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root/OpenMD/branches/development/samples/RNEMD/MnM.frc
Revision: 1775
Committed: Wed Aug 8 18:45:52 2012 UTC (12 years, 9 months ago) by gezelter
File size: 16254 byte(s)
Log Message:
Tracking down a strange bug report.   Fixing some output. Fixing some samples.

File Contents

# User Rev Content
1 gezelter 1775 // 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 BaseAtomTypes
14     //Name mass (amu)
15     CH4 16.05
16     CH3 15.04
17     CH2 14.03
18     CH 13.02
19     // Aromatic CH as in benzene
20     CHar 13.02
21     //
22     RCHar 12.0107
23     // CH3 (sp3) thiol/sulfide/disulfide
24     CH3S 15.04
25     // CH2 (sp3) thiol/sulfide/disulfide
26     CH2S 14.03
27     //CH (sp3) all other/thiol
28     CHS 13.02
29     //C (sp3) all other/thiol
30     CS 12.0107
31     // sulfone
32     SYZ 32.0655
33     // O in sulfone
34     //OY
35     // thiol S
36     SH 32.0655
37     //Thiol H
38     HS 1.0079
39     //Thiol S
40     S 32.0655
41     // Sulfoxide
42     