QUADRUPOLE MASS SPECTROMETRY DEVICE

摘要

PURPOSE:To provide a quadrupole mass spectrometry device in which ions of any mass number pass an end field effectively to provide the maximum transmission ratio at a quadrupole electrode incidental part to ions of a wide range of mass numbers by changing a differential potential at the electrode incidental part into the optimum size in accordance with the mass number of the ions subjected to mass spectrometry. CONSTITUTION:Based on a mass scan signal from an electrode voltage control part 5, a main power source 2 applies a combined voltage of a DC voltage U with a high frequency voltage Vcosomegat is applied to a quadrupole electrode 1. An incidental part potential difference control part 6 inputs the mass scan signal, and controls a voltage at a shield case 9 and a lens electrode 8 through an incidental part differential potential power source 7 based on a table of the optimum differential potential at the incidental part to a preliminarily inputted mass number of ions.