Patent ID: 8704194
Filing Date: 2014-04-22
Classification: H01J

Abstract:
1. An information acquiring apparatus for acquiring information relating to the mass of a constituent of an object on a substrate by means of mass spectrometry, the apparatus comprising: a mechanism for converging and pulsing a primary beam selected from an ion beam, a neutral particle beam and a laser beam and irradiating the converged and pulsed primary beam onto the object on the substrate; a control electrode arranged in a conical region for applying a backward force to flying charged particles generated by the irradiation of the primary beam, the conical region having a vertex at a central point and a rotation axis disposed in axial symmetry with a primary beam axis with regard to a central axis and diverging from the vertex with an angle of 30° relative to the rotation axis, where the primary beam axis is a trajectory of the primary beam, the central point is a point of intersection of the trajectory of the primary beam and a surface of the object, and the central axis passes the central point and is disposed normal to the substrate; and an extraction electrode arranged above the substrate for mass spectrometry, wherein the control electrode is configured to generate an electric field for applying the backward force in a direction generally parallel to the rotation axis.