Patent ID: 9613787
Date: 2017-04-04
CPC Classifications: H01J

Claim:
1. A time-of-flight mass spectrometer conducting a mass analysis by providing a predetermined amount of kinetic energy to an ion to make the ion fly in a flight space, comprising: a flight chamber having the flight space in which an ion having a smaller mass-to-charge ratio flies at a higher speed than an ion having a larger mass-to-charge ratio, and a flight time required for an ion to fly through the flight space is measured and a mass-to-charge ratio of the ion is determined based on the flight time; a gas introduction member for introducing predetermined gas into at least a part of the flight space where ions are separated according to their flight time both in a condition that the gas is not introduced and in a condition that the gas is introduced; a control member for executing a mass analysis on a same sample both in a condition that the gas is not introduced and in a condition that the gas is introduced by the gas introduction member, respectively, and obtaining respective time-of-flight spectra from each mass analysis executed in the two conditions; and an ion identification member for identifying each ion among various kinds of ions having a same m/z value by making a comparison on at least one of a position, shape, or strength of peaks appearing in two time-of-flight spectra obtained under the control of the control member.