Table 1 Drift and diffusion terms in Eq. (5) for two typical experimental conditions.

From: A Langevin equation that governs the irregular stick-slip nano-scale friction

Surface

Scan velocity

Normal load

Drift

Diffusion

NaCl(001)

13 nm/s

3 nN

(−0.61 ± 0.02) f

(0.37 ± 0.01) f2

HOPG(0001)

60 nm/s

11 nN

(−0.38 ± 0.02) f

(0.25 ± 0.01) f2