Strategies for Modifying a Triple Quadrupole Mass Spectrometer for Digital Operation in Higher-Order Mathieu Space Stability Zones

The filtering and analyzing quadrupoles of a commercial triple quadrupole mass spectrometer were modified for digital operation by replacing the sinusoidal RF drivers with high-precision digital waveform drivers. This modification enables access to higher-order Mathieu-space stability zones (i.e., zones (3,1) and (3,2)) through duty-cycle manipulation of the digital waves. To facilitate this modification, secondary digital waveforms were added to the short rods preceding the analyzing quadrupole to enhance ion transmission. These modifications provide a tractable means to expand the operating parameters and potentially the m/z range of commercial triple quadrupole systems.