PROBLEM TO BE SOLVED: To provide an atmospheric pressure ion source allowing the irradiation axis of excitation gas of DART to be easily aligned to an analysis object position of a sample by visual inspection. ! SOLUTION: An atmospheric pressure ion source ionizes a sample by radiating excitation particles or charged particles generated by a discharge or high electric field under atmospheric pressure. A laser light source is disposed near the ion source, the axial direction for radiating the excitation particles or charged particles is previously adjusted so that it coincides with the optical axis of a laser beam emitted from the laser light source. Thus, the ionization point of the sample can be discriminated on the basis of the point hit by the laser beam emitted from the laser light source. ! COPYRIGHT: (C)2015,JPO&INPIT
