Abstract
[Display omitted]
► Potential field distribution of a quadrupole mass filter with circular cross-section electrodes is described. ► Using superposition principle, we calculate potential around a round rod which is subjected to a given potential. ► By standard separation method, we obtain the potential distribution into the quadrupole mass filter with circular rods. ► Same equivalent operating point in two stability diagrams (having the same
β
y
) the associated modulated secular ion frequencies behavior are the same.
Potential field distribution of a quadrupole mass filter with circular cross-section electrodes is described. At first, using superposition principle, we calculate potential around a round rod which is subjected to a given potential. By standard separation method, we then able to obtain the potential distribution into the quadrupole mass filter with circular rods. The results are compared with those obtained with a conventional hyperbolic rod set. Also, the results show that, for the same equivalent operating point in two stability diagrams (having the same
β
y
) the associated modulated secular ion frequencies behavior are the same.