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root/group/trunk/OOPSE-4/forceFields/MnM.frc
Revision: 3414
Committed: Mon Jun 16 19:53:53 2008 UTC (16 years, 1 month ago) by chuckv
File size: 15821 byte(s)
Log Message:
Added TraPPE torsions for thiols.

File Contents

# Content
1 // This is the forcefield file for the Metal-NonMetal(MnM) Interaction Forcefield
2 //
3 // The sections are divided into AtomTypes
4 //
5
6
7 begin Options
8 Name = "MnM"
9 MetallicEnergyUnitScaling 23.0605423
10 end Options
11
12
13 begin AtomTypes
14 //Name mass (amu)
15 CH4 16.05
16 CH3 15.04
17 CH2 14.03
18 CH 13.02
19 // CH3 (sp3) thiol/sulfide/disulfide
20 CH3S 15.04
21 // CH2 (sp3) thiol/sulfide/disulfide
22 CH2S 14.03
23 //CH (sp3) all other/thiol
24 CHS 13.02
25 //C (sp3) all other/thiol
26 CS 12.0107
27 // sulfone
28 SYZ 32.0655
29 // O in sulfone
30 //OY
31 // thiol S
32 SH 32.0655
33 //Thiol H
34 HS 1.0079
35 //Thiol S
36 S 32.0655
37 // Sulfoxide
38 SZ 32.0655
39 // Sulfur in disulfide
40 SS 32.0655
41 // Sulfur in aromatic (thiophene)
42 SP 32.0655
43 // sp2 carbon in thiophene
44 CS 12.0107
45 // Sulfur attached to gold
46 SAu 228.9807
47
48 //Water
49 SSD 18.0153
50 SSD1 18.0153
51 SSD_E 18.0153
52 SSD_RF 18.0153
53 O_TIP3P 15.9994
54 O_TIP4P 15.9994
55 O_TIP4P-Ew 15.9994
56 O_TIP5P 15.9994
57 O_TIP5P-E 15.9994
58 O_SPCE 15.9994
59 O_SPC 15.9994
60 H_TIP3P 1.0079
61 H_TIP4P 1.0079
62 H_TIP4P-Ew 1.0079
63 H_TIP5P 1.0079
64 H_SPCE 1.0079
65 H_SPC 1.0079
66 EP_TIP4P 0.0
67 EP_TIP4P-Ew 0.0
68 EP_TIP5P 0.0
69
70 //Standard Atoms
71 C 12.0107
72 S 32.0655
73 Ni 58.710
74 Cu 63.550
75 Rh 102.90550
76 Pd 106.42
77 Ag 107.8682
78 Ir 192.217
79 Pt 195.09
80 Au 196.97
81 end AtomTypes
82
83 begin DirectionalAtomTypes
84 //Name I_xx I_yy I_zz (All moments in (amu*Ang^2)
85 SSD 1.7696 0.6145 1.1550
86 SSD1 1.7696 0.6145 1.1550
87 SSD_E 1.7696 0.6145 1.1550
88 SSD_RF 1.7696 0.6145 1.1550
89 end DirectionalAtomTypes
90
91
92 begin LennardJonesAtomTypes
93 //Name epsilon sigma
94 SSD 0.152 3.051
95 SSD1 0.152 3.016
96 SSD_E 0.152 3.035
97 SSD_RF 0.152 3.019
98 O_TIP3P 0.1521 3.15061
99 O_TIP4P 0.1550 3.15365
100 O_TIP4P-Ew 0.16275 3.16435
101 O_TIP5P 0.16 3.12
102 O_TIP5P-E 0.178 3.097
103 O_SPCE 0.15532 3.16549
104 O_SPC 0.15532 3.16549
105 // From TraPPE-UA JPCB, 109, 24100 and JCPB 102,2569
106 CH4 0.2941 3.73
107 CH3 0.1947 3.75
108 CH2 0.09140 3.95
109 CH 0.0987 4.68
110 CS 0.0009935 6.40
111 CH3S 0.1947 3.75
112 CH2S 0.09140 3.95
113 CHS 0.0987 4.68
114 S 0.3954 3.58
115 SH 0.4610 3.62
116 SS 0.3279 3.72
117 SP 0.3576 3.60
118 // ---- End From TraPPE-UA
119 end LennardJonesAtomTypes
120
121 begin SCAtomTypes
122 // Name epsilon(eV) c m n alpha(angstroms)
123 Ni 0.0073767 84.745 5.0 10.0 3.5157
124 Cu 0.0057921 84.843 5.0 10.0 3.6030
125 Rh 0.0024612 305.499 5.0 13.0 3.7984
126 Pd 0.0032864 148.205 6.0 12.0 3.8813
127 Ag 0.0039450 96.524 6.0 11.0 4.0691
128 Ir 0.0037674 224.815 6.0 13.0 3.8344
129 Pt 0.0097894 71.336 7.0 11.0 3.9163
130 Au 0.0078052 53.581 8.0 11.0 4.0651
131 end SCAtomTypes
132
133
134 // Metal non-metal interactions.
