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Which risk increases when a scanning tunneling microscope tip's electron cloud highly increases?

A)Sample amorphization via electron knockout
B)Increased instrument stage thermal expansion
C)Tip contamination from ambient gases
D)Reduced tunneling current signal strength

💡 Explanation

Sample amorphization risk increases because high electron densities increase electron knockout via the inelastic scattering mechanism, thus displacing atoms. Therefore, the sample's crystal structure degrades, rather than improved signal or thermal expansion, under these conditions.

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