Patent ID: 6383402
Filing Date: 2002-05-07
Classification: G01J

Abstract:
A method for monitoring a plasma process in a processing chamber, said method comprising the steps of:executing a first plasma process within said processing chamber; obtaining optical emissions data throughout a first wavelength region having a first bandwidth during said first plasma process; selecting a second wavelength region having a second bandwidth, wherein said second bandwidth is less than said first bandwidth, wherein said second wavelength bandwidth is at least 50 nanometers, and wherein said second wavelength region is totally contained within said first wavelength region; monitoring a first aspect of said: first plasma process using a first portion of said optical emissions data from said obtaining step associated with said first plasma process, said first portion of said optical emissions data being limited to said second wavelength region, wherein said monitoring step comprises comparing said first portion of said optical emissions data with optical emissions data from a prior execution of the same said first plasma process in the same said processing chamber.