Method of etching film

A method of etching a film of a workpiece using a processing system,

• wherein the processing system includes a first processing apparatus and a second processing apparatus,
• the first processing apparatus being provided with a first chamber body including a first chamber provided therein, a stage located inside the first chamber, a gas supply part configured to supply a first gas and a second gas into the first chamber and including a flow rate controller configured to control a first flow rate of the first gas, an exhaust device configured to exhaust the first chamber, and a valve connected between the first chamber and the exhaust device, the first gas and the second gas reacting with the film to form a reaction product,
• the second processing apparatus being provided with a second chamber body including a second chamber provided therein, and a heater configured to heat the workpiece inside the second chamber,
• the method comprising:
• measuring a second flow rate of the first gas based on an increase rate of an internal pressure of the first chamber in a state in which the valve is closed and the first gas is supplied into the first chamber at the first flow rate adjusted by the flow rate controller, and configuring the flow rate controller using the measured second flow rate to provide the first gas at the first flow rate;
• supplying the second gas into the first chamber in a state where the workpiece is not mounted on the stage;
• exhausting the first chamber in the state where the workpiece is not mounted on the stage;
• supplying a mixed gas of the first gas and the second gas into the first chamber in the state where the workpiece is not mounted on the stage;
• forming the reaction product from the film by supplying the mixed gas of the first gas and the second gas into the first chamber in a state where the workpiece is mounted on the stage;
• and
• removing the reaction product by heating the workpiece having the reaction product in a state where the workpiece having the reaction product is accommodated in the second chamber.