Skip to main content
. Author manuscript; available in PMC: 2006 Mar 10.
Published in final edited form as: Anal Chem. 1998 Mar 1;70(5):179A–185A. doi: 10.1021/ac981773x

Figure 1. Schematic of an external ion-source FTMS instrument.

Figure 1

Electrospray ions generated at atmospheric pressure are guided through five differential pumping stages and into the ion cell at 10−9 Torr by means of an electrostatic ion guide system. Neutral atoms or molecules are introduced through the leak or pulsed valves for collisional activated dissociation or ion-molecule reactions; photodissociation occurs with lasers or blackbody photons from the heated vacuum chamber.