Controlled Dosing of Molecular Vapors into Ultra-High Vacuum

Additional Funding Sources

This project is supported by the American Chemical Society Project SEED Program.

Abstract

In order to study the behavior of surface-bound molecules used in atomic layer deposition, it is necessary to be able to deliver finely controlled doses of chemical precursor vapors into an ultra-high vacuum (UHV) system containing a pristine sample surface. To enable controlled precursor dosing, an ballast chamber was constructed. The ballast chamber is capable of holding a precursor vapor at a specific pressure combined with a computer controlled valve that allows dosing of a fixed amount of gas into the UHV chamber. Here, the design and construction of the ballast chamber is discussed.

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Controlled Dosing of Molecular Vapors into Ultra-High Vacuum

In order to study the behavior of surface-bound molecules used in atomic layer deposition, it is necessary to be able to deliver finely controlled doses of chemical precursor vapors into an ultra-high vacuum (UHV) system containing a pristine sample surface. To enable controlled precursor dosing, an ballast chamber was constructed. The ballast chamber is capable of holding a precursor vapor at a specific pressure combined with a computer controlled valve that allows dosing of a fixed amount of gas into the UHV chamber. Here, the design and construction of the ballast chamber is discussed.