TANDEM MASS SPECTROMETRY METHOD WITH SEVERAL ION TRAPS

摘要

A tandem mass spectrometry method with several ion traps includes generating a high-frequency trapping electric field given priority to a four poles field in a first ion trap to trap ions with multi mass-to-charge ratio, and generating a dipolar excitation electric field with a certain frequency in the first ion trap along the linear direction, which connecting the center of the first ion trap and the center of a second ion trap. The ion with a certain mass-to-charge ratio is resonated and excited and achieves relatively high amplitude of vibration along said direction in the dipolar excitation electric field. A removing pulse voltage is generated at a certain phase in the first ion trap to remove said ion with relatively high movement amplitude to the second ion trap, and ions with other mass-to-charge ratio remain in the first ion trap. The ingoing ion or other production ion is trapped by decelerating field or gas collision in the second ion trap, and is investigated and analyzed further in the second ion trap.