measurement-of-outgassing-rates-of-steels

Measurement of Outgassing Rates of Steels

Steels are commonly used materials in the fabrication of vacuum systems because of their good mechanical, corrosion, and vacuum properties. A variety of ...

POSTECH

A variety of metal vacuum systems display the celebrated 1/t pressure, namely power-law dependence on time t, with the exponent close to unity, the origin of which has been a long-standing controversy. Here we propose a chemisorption model for water adsorbates, based on the argument for fermion behaviour of water vapour adsorbed on a stainless-steel surface, and obtain analytically the power-law behaviour of pressure, with an exponent of unity. Further, the model predicts that the pressure should depend on the temperature T according to T(3/2), which is indeed confirmed by our experiment. Our results should help elucidate the unique characteristics of the adsorbed water.

Taekyun Ha

Accelerator Division,
Pohang Accelerator Laboratory,
Accelerator Division, Pohang Accelerator Laboratory

POSTECH

Measurement of Outgassing Rates of Steels

Taekyun Ha

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POSTECH

Measurement of Outgassing Rates of Steels

Accelerator Division,
Pohang Accelerator Laboratory,
Accelerator Division, Pohang Accelerator Laboratory