Journal
JOURNAL OF APPLIED PHYSICS
Volume 89, Issue 9, Pages 5227-5229Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1355694
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In this article, we report results on mass spectrometric investigation of the positive ions created in a low-pressure radio frequency helicon plasma reactor using oxygen/tetraethoxysilane (O-2/TEOS) and argon/tetraethoxysilane (Ar/TEOS) mixtures. It is shown that the variety of ions is much greater in the Ar/TEOS plasma than in the O-2/TEOS plasma. In the case of the Ar/TEOS plasma, ions are observed up to 343 amu whereas in the case of the O-2/TEOS plasma, ions are observed up to 211 amu. Ion/molecule reaction rates between TEOS parent positive ions and neutral TEOS molecules are considerably less important in the O-2/TEOS plasma as compared with the Ar/TEOS plasma. Using the values of the TEOS dissociation degree measured for O-2/TEOS and Ar/TEOS plasmas, the observed ion/molecule reactions might be explained by the higher concentration of TEOS molecules in the Ar/TEOS plasma.
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