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Date: 06/12/02 at 10:18 PM
Posted by: Pat McMahon
E-mail: film.vac@verizon.net

In Reply to: Darkness control of Cr coated glass posted by Lee,Choong Sang on 06/12/02 at 2:30 AM:

Dark Cr films are usually caused by oil contamination. Check that your rough pump is operating correctly and that oil vapors from it are properly trapped.

Consider a liquid nitrogen trap for your diffusion pump.

Best of luck.

Pat

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