raith issues?

Charis Quay Huei Li chquay at MtHolyoke.edu
Sat Aug 7 01:01:06 PDT 2004

(1) beam drift/settling right after beam is unblanked, same as has been
seen before. several hundred nm.

(2) stigmation varies from place to place on sample by several %.

(3) focus also drifts over time.

problem (3) could be due to the fact that i'm using carbon dots but i've
bever seen (2) when i'm not near a clip. what was the problem the last
time we saw (1)?


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