CCD-world: Re: cleaning

[Peter Conroy]

The following was posted to CCD-world:

Dear Byeong

We used.

Petroleum Spirit - Boiling Range 40-80C
AJAX Chemicals - Univar analytical reagent (very pure).
Alo buy a plastic squeeze wash bottle with a fine jet.
We purchase from a local cmemical lab supplier.

Pet Spirit is very volatile and will dry quickly, in fact the leading edge
of the  film will dry as it flows down the vertical surface of the chip. It
is also VERY flammible, stay well away from naked flames and sparks, work
under a fume hood. Aim the fine jet of spirit at the chip surface and not
at the bond wires, the film will spread out and clean the bond wires
without being directly hit by the jet. When the vertical chip surface is
dry turn the package face down and the pet spirit caught in the corner of
the chip package should drop out. Washing the chip with pet spirit will
cool it so you will need to let it warm up for five minutes between each
wash cycle or you will cool the chip below the local dew point and warter
will condense on the chip surface. We have found that water will
permamantly damage the thin coating on SITe thinned CCD. 

PRACTICE FIRST on a setup grade or dead CCD.

I have tried to clean chips in the past with Isopropol alcohol and a stream
of dry nitrogen   I managed to break the bond wires while blowing the drops
of alcohol around. 

Regards

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>I think the situation you described is very similar to 
>my case. Since you use similar kind of turbopump 
>as mine, I guess the oil could be the same. My plan now is to assemble the
>camera, evacuate 
>and fill LN2 and then take flat on it. I wonder what the 
>image looks like. The process will be done by another 
>guy during my vacation. After that, I want to try your 
>method which seems to be very simple way. Before trying, I hope to
>understand more from yor mail. 
>Because my English is not so fluent, some terms are 
>not familiar, thus the meanings are not clear to me. 
>First, I don't understand what you mean by "reagent 
>grade petroleum spirit" and "the pet spirit". Can I buy 
>the former sovent in a gas station, or oil shop nearby? 
>Second, is there any post-process to remove the solvent, 
>or is the solvent fairly volatile and I do not need anything 
>to do after washing? Thanks, 
>Byeong-Gon 


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Mr Peter Conroy

Mt Stromlo Observatory    The Australian National University
Private Bag   Weston Creek PO  ACT 2611 AUSTRALIA

Phone (W) 61 2 6279 8022
Fax 61 2 6249 0233
Email conroy at mso.anu.edu.au
http://www.mso.anu.edu.au/~conroy
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