Proper Stability Region of the Impulsional Mode of an Rf Quadrupole Ion Trap Mass Spectrometer

Quadrupole ion trap is widely used as an ion storage in gaseous phase and as mass spectrometer. In its classical approach, a sinusoidal voltage form is used to confine the ions in a small region. By using an impulsional voltage, on the other hand, it is possible to increase the mass spectrometer resolution so as to be applicable for separation of light isotopes. In this article we present the theoretical treatment based on the first and second ion stability region. The results show that the first stability region is more adaptable to the impulsional mode of ion trap operation.