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The extension of nitrogen rule to even-electron ions ([1], p. 38). Note that the N rule is only applicable for singly charged ions containing solely H, C, N, O, Hlg, P and S atoms and is only reliable < m/z 500 [28].
| Odd m/z | Even m/z | |
|---|---|---|
| OE 1 | odd #N | even #N |
| EE 2 | even #N | odd #N |
1 odd-electron precursor/fragment ion. 2 even-electron precursor/fragment ion.
