Patent ID: 7095035
Filing Date: 2006-08-22
Classification: B82Y,H01J

Abstract:
1. A method for measuring a demagnification of a charged particle beam exposure apparatus, the method comprising: measuring a first stage position of a mask stage of the charged particle beam exposure apparatus in accordance with a mask stage coordinate system having a measurement accuracy of an order of 1 nm with an opening portion of a mask placed on the mask stage being situated in a first opening position; irradiating a first charged particle beam to a first irradiation position on a surface of a specimen through the opening portion of the mask, the first charged particle beam being shaped through the opening portion and then passing through an objective lens system; measuring the first irradiation position in accordance with a specimen stage coordinate system having a measurement accuracy of 1 nm; moving the mask stage to a second stage position to situate the opening portion of the mask in a second opening position different from the first opening position by a distance of an order of several hundred μm; measuring the second stage position of the mask stage in accordance with the mask stage coordinate system; irradiating a second charged particle beam to a second irradiation position on the surface of the specimen through the opening portion of the mask moved together with the mask stage, the second charged particle beam being shaped through the opening portion situated in the second opening position and then passing through an objective lens system; measuring the second irradiation position in accordance with the specimen stage coordinate system; and calculating a demagnification η of the charged particle beam exposure apparatus from a distance L between the first and second stage positions and a distance 1 between the first and second irradiation positions using an equation η=1/L.