I always understood nothing there, the colours produced from interference effects from surface, similar mechanism to rainbows you see on oily puddles (but no oil) Regards Mike Fenner Indium Corporation ----- SMART European Conference UK, 16-18 November 2004 www.smartgroup.org/con2004/conference2004.pdf -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ingemar Hernefjord (KC/EMW) Sent: Wednesday, October 20, 2004 3:57 PM To: [log in to unmask] Subject: [TN] Argon plasma cleaning Great silence at TN, or my box may miss the postings..anyway...here I have a topic about plasma cleaning. The aluminium trays, on which we place the ceramic substrates and other stuff for cleaning, they sometimes get discolored spots, blue, violet, brown, black. Most of these patterns occur along the edges. In light microscope you can see that parts of the aluminium is etched. The trays lay on a perforated stainless steel shelf that can be pushed in/out. There are numbers of such shelves in the chamber. As the homogenous stainless steel door is closed during operation, I can't see how the plasma works. I suspect that there are 'corona' lines, that bombard in concentrated areas and digs out the aluminium slowly atom by atom. Q1: anyone who recognizes this? Q2: what material is best as trays? Q3: does the aluminium redeposit on the boards for cleaning? (don't think so myself) Q4: what's best 'furniture' in the plasma chamber for spreading the argon ions best way? Ingemar Hernefjord Ericsson Microwave Systems --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ::::::::::::::::::::::::::: This email, its content and any files transmitted with it are intended solely for the addressee(s) and may be legally privileged and/or confidential. If you are not the intended recipient please delete and contact the sender by return and delete the material from any computer. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. Messages sent via this medium may be subject to delays, non-delivery and unauthorized alteration. This email has been prepared using information believed by the author to be reliable and accurate, but Indium Corporation makes no warranty as to accuracy or completeness. In particular, Indium Corporation does not accept responsibility for changes made to this email after it was sent. Any opinions or recommendations expressed herein are solely those of the author. They may be subject to change without notice. ::::::::::::::::::::::::::: --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------