Dark spot in SEM image

Salman Latif slatif at stanford.edu
Sun Oct 19 20:36:42 PDT 2008

I keep seeing a black spot in the center of the SEM image. If you zoom in, it grows to fill the whole viewing area. The spot goes away if I change the acceleration voltage, but is always present for an acceleration voltage of 10 KV (the aperture size doesn't matter). I am not comfortable doing an exposure with this spot in the image, so I am cancelling my session and releasing the reservation (which was till midnight tonight). 


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