Fwd: [RASMB] Sapphire windows

[Dr Lyle Carrington]

>Hi Kristian

Have you tried scanning the windows, rotating a small angle then 
scanning again and repeating this until you have done  360 degrees. 
This is a lot of trouble but you might find one or more sweet spots 
in the windows. We purchase our windows from Victor Kyburz AG in 
Switzerland and do not seem to have your problem.

Cheers

Lyle Carrington





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>From: Kristian Schilling <schilling at nanolytics.de>
>Subject: [RASMB] Sapphire windows
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>Hi all,
>
>I would like to get rid of some Sapphire windows, I am willing to 
>sell them at 80 EUR per piece. Here's why:
>
>We have been using Sapphire windows ever since because we have 
>interference optics. However, we were never quite happy with the 
>windows in question because they have significant fringe noise. It's 
>mostly somewhere in the range between one fringe and half a fringe 
>over that one cm we register.
>
>Of course one can aquire a blank scan at the beginning of the 
>experiment and subtract the time invariant noise from all subsequent 
>scans, but it has turned out we rather use those cells all the time 
>where the windows are better... Just to say you *can* work yourself 
>around with these windows.
>
>The fringe noise is due to inhomogenities inside the sapphire 
>material. It will not influence the results of absorbance 
>measurements, however, it is not recommended to use sapphire for 
>measurements below 235 nm.
>
>The windows are not Beckman originals but are geometrically 
>identical, and they look exactly the same. I bought them directly 
>from a Sapphire company but it turned out only one out of three were 
>really satisfactory. I will try out other materials and sources and 
>would like to do so until the end of the year, but for that I will 
>need some cash, so here goes...
>
>I have placed typical interference scans of a "good" and a "bad" 
>window at the following link for illustration: 
>http://www.nanolytics.de/scientific/sapphire.pdf
>
>Best wishes,
>Kristian
>
>
>
>=================================
>Nanolytics
>Gesellschaft fuer Kolloidanalytik mbH
>Dr.  Kristian Schilling
>
>Hauptstr. 20
>D-14624 Dallgow
>
>Tel.:		+49/3322/24200-5
>Fax:		+49/3322/24200-6
>e-mail:	schilling at nanolytics.de
>Internet:	www.nanolytics.de
>
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Dr Lyle Carrington
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