Patent ID: 8450681
Filing Date: 2013-05-28
Classification: H01J

Abstract:
1. A method of changing a baseline offset of a charged particle analyzer, comprising: varying at least one of a pressure or a gas composition within a charged particle source; receiving a flow of particles from the charged particle source into a flow region defining a first end and a second end, at a first site of the first end of the flow region; applying at least a first voltage to a first electrode assembly disposed relative to the first end and a second voltage to a second electrode assembly disposed relative to the second end to optimize transmission of the received flow of particles from the first site along a flow path towards a second site of the second end of the flow region, wherein the first site and the second site are spaced from an axis extending from the first end to the second end of the flow region, and the second site is positioned such that a sightline from the first end to the second end parallel to a direction of the flow of particles at the first site does not intersect the second site; and generating a spectrum based on collected charged particles.