A tuning method for electrically compensated ion cyclotron resonance mass spectrometer traps |
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Authors: | Adam M Brustkern Don L Rempel Michael L Gross |
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Institution: | 1.Department of Chemistry,Washington University,St. Louis,USA |
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Abstract: | We describe a method for tuning electrically compensated ion cyclotron resonance (ICR) traps by tracking the observed cyclotron
frequency of an ion cloud at different oscillation mode amplitudes. Although we have used this method to tune the compensation
voltages of a custom-built electrically compensated trap, the approach is applicable to other designs that incorporate electrical
compensation. To evaluate the effectiveness of tuning, we examined the frequency shift as a function of cyclotron orbit size
at different z-mode oscillation amplitudes. The cyclotron frequencies varied initially by ∼12 ppm for ions with low z-mode
oscillation amplitudes compared with those with high z-mode amplitudes. This frequency difference decreased to ∼1 ppm by one
iteration of trap tuning. |
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