Improving the quality of the ion beam exiting a quadrupole ion guide |
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Authors: | Vadym D. Berkout Vladimir M. Doroshenko |
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Affiliation: | MassTech, Inc., Columbia, Maryland, USA. bberkout@apmaldi.com |
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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. |
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