Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1196591 | Journal of the American Society for Mass Spectrometry | 2006 | 6 Pages |
Abstract
The effect of fringing fields on the divergence of the ion beam exiting an RF quadrupole ion guide was studied using a computer simulation. It was shown that reducing the strength of the RF field towards the ion guide exit reduces ion beam divergence. Further improvement was demonstrated when creating a DC gradient towards the exit. The results of the numerical simulation were verified experimentally using a time-of-flight (TOF) mass analyzer with orthogonal acceleration. Decreasing the ion beam divergence resulted in considerably improved mass resolution of the instrument.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Vadym D. Berkout, Vladimir M. Doroshenko,