135 // Format: Metal Atom Type, Non-Metal Atom Type, Interaction Type, Interaction Parameters
136 // Where interaction type can be: MAW, LennardJones or ShiftedMorse or RepulsiveMorse
137 begin MetalNonMetalInteractions
138
139 //MAW (Metal Angular Water section)
140 // r_e, D_e beta ca1 cb1
141 Cu SSD_E MAW 2.5525 1.9850 1.1680 1.1250 0.750000
142 //Au SSD_E MAW 2.8170 1.7850 1.2680 1.2500 0.2050 0.0
143 //Au SSD_E MAW 2.7510 2.95 1.101 0.750000 0.750000
144 //1. 1.5 2.6500001 -3.000162356E-2 1.30999744
145 //Au SSD_E MAW 2.7 1.06 1.264 0.16 0.8
146 Au SSD_E MAW 2.68 0.6 1.33 0.95 -0.25
147
148 //LennardJones
149 // sigma epsilon
150 Au CH3 LennardJones 3.54 0.2146
151 Au CH2 LennardJones 3.54 0.1749
152 Au S LennardJones 4.45 9.180
153
154 //Shifted Morse
155 // r0 D0 beta0
156 Au O_SPCE ShiftedMorse 3.70 0.0424 0.769
157
158 //Repulsive Morse
159 // r0 D0 beta0
160 Au H_SPCE RepulsiveMorse -1.00 0.00850 0.769
161
162
163 end MetalNonMetalInteractions
164
165
166 begin ChargeAtomTypes
167 // Name charge
168 O_TIP3P -0.834
169 O_SPCE -0.8476
170 O_SPC -0.82
171 H_TIP3P 0.417
172 H_TIP4P 0.520
173 H_TIP4P-Ew 0.52422
174 H_TIP5P 0.241
175 H_SPCE 0.4238
176 H_SPC 0.42
177 EP_TIP4P -1.040
178 EP_TIP4P-Ew -1.04844
179 EP_TIP5P -0.241
180 end ChargeAtomTypes
181
182 begin MultipoleAtomTypes
183 // OOPSE currently only supports charge-charge, charge-dipole,
184 // dipole-dipole, and charge-quadrupole interactions.
185 // Dipoles may be either traditional point-dipoles or split-dipoles.
186 // possible formats for a multipolar atom type are:
187 //
188 // Point-dipoles:
189 // name d phi theta psi dipole_moment
190 //
191 // Split-dipoles:
192 // name s phi theta psi dipole_moment splitdipole_distance
193 //
194 // Point-Quadrupoles:
195 // name q phi theta psi Qxx Qyy Qzz
196 //
197 // Atoms with both dipole and quadrupole moments:
198 // name dq phi theta psi dipole_moment Qxx Qyy Qzz
199 //
200 // Atoms with both split dipoles and quadrupole moments:
201 // name sq phi theta psi dipole_moment splitdipole_distance Qxx Qyy Qzz
202 //
203 // Euler angles are given in zxz convention in units of degrees.
