Patent ID: 9312116
Filing Date: 2016-04-12
CPC Classification: G01N,H01J

Claim Text:
1. A mass distribution spectrometry method including irradiating a sample with a primary ion beam and detecting a generated secondary ion, wherein the primary ion beam having a spread toward a direction perpendicular to a travelling direction is obliquely incident on a surface of the sample after a path length of each primary ion contained in the primary ion beam is adjusted by deflecting a trajectory between a primary ion source and the surface of the sample, wherein the mass distribution spectrometry method is a projection type mass distribution spectrometry method, and wherein path lengths of primary ions incident on arbitrary two points on the surface of the sample on which the primary ions are incident are adjusted so that: a difference of the path lengths of the primary ions incident on the two points becomes smaller than d*cos θ, when d is defined as a distance in an incident direction of the ion beam between the arbitrary two points which have been projected on a horizontal plane on the surface of the sample, and θ is defined as an incident angle of an ion which is incident on either one of the points out of the two points.