Trimer

Source of data

α, deg

d, Å

E_b, eV

Si₃

Our method

≈80

2.1

3.7

Other calculations

77.8^a

78.10^c

79.6^e

2.26^b

2.177^c

2.51^b

2.93^d

Al₃

Our method

60

2.3

2.4

Other calculations

60^f

60^h

2.50^f

2.55^h

1.74^g

1.96^f

С₃

Our method

180

1.2

7.0

Other calculations

180ⁱ

180^j

1.29^c

1.3^j

1.316^k

6.8ⁱ

5.0^k