Patent ID: 6946304

Claim:
A method of manufacturing a semiconductor device, in which a substrate to be processed is held in a process chamber and a process gas is introduced into the process chamber to perform a prescribed process on the substrate, said method comprising: measuring components of the gas in the process chamber or at least two different gases selected from the group comprising of gas in the process chamber, gas to be introduced into the process chamber and gas discharged from the process chamber and also measuring a concentration of each component of the gas or gases, at two or more positions selected from the group comprising of a position in the process chamber, a position in a gas inlet pipe and a position in a gas outlet pipe, the gas inlet pipe being connected and communicating with an interior of the process chamber and configured to introduce the process gas for use in the process, into the process chamber, and the gas outlet pipe being connected and communicating with the interior of the process chamber and configured to discharge the gas from the process chamber to outside the process chamber; and adjusting the concentration of each component of the process gas and an atmosphere in the process chamber, on the basis of values thus measured, such that an appropriate process is performed on the substrate.