UNIMO Technology UDR-204 Manuál s instrukcemi stáhnout pdf (Strana 328)

Calibration, Maintenance, Troubleshooting and Warranty

Calibration of “A” Scanners for Atomic-scale Measurement

308 MultiMode SPM Instruction Manual Rev. B

5. Go to the Offline > View > Top View option and measure the spacings between atoms using

the mouse. Depending upon whether the sample is graphite or mica, measure the spacings as

shown below.

Record the spacings between at least ten atoms observed in the captured image. Take several

samples of each measurement and average them to ensure accurate results. (Achieve this quickly by

alternatively “walking” the cursor line from atom to atom; the average distance displays on the

bottom-right corner of the display monitor’s status bar). If the measurements vary by more than 2

percent from the dimensions shown above, make a correction.

6. Correction of the X- and Y-axis is essentially the same procedure as described in Section

15.7.2-Section 15.7.3 of this chapter and will not be repeated here. The only significant

difference is that you must adjust the known distances for the smaller, atomic spacings of the

atoms. Furthermore, you only adjust the sensitivity parameters for atomic-scale imaging;

namely:

• X fast sens at 0º Scan angle

• Y slow sens at 0º Scan angle

• Y fast sens at 90º Scan angle

• X slow sens at 90º Scan angle

A = 0.519nm

B = 0.900nm

C = 1.37nm

A = 0.255nm

B = 0.433nm

C = 0.666nm

Atomic Spacing for Mica

Atomic Spacing for Graphite

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UNIMO Technology UDR-204 Manuál s instrukcemi Strana 328