Mathieu stability diagram

synonym: stability diagram
https://doi.org/10.1351/goldbook.12486
Graphical representation expressed in terms of dimensionless reduced coordinates that describes the stability or instability of charged particle motion in a transmission quadrupole mass spectrometer or Paul ion trap, based on an appropriate form of the Mathieu differential equation.
Source:
PAC, 2013, 85, 1515. (Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)) on page 1566 [Terms] [Paper]