Calibration, Maintenance, Troubleshooting and Warranty
Calibration of “A” Scanners for Atomic-scale Measurement
Rev. B
MultiMode SPM Instruction Manual
307
3. Engage the surface and adjust the
Integral gain
and
Setpoint
to obtain a good image. Keep
the
Setpoint
low if possible, and the
Z Center Position
close to
0V
. Notice that the
Scan
rate
is set much higher (~
61 Hz
) for atomic-scale images, this to defeat some of the noise
due to thermal drift.
If dif
fi
culty is experienced obtaining an image,
Withdraw
and try a different site on the surface,
then
Engage
again. Many users
fi
nd it easiest to obtain good image measurements if the sample is
rotated until atoms are oriented vertically.
4. After obtaining a satisfactory image,
Capture
it. The image should appear similar to the
image of graphite shown below. The captured image will be used for the calibration
procedure described in the next several steps.
Figure 15.9a
Typical atomic scan of graphite. Note the highly regular lattice of the atoms. The cursor line
describes a distance of 6.66Å.
