak in the mass spectrum?


When a mass spectrum is acquired, some not little effort may be applied to the experiment so that the molecular ion is observed. A modified method of ionization, a modified method of sample introduction or preparation, may have to be employed.

In the mass spectrometer, the ions are high energy species that may rearrange, or may not even appear at all. And thus the most intense peak in the observed mass spectrum MAY NOT be the molecular ion. Of course, the spectroscopist attempts to get the molecular ion, but the attempt may not always succeed.

If I have missed the point of your question, I and others are willing to try again.