Patent ID: 6448554
Filing Date: 2002-09-10
Classification: H01J

Abstract:
An ion scattering spectrometer in which an ion beam generated at an ion source is accelerated by an accelerator to irradiate a sample placed in a sample chamber, and particles scattered from the sample are measured by a detector, the spectrometer comprising:gas introducing means for introducing a gas into the sample chamber for treating the sample; first exhaust means for exhausting the sample chamber to make in the sample chamber, an atmosphere of the gas of a reduced pressure; an orifice disposed between the sample chamber and the detector to separate a first region including the detector from the sample chamber, the orifice passing both the ion beam that irradiates the sample and the particles that are scattered from the irradiated sample to reach the detector; and second exhaust means for exhausting the first region to make the first region have a higher vacuum than a vacuum of the sample chamber; wherein: the detector includes a center hole for passing the ion beam toward the sample; and the detector's center hole, the orifice, and the sample are aligned such that the ion beam that is irradiated toward the sample, and the scattered particles that are scattered from the sample, have a same axis.