Predict the order of steps followed during viewing a sample under scanning tunneling microscopy.

Predict the order of steps followed during viewing a sample under scanning tunneling microscopy. Correct Answer Tip is held close to sample ➔ Application of bias voltage between tip and ample ➔ Tip receives tunneling current ➔ Tip is moved across the surface ➔ Digital images of the surface are formed

For imaging the sample, the tip of the microscope is brought close to it by a cross positioning mechanism that is usually monitored visually. The tip positioning is controlled by piezoelectric scanner tubes. A bias voltage is applied between the sample and the tip which starts receiving the tunneling current. Once this is achieved the tip is moved across the surface in a discrete x-y matrix. Digital images of the surface are formed during the process.