An Improved Ion Guide for External Ion Injection in Glow Discharge-Fourier Transform Ion Cyclotron Resonance (GD-FTICR) Mass Spectrometry
Technical rept. Jan-Dec 1991
FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
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To improve the existing ion transport optics of our glow discharge-Fourier transform ion cyclotron resonance GD-FTICR mass spectrometer, we have simulated several ion trajectories between the glow discharge source region and the ICR analyzer cell. These calculations suggested that a number of simple improvements, including the use of an ion flight tube and an electrically isolated conductance limit, would increase the efficiency of ion transfer through the fringing fields of the FTICR superconducting magnet and into the ICR analyzer cell. Ion beam intensity was monitored before and after implementing these improvements as a function of the distance between the glow discharge source and the analyzer cell. A twenty-fold improvement in the transport efficiency, as well as a significant enhancement in detected FTICR signals, was observed.
- Atomic and Molecular Physics and Spectroscopy