Patent ID: 7894059

Claim:
A film formation processing apparatus comprising: a chamber configured to be evacuated and to perform therein a film formation process on an object to be processed; a gas introduction opening, which is connected to a cleaning gas source that supplies cleaning gas for a cleaning process to remove unnecessary film formed in the chamber; an exhaust pipe connected to the chamber to exhaust gas from inside the chamber; and a particle measuring device connected to the exhaust pipe and configured to measure a number of particles contained in exhaust gas flowing through the exhaust pipe, the particle measuring device including a laser beam irradiator configured to emit a laser beam to the exhaust gas flowing through the exhaust pipe, and a scattered light detector configured to detect scattered light from particles contained in the exhaust gas irradiated with the laser beam; and cleaning end-point determination means for determining an end-point of the cleaning process, with reference to a decrease in the number of particles measured by the particle measuring device during the cleaning process.