Ion transmission and ion/molecule separation using an electrostatic ion guide in chemistry ionization mass spectrometry |
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| Affiliation: | 1. Cooperative Institute for Mesoscale Meteorological Studies, University of Oklahoma, and NOAA/OAR National Severe Storms Laboratory, Norman, OK, USA;2. Department of Atmospheric Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel;3. Department of Atmospheric Sciences, Texas A&M University, College Station, TX, USA;4. Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA;5. NOAA/OAR National Severe Storms Laboratory, Norman, OK, USA |
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| Abstract: | The performance of an electrostatic ion guide for use in chemical ionization mass spectrometry is evaluated. The study focuses on the use of the ion guide to extract charged particles in a rapidly expanding beam consisting of ions and neutral molecules. A theoretical analysis of this system is presented, using three-dimensional calculations of the trajectories of ions. Laboratory measurements verifying the theoretical calculations are also reported. The results illustrate the two principal advantages for this system: efficient 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 transporting charged particles from a diverging ion source. |
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