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Abstract

In this article we present a novel method for absolute quantification of the flux and angular distribution of a beam source for atomic hydrogen or atomic deuterium. It is based on quantitative determination of the erosion of an amorphous , hydrogenated carbon (a-C:H) film. A heated tungsten capillary serves as the radial source. Atomic hydrogen is produced in this capillary by thermal dissociation of hydrogen molecules. A large area of a-C:H film is exposed to the source at a substrate temperature of 650 K. Interaction of atomic hydrogen with the a-C:H film causes erosion. From the spatial variation of the erosion rate one can deduce the angular distribution of the impinging hydrogen atoms. This angular distribution was also measured by mass spectrometry and showed excellent agreement with the erosion profile. The absolute flux of atomic hydrogen was also determined by mass spectrometry. With the absolute flux of atomic hydrogen known from mass spectrometry, measurement of the lateral variation of the erosion rate can be directly used as a probe for absolute quantification of the angular distribution of the impinging H (D) flux.

Additional information

Authors: SCHWARTZ-SELINGER T, Max-Planck Institut f³r Plasmaphysik, EURATOM Association, Garching bei M³nchen (DE);VON KEUDELL A, Max-Planck Institut f³r Plasmaphysik, EURATOM Association, Garching bei M³nchen (DE);JACOB W, Max-Planck Institut f³r Plasmaphysik, EURATOM Association, Garching bei M³nchen (DE)
Bibliographic Reference: Article: Journal of Vacuum Science Technology A 18(3) (2000) pp. 995-1001
Availability: Journal of Vacuum Science Technology
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