1
<SW_params n_types="3" label="PRB_31_plus_H_Ge">
2
<comment> Stillinger and Weber, Phys. Rev. B 31 p 5262 (1984), extended for other elements. Ge and Si-Ge from Ethier and Lewis '92 </comment>
3
<per_type_data type="1" atomic_num="1" />
4
<per_type_data type="2" atomic_num="14" />
5
<per_type_data type="3" atomic_num="32" />
6
<per_pair_data atnum_i="1" atnum_j="1" AA="0.0" BB="0.0"
7
p="0" q="0" a="1.0" sigma="1.0" eps="0.0" />
8
<per_pair_data atnum_i="1" atnum_j="14" AA="8.581214" BB="0.0327827"
9
p="4" q="0" a="1.25" sigma="2.537884" eps="2.1672" />
10
<per_pair_data atnum_i="14" atnum_j="14" AA="7.049556277" BB="0.6022245584"
11
p="4" q="0" a="1.80" sigma="2.0951" eps="2.1675" />
13
<!-- pair data for Ge and Si-Ge -->
14
<per_pair_data atnum_i="32" atnum_j="32" AA="7.049556277" BB="0.6022245584"
15
p="4" q="0" a="1.80" sigma="2.181" eps="1.92590365783410138248" />
16
<per_pair_data atnum_i="14" atnum_j="32" AA="7.049556277" BB="0.6022245584"
17
p="4" q="0" a="1.80" sigma="2.138" eps="2.04313391101890694121" />
19
<!-- triplet terms: atnum_c is the center atom, neighbours j and k -->
20
<per_triplet_data atnum_c="1" atnum_j="1" atnum_k="1"
21
lambda="21.0" gamma="1.20" eps="2.1675" />
22
<per_triplet_data atnum_c="1" atnum_j="1" atnum_k="14"
23
lambda="21.0" gamma="1.20" eps="2.1675" />
24
<per_triplet_data atnum_c="1" atnum_j="14" atnum_k="14"
25
lambda="21.0" gamma="1.20" eps="2.1675" />
27
<per_triplet_data atnum_c="14" atnum_j="1" atnum_k="1"
28
lambda="21.0" gamma="1.20" eps="2.1675" />
29
<per_triplet_data atnum_c="14" atnum_j="1" atnum_k="14"
30
lambda="21.0" gamma="1.20" eps="2.1675" />
31
<per_triplet_data atnum_c="14" atnum_j="14" atnum_k="14"
32
lambda="21.0" gamma="1.20" eps="2.1675" />
34
<!-- triplet data for Ge and Si-Ge -->
35
<per_triplet_data atnum_c="14" atnum_j="14" atnum_k="32"
36
lambda="23.1" gamma="1.20" eps="2.10444772465437788017" />
37
<per_triplet_data atnum_c="14" atnum_j="32" atnum_k="32"
38
lambda="25.5" gamma="1.20" eps="2.04326828917050691242" />
39
<per_triplet_data atnum_c="32" atnum_j="14" atnum_k="14"
40
lambda="25.5" gamma="1.20" eps="2.04326828917050691242" />
41
<per_triplet_data atnum_c="32" atnum_j="14" atnum_k="32"
42
lambda="28.1" gamma="1.20" eps="1.98396169354838709676" />
43
<per_triplet_data atnum_c="32" atnum_j="32" atnum_k="32"
44
lambda="31.0" gamma="1.20" eps="1.92590365783410138247" />