204 //
205 // Charges are given in units of electrons.
206 //
207 // Dipoles are given in units of Debyes.
208 //
209 // Split dipole distances are given in units of Angstroms.
210 //
211 // Quadrupole moments are given in units of 10^-26 esu cm^2 (also known as an
212 // esu centi-barn)
213 //
214 SSD_E dq 0.0 0.0 0.0 2.42 -1.682 1.762 -0.08
215 SSD_RF dq 0.0 0.0 0.0 2.48 -1.682 1.762 -0.08
216 SSD dq 0.0 0.0 0.0 2.35 -1.682 1.762 -0.08
217 SSD1 dq 0.0 0.0 0.0 2.35 -1.682 1.762 -0.08
218 end MultipoleAtomTypes
219
220 begin StickyAtomTypes
221 //name w0 v0 (kcal/mol) v0p rl (Ang) ru rlp rup
222 SSD_E 0.07715 3.90 3.90 2.40 3.80 2.75 3.35
223 SSD_RF 0.07715 3.90 3.90 2.40 3.80 2.75 3.35
224 SSD 0.07715 3.7284 3.7284 2.75 3.35 2.75 4.0
225 SSD1 0.07715 3.6613 3.6613 2.75 3.35 2.75 4.0
226 end StickyAtomTypes
227
228
229 begin BondTypes
230
231 //Atom1 Atom2 Fixed
232 //V_Fixed = 0
233
234 //Atom1 Atom2 Harmonic b0 Kb (kcal/mol)
235 //V_Harmonic = 0.5*Kb(b- bo)^2
236 //Harmonic Examples
237 CH3 CH3 Harmonic 1.526 260
238 CH3 CH2 Harmonic 1.526 260
239 CH3 CH Harmonic 1.526 260
240 CH2 CH2 Harmonic 1.526 260
241 CH2 CH Harmonic 1.526 260
242 CH CH Harmonic 1.526 260
243 // fix the Kb for the thiol below:
244 S CH2 Harmonic 1.82 281
245 SH CH2 Harmonic 1.82 281
246
247 //Atom1 Atom2 Cubic b0 K3 K2 K1 K0
248 //V_Cubic = K3(b - b0)^3 + K2(b - b0)^2 + K1(b - b0) + K0
249
250
251 //Atom1 Atom2 Quartic b0 K4 K3 K2 K1 K0
252 //V_Quartic = K4(b - b0)^4 + K3(b - b0)^3 + K2(b - b0)^2 + K1(b - b0) + K0
253
254
255 //Atom1 Atom2 Polynomial b0 i Ki [j Kj]
256 //V_Quartic = Ki(b - b0)^i + Kj(b - b0)^j + ...
257
258
259 end BondTypes
260
261 begin BendTypes
262
263 //Harmonic
264 //Atom1 Atom2 Atom3 Harmonic Theta0 Ktheta
265 //V_Harmonic = 0.5*Ktheta(Theta - Theta0)^2
266 //Ktheta: kcal/mole/rad**2
267 //Theta0: degrees
268 //Harmonic examples
269 //
270 //CH3 CH2 CH3 Harmonic 114.0 117.68
271 //CH3 CH2 CH2 Harmonic 114.0 117.68
272 //CH3 CH2 CH Harmonic 114.0 117.68
273 //CH3 CH CH3 Harmonic 112.0 117.68
274 //CH3 CH CH2 Harmonic 112.0 117.68
275 //CH3 CH CH Harmonic 112.0 117.68
276 //CH2 CH2 CH2 Harmonic 114.0 117.68
277 //CH2 CH2 CH Harmonic 114.0 117.68
278 CH2 CH CH2 Harmonic 112.0 117.68
279 CH2 CH CH Harmonic 112.0 117.68
280 //CH CH2 CH Harmonic 114.0 117.68
281 CH CH CH Harmonic 112.0 117.68
282
283 //From Lubna et al.JPCB 109, 24100 (2005) TraPPE
284 CH3 CH2 SH Harmonic 96.0 67.220
285 CH2 CH2 SH Harmonic 96.0 67.220
286 CH2 CH2 S Harmonic 114.0 124.19
287 CH3 CH2 S Harmonic 114.0 124.19
288 CH3 CH2 CH3 Harmonic 114.0 124.19
289 CH3 CH2 CH2 Harmonic 114.0 124.19
290 CH2 CH2 CH2 Harmonic 114.0 124.19
291 CH3 CH2 CH Harmonic 114.0 124.19
292
293
294
295 //UreyBradley
296 //Atom1 Atom2 Atom3 UreyBradley Theta0 Ktheta S0 Kub
297 //V_UreyBradleyBend = Ktheta(Theta - Theta0)^2 + Kub(S - S0)^2
298 //Ktheta: kcal/mole/rad**2
299 //Theta0: degrees
300 //Kub: kcal/mole/A**2
301 //S0: A
302
303 //Cubic
304 //Atom1 Atom2 Atom3 Cubic Theta0 K3 K2 K1 K0
305 //V_Cubic = K3(Theta - Theta0)^3 + K2(Theta - Theta0)^2 + K1(Theta - Theta0) + K0
306
307 //Quartic
308 //Atom1 Atom2 Atom3 Quartic Theta0 K4 K3 K2 K1 K0
309 //V_Quartic = K4(Theta - Theta0)^4 + K3(Theta - Theta0)^3 + K2(Theta - Theta0)^2 + K1(Theta - Theta0) + K0
310
311 //Polynomial
312 //Atom1 Atom2 Atom3 Polynomial Theta0 i Ki [j Kj]
313 //V_Polynomial = Ki(Theta - Theta0)^i + Kj(Theta - Theta0)^j + ...
314
315 end BendTypes
316
317 begin TorsionTypes
318
319 // All thiol torsions from Kautman and Klein (J. Phys. Chem. 1989, 91, 4994-5001)
