Hi all,

will send a picture to Steve for getting help.
Thermosonic 25um gold balls don't stick to the thinfilm gold on a optic chip.
2,500A Au over 400A Cr. Bad yield, many balls lift. No contaminations found.
Despite I have the good fishbone, I can't find out why the odd pattern under lifted bals.
A guess is that the capillary have to steep chamfer angle, so that the U/S mechanical energy
becomes concentrated in the middle. Anyone with similar experience?

Inge

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