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← ScienceWhich risk increases when scanning tunneling microscope tip retracts?
A)Increased contamination of sample surface✓
B)Enhanced quantum confinement effect
C)Decreased electron-phonon scattering rate
D)Elevated tip material ionization level
💡 Explanation
Increased contamination results when an STM tip retracts because Van der Waals force allows the adhesion of stray atoms. This causes surface contamination, rather than quantization, reduced scattering, or ionization due to the absence of robust electric field interaction.
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