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. Author manuscript; available in PMC: 2009 Feb 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2007 Nov 1;19(2):173–189. doi: 10.1016/j.jasms.2007.10.018

Figure 7.

Figure 7

Side-view instrument schematic of a quadrupole ion trap that combines electrospray ionization and in situ ionization effected by injection of electrons through the ring-electrode. Reprinted from reference [17] with permission from John Wiley & Sons Ltd., copyright 1998.