Subject: Dark spot in SEM image
From: Salman Latif <slatif@stanford.edu>
Date: Sun, 19 Oct 2008 20:36:42 -0700 (PDT)

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).


Salman.