Office of Technology Transfer – University of Michigan

Multi-Resonant Circuit for Quadrapole Mass Spectrometry

Technology #4867

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Daniel Gershman
Managed By
Joohee Kim
Licensing Specialist, Physical Sciences & Engineering 734-764-8202
Patent Protection
US Patent Pending

We have created a novel circuit to drive mass spectrometry and ion trap systems with multiple frequencies in a concurrent matter. This enables substantially enhanced performance of said systems, while using the same sensors. The methodology developed here enables two-pole or symmetric three pole multi-resonant tank circuits. We achieve this, using a network of capacitors and inductors which are combined through a novel method for selecting component values and tuning procedures based on a desired spacing of frequency poles and load capacitances. The resulting circuit constitutes a substantial enhancement over the currently existing state of the art. Previously, amplitude modulation has been done at frequencies near the primary quadrupole RF frequency. This modulation results in increased abundance sensitivity and improved resolution of existing quadrupole systems. We enable auxiliary excitation and/or amplitude modulation of the quadrupole driving signal at frequencies far away from the fundamental RF frequency using our multi-resonant circuit. This allows for more robust selection of a system operating point and increased power efficiency.