High-Resolution Mass Spectrometry with a Multiple Pass Quadrupole Mass Analyzer

摘要

The peak shape narrows and the resolution improves if the ions are simply reflected back and forth through a conventional quadrupole mass analyzer. CO↑(+) and N↓(2)↑(+) at M/z = 28 are separated to 50% valley with half of the original signal remaining. These two ions can be resolved to baseline (m/Δm) = 5000 with 1% of the original signal remaining.