Ry. Zhang et al., Ion transmission and ion/molecule separation using an electrostatic ion guide in chemistry ionization mass spectrometry, INT J MASS, 194(1), 2000, pp. 41-48
The performance of an electrostatic ion guide for use in chemical ionizatio
n mass spectrometry is evaluated. The study focuses on the use of the ion g
uide to extract charged particles in a rapidly expanding beam consisting of
ions and neutral molecules. A theoretical analysis of this system is prese
nted, using three-dimensional calculations of the trajectories of ions. Lab
oratory measurements verifying the theoretical calculations are also report
ed. The results illustrate the two principal advantages for this system: ef
ficient ion transmission and ion-neutral molecule separation. A comparison
between the ion guide and the commonly used electrostatic ion lenses shows
that the ion guide is significantly more efficient in capturing and transpo
rting charged particles from a diverging ion source. (C) 2000 Elsevier Scie
nce B.V.