Patent ID: 8207512
Filing Date: 2012-06-26
Classification: H01J

Abstract:
1. A method for measuring distribution of beam landing angles with a viewing field by use of a charged particle beam apparatus, the method comprising the steps of: imaging a test sample with a first magnification ratio sufficient for including polyhedral patterns formed a test sample within a viewing field by applying a charged particle beam to the test sample and by detecting secondary electrons generated from the test sample, the polyhedral patterns having a known shape; imaging each polyhedral patterns with a second magnification ratio which is higher than the first magnification ratio by sequentially moving and applying the charged particle beam; obtaining first relationships between a position irradiated with the charged particle beam within the viewing filed and the beam landing angle for each the polyhedral patterns using images obtained during the step of imaging each polyhedral pattern; and obtaining second relationships between other positions within the viewing field and beam landing angles through interpolation.