The mobilities of individual adatoms, and of various structural elements of the O/Cu system, were analyzed on the basis of scanning tunnelling microscopic data. A value of about x 10-14cm2/s was estimated for the self-diffusivity of Cu on the base (110) surface at 300K. This was deduced from the motion of steps. The supply of Cu adatoms by evaporation from steps, rather than the migration of individual Cu adatoms on the terraces was the rate-limiting process in the so-called added-row reconstruction process.

J.Wintterlin, R.Schuster, D.J.Coulman, G.Ertl, R.J.Behm: Journal of Vacuum Science and Technology B, 1991, 9[2], 902-8

 

Table 40

Diffusivity of Be in Cu Crystals

 

Temperature (K)

Annealing Ambient

D (m2/s)

583

vacuum

3.00 x 10-22

597

vacuum

6.97 x 10-22

603

vacuum

9.36 x 10-22

605

vacuum

1.00 x 10-21

615

vacuum

2.28 x 10-21

642

vacuum

1.21 x 10-20

651

Ar/H2

1.56 x 10-20

654

Ar/H2

2.13 x 10-20

654

vacuum

1.80 x 10-20

655

vacuum

2.27 x 10-20

682

vacuum

6.07 x 10-20

702

vacuum

1.70 x 10-19

705

Ar/H2

1.73 x 10-19

718

Ar/H2

3.93 x 10-19

730

vacuum

7.05 x 10-19

730

vacuum

6.82 x 10-19

751

Ar/H2

1.50 x 10-18

774

Ar/H2

5.00 x 10-18

800

Ar/H2

1.30 x 10-17