🚀 go-pugleaf

In article <43886@ogicse.ogi.edu>, milts@mse.cse.ogi.edu (Milt Scholl) writes:
|> Actually we are in the process of putting a 1024X1024X24 bit camera
|> in our 200 KV hitachi.  You can do it two ways a camera with an
|> axis parallel to the beam looking down at the phosphor screen (but
|> there are problems with stray electrons, x-rays in the column) or,
|> as we are doing, using a ccd camera specifically made to fit in
|> the column and intersect the beam with the detector.  There is a
|> device of some type between the ccd and the beam, so you don't get
|> 200 kv electrons zipping through the ccd - electrons go REAL far in
|> silicon and other semiconductors.  I believe we are getting the
|> camera from GATAN.

yes, but you're still converting to light- the original posters were
wanting to blow off the scintillator and just capture the electrons which,
as you said, would penetrate far into Si and probably fry things very nicely.

Out of curiousity, since the phosphor screen produces around a single 
wavelength (660nm?), why are you using a (presumably) color camera w/ 
8-bit for RGB (=24bit)?  or do you have multiple screens and are using
multiple magnetic prisms and looking for different compounds simultaneously
or something else radical?

						kevin

ps: BTW, have heard Bad Things about Gatan's quality and support...