The MP0 ion optics transmits ions from the MP00 ion optics to the first quadrupole (Q1). The MP0 ion optics includes a MP0 multipole, lenses TK1 and TK2, and a neutrals blocker.
The MP0 multipole is an array of square-metal rods that transmit ions. The MS applies an RF voltage to the rods to generate an electric field that guides the ions along the axis of the multipole. The MP0 DC offset voltage increases the translational kinetic energy of the ions as they leave MP00. The RF voltage causes the charged ions to follow the curve of the rods. Neutral species do not follow the curve; instead, they strike the neutrals blocker and are removed from the beam.
The TK1 and the TK2 lenses are metal disks with a circular hole in the center through which the ion beams passes. They act as a two-element cone lens. The MS applies an electrical potential to the lens to accelerate (or decelerate) ions as they approach each lens. The TK1 and TK2 lenses are also a vacuum baffle between multipole MP0 and quadrupole Q1.