Patent ID: 9091595
Filing Date: 2015-07-28
Classification: G01J,H01J

Abstract:
1. An analysis method comprising: measuring a light emission within a chamber during etching processing of a semiconductor wafer; obtaining first time-based fluctuations on each wavelength of light emitted from a pre-identified substance due to changes over time in a measured intensity of the light emissions within the chamber; obtaining second time-based fluctuations on each peripheral wavelength that is a wavelength at a predetermined distance from the wavelength of the light emitted from the pre-identified substance due to changes over time in the measured intensity of the light emissions within the chamber; calculating a first correlation value which is a correlation value between the first time-based fluctuations on each wavelength of the light emitted from the pre-identified substance due to changes over time in the measured intensity of the light emissions within the chamber; calculating a second correlation value which is a correlation value between the first time-based fluctuations and the second time-based fluctuations on each wavelength; and identifying a wavelength indicating light emitted from a substance contained in a plasma within the chamber by using the first and second correlation values.