320
321 //S CH2 CH2 CH3 Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
322 //S CH2 CH2 CH2 Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
323 //S CH2 CH2 CH Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
324 //S CH2 CH2 C Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
325
326 // All type 1 possibilities from Dubbeldam et al. (J. Phys. Chem. B 2004, 108, 12301-12313)
327
328 //CH3 CH2 CH2 CH3 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
329 //CH3 CH2 CH2 CH2 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
330 //CH3 CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
331 //CH3 CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
332 //CH2 CH2 CH2 CH2 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
333 //CH2 CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
334 //CH2 CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
335 //CH CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
336 //CH CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
337 //C CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
338
339 // All type 2 possibilities:
340
341 //H CH CH2 CH3 Polynomial 0 2.7167 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
342 //H CH CH2 CH2 Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
343 //H CH CH2 CH Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
344 //H CH CH2 C Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
345
346 // All type 3 possibilities:
347
348 //CH3 C CH2 CH3 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
349 //CH3 C CH2 CH2 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
350 //CH3 C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
351 //CH3 C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
352 //CH2 C CH2 CH2 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
353 //CH2 C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
354 //CH2 C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
355 //CH C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
356 //CH C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
357 //C C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
358
359 // All type 4 possibilities:
360
361 //CH3 C C CH3 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
362 //CH3 C C CH2 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
363 //CH3 C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
364 //CH3 C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
365 //CH2 C C CH2 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
366 //CH2 C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
367 //CH2 C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
368 //CH C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
369 //CH C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
370 //C C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
371
372 //All type 5 possibilities:
373
374 //CH3 C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
375 //CH2 C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
376 //CH C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
377 //C C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
378
379 //All type 6 possibilities:
380
381 //H CH CH H Polynomial 0 2.1706 1 5.609 2 -1.804 3 -5.976 4 3.6089 5 -3.6089
382
383 //Cubic
384 //Atom1 Atom2 Atom3 Atom4 Cubic k3 k2 k1 k0 ( all are kcal/mol )
385 //V_Cubic = k3(cos phi)^3 + k2(cos phi)^2 + k1(cos phi) + k0
386 //Cubic Examples
387 //CH3 CH2 CH2 CH3 Cubic 5.9602 -0.2568 -3.802 2.1586
