SEM lab week

1
SEM lab week 2 1999 ASTIGMATISM APERTURE
CENTERING ON THE AMRAY 1400 SPOT SIZE (CONDENSOR
LENS STRENGTH) SETTINGS Images were not
collected for the astigmatism and aperture
centering part of this lab. Good examples of
what we saw for astigmatism are given on page 58
of the book.
2
Spot size 3
Spot size 4
Spot size 5
Spot size 6
3
Spot size 9 w/ brightness adjustment (less
signal/noise)
Spot size 1 w/ brightness adjustment
4
Same thing w/ better signal/noise because 256
frames were averaged instead of 32
Spot size 9 (noisy)