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The liquid supply system comprises a pump for delivering a liquid under high pressure and a vaporizer for vaporizing the liquid delivered from the pump. The liquid vaporized in the vaporizer is supplied to a reaction chamber. A pressure gage is provided in a passage extending from the pump to the va

The liquid supply system comprises a pump for delivering a liquid under high pressure and a vaporizer for vaporizing the liquid delivered from the pump. The liquid vaporized in the vaporizer is supplied to a reaction chamber. A pressure gage is provided in a passage extending from the pump to the vaporizer. A monitor device is provided so as to indicate a pressure, based on an output of the pressure gage.

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1. A liquid supply system comprising: a first pump for delivering a liquid under high pressure; a vaporizer for vaporizing the liquid delivered from said first pump to thereby obtain vapor, with the vapor being adapted to be introduced into a reaction chamber; a solvent supply system for supply

1. A liquid supply system comprising: a first pump for delivering a liquid under high pressure; a vaporizer for vaporizing the liquid delivered from said first pump to thereby obtain vapor, with the vapor being adapted to be introduced into a reaction chamber; a solvent supply system for supplying a solvent for cleaning or a cleaning liquid, with said solvent supply system including a second pump for delivering the solvent or the cleaning liquid under high pressure, a gas supply system for supplying a gas, with said gas supply system including a flow rate controller for controlling the flow rate of the gas; a passage for introducing the solvent or the cleaning liquid from said second pump into said first pump and said vaporizer so that said first pump and said vaporizer become filled with the solvent or the cleaning liquid; and a passage for introducing the gas from said flow rate controller into said first pump and said vaporizer such that the gas mixes with the solvent or the cleaning liquid to form gas bubbles, whereby said first pump and said vaporizer are cleaned in response to vibrations resulting from impulses due to the gas bubbles. 2. A method for cleaning a liquid supply system, the liquid supply system including a first pump for delivering a liquid under high pressure and a vaporizer for vaporizing the liquid delivered from the first pump to thereby obtain vapor, with the vapor being adapted to be introduced into a reaction chamber, said method comprising: introducing a solvent or a cleaning liquid into said first pump and said vaporizer so that said first pump and said vaporizer become filled with said solvent or said cleaning liquid; and introducing a gas into said first pump and said vaporizer through a flow rate controller such that the gas mixes with the solvent or the cleaning liquid to form gas bubbles, whereby said first pump and said vaporizer are cleaned in response to vibrations resulting from impulses due to the gas bubbles.