388 CH3 CH2 CH CH3 Cubic 3.3254 -0.4215 -1.686 1.1661
389 CH3 CH CH CH3 Cubic 3.3254 -0.4215 -1.686 1.1661
390 //CH3 CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
391 CH3 CH2 CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
392 CH3 CH CH2 CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
393 CH3 CH CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
394 //CH3 CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
395 CH3 CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
396 CH3 CH CH2 CH Cubic 3.3254 -0.4215 -1.686 1.1661
397 CH3 CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
398 //CH2 CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
399 CH2 CH2 CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
400 CH2 CH CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
401 CH2 CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
402 CH2 CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
403 CH2 CH CH2 CH Cubic 3.3254 -0.4215 -1.686 1.1661
404 CH2 CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
405 CH CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
406 CH CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
407 CH CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
408 //S CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
409
410 //Opls
411 //Atom1 Atom2 Atom3 Atom4 Opls v1 v2 v3
412 //V_Opls = v1 / 2 * [1 + cos(phi)] + v2 / 2 * [1 - cos(2*phi)] + v3 / 2 * [1 + cos(3*phi)]
413 //units for v_n: kcal / mol
414
415
416 //Trappe
417 //Atom1 Atom2 Atom3 Atom4 Trappe c0 c1 c2 c3
418 //V_Opls = c0 + c1 * [1 + cos(phi)] + c2 * [1 - cos(2*phi)] + c3 * [1 + cos(3*phi)]
419 //units for c_n: kcal / mol
420
421 //From Martin et al. JPCB 120, 2569 (1998)
422 CH3 CH2 CH2 CH3 Trappe 0.0 0.70544 -0.13549 1.5723
423 CH3 CH2 CH2 CH2 Trappe 0.0 0.70544 -0.13549 1.5723
424 CH3 CH2 CH2 CH Trappe 0.0 0.70544 -0.13549 1.5723
425 CH2 CH2 CH2 CH2 Trappe 0.0 0.70544 -0.13549 1.5723
426
427
428 //From Lubna et al.JPCB 109, 24100 (2005)
429 CH3 CH2 CH2 SH Trappe 0.10507 -0.10342 0.036680 0.60874
430 CH2 CH2 CH2 SH Trappe 0.10507 -0.10342 0.036680 0.60874
431 CH3 CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
432 CH2 CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
433 CH CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
434 CH2 S S CH2 Trappe 3.5049 0.79083 -4.3348 1.003932
435 CH3 S S CH3 Trappe 3.5049 0.79083 -4.3348 1.003932
436 CH3 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
437 CH3 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
438 CH2 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
439 CH CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
440 CH3 CH2 C S Trappe 0.0 0.0 0.0 0.91658
441 CH2 CH2 C S Trappe 0.0 0.0 0.0 0.91658
442 CH CH2 C S Trappe 0.0 0.0 0.0 0.91658
443 CH3 CG S H Trappe 0.0 0.0 0.0 0.79480
444
445 //Charmm
446 //Atom1 Atom2 Atom3 Atom4 Charmm Kchi n delta [Kchi n delta]
447 //V_Charmm = Kchi(1 + cos(n(chi) - delta))
448 //Kchi: kcal/mole
449 //n: multiplicity
450 //delta: degrees
451 //in some cases, a Charmm may have two or three terms. If n is equal to 0, it falls back to harmonic form
452
453 //Quartic
454 //Atom1 Atom2 Atom3 Atom4 Quartic k4 k3 k2 k1 k0 ( all are kcal/mol )
455 //V_Quartic = k4(cos phi)^4 + k3(cos phi)^3 + k2(cos phi)^2 + k1(cos phi) + k0
456
457 //Polynomial
458 //Atom1 Atom2 Atom3 Atom4 Polynomial i Ki [j Kj]
459 //VPolynomial = Ki (cos phi)^i + ... + Kj (cos phi)^j
460
461
462 end TorsionTypes
463
464