Why are a3 ions rarely observed?

@article{Allen2008WhyAA,
  title={Why are a3 ions rarely observed?},
  author={Julia Marie Allen and Alawee H. Racine and Ashley Mitchell Berman and Jeffrey S. Johnson and Benjamin J Bythell and B{\'e}la Paizs and Gary L Glish},
  journal={Journal of the American Society for Mass Spectrometry},
  year={2008},
  volume={19},
  pages={1764-1770}
}
It has been determined experimentally that a3 ions are generally not observed in the tandem mass spectroscopic (MS/MS) spectra of b3 ions. This is in contrast to other bn ions, which often have the corresponding an ion as the base peak in their MS/MS spectra. Although this might suggest a different structure for b3 ions compared to that of other bn ions, theoretical calculations indicate the conventional oxazolone structure to be the lowest energy structure for the b3 ion of AAAAR, as it is for… CONTINUE READING
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