| 摘要 |
PURPOSE:To prevent a strong current from flowing in a detector and to protect the detector from deterioration, by making either a high-frequency voltage or a DC voltage deviate from a specific relation, and avoiding to detect a background peak, at the point where the background peak exists. CONSTITUTION:In a scanning method of a quadruple mass spectrometer, either a DC voltage or a high-frequency voltage which is applied to a rod is made to deviate from a specific scanning condition at the point where a background peak exists. And the scanning line is made to detour and deviate from the stable area of the background component ions with a strong peak, and the detection of the peak current is avoided. Therefore, the deterioration of a detector such as a secondary electron multiplier owing to a large ion current of an unnecessary background component can be prevented, and the service life of the detector is improved. |
