N o s / N A l b

ξ in Å

1 × 10−7

219

5 × 10−8

155

3 × 10−8

120

2 × 10−8

98

1 × 10−8

69

8 × 10−8

62

6 × 10−8

54

4 × 10−8

44

2 × 10−8

31

1 × 10−9

22