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Optimization of the etching parameters of the ion milling milling etching two approaches are exploited The first one is to vary the incident angle of the Argon etching beam with the sample removing by etching part of the redeposited material gather on the sidewalls The angle between beam and sample surface ranges from 40¼ 90¼.CHEMICALLY ASSISTED ION BEAM ETCHING FOR Using a two component gas system of argon and xenon difluoride vapor under various operating conditions the etched wall profiles of Si were found to be controllable In the reactive ion beam etching mode of operation overcut profiles with enhanced etch rates over ion milling rates were produced from Ar plus and XeF//x plus beams resulting

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