. Author manuscript; available in PMC: 2014 Apr 1.

Published in final edited form as: J Am Soc Mass Spectrom. 2013 Jan 24;24(4):469–480. doi: 10.1007/s13361-012-0543-3

Table 4.

The m/z values and branching ratios of the fragment ions formed upon CAD of protonated products of addition of the THF radical (or deuterated THF radical) to the pyridine ring at the para-position, followed by loss of a hydrogen atom

Product ion	MS² fragment ions and their branching ratios

	m/z 71 (−C₅H₅N)	43%
	m/z 80 (−C₄H₆O)	54%
	m/z 122 (−C₂H₄)	3%

	m/z 77 (−C₅H₄DN)	46%
	m/z 81 (−C₄D₆O)	29%
	m/z 82 (−C₄HD₅O)	23%
	m/z 125 (−C₂D₄)	2%

	m/z 77 (−C₅H₃D₂N)	47%
	m/z 82 (−C₄D₆O)	30%
	m/z 83 (−C₄HD₅O)	21%
	m/z 126 (−C₂D₄)	2%