Patent ID: 6943053

Claim:
A method of spectroscopically modeling a semiconductor manufacturing process, the method comprising the steps of: (1) conducting a plurality of semiconductor manufacturing process runs, wherein at least one of a plurality of process parameters is changed from its target value; (2) collecting spectral data indicative of light emitted by plasma during each of said plurality of semiconductor manufacturing process runs; (3) formulating a ratio based on a relationship between the collected spectral data and the change in the at least one of the plurality of process parameters; (4) conducting at least one center point process among said plurality of semiconductor manufacturing process runs by setting all of the plurality of process parameters thereof to their target values; and (5) conducting at least one one-parameter changing process among said plurality of semiconductor manufacturing process runs by setting one process parameter to change from its target value by a predetermined value, wherein said predetermined value is plus or minus 10% of a target value.