Patent ID: 7626164
Filing Date: 2009-12-01
Classification: G01N

Abstract:
1. A method of scanning a substrate, the method comprising: irradiating a first electron beam onto a first scan area of the substrate resulting in an accumulation of charge on the first scan area, wherein the first electron beam is discontinuously irradiated onto the substrate in a pulse form and the first electron beam is incident at a slope with respect to a surface of the substrate; irradiating a second electron beam onto the first scan area of the substrate, so that the accumulation of charge on the substrate is discharged from the first scan area by the second electron beam; irradiating the first electron beam onto a second scan area of the substrate resulting in an accumulation of charge on the second scan area; irradiating the second electron beam onto the second scan area of the substrate, so that the accumulation of charge on the substrate is discharged from the second scan area by the second electron beam; and repeatedly performing a sequential irradiation of the first and second electron beams onto other scan areas of the substrate.