BioPHYSICAL chemistry

212 PART 2 QUANTUM MECHANICS AND SPECTROSCOPY

Computer:

Scan generation and

image display

(a)

Single-

tube

piezo

Electronics:

Positioning and feedback control

Signal conditioning

High voltage

piezo drive

Preamp

Tip bias

Current

collection

conversion

iv

Tunneling current

(b) Scan

Figure 10.12
A schematic
representation of (a)
a scanning tunneling
microscope with (b)
an expanded view of
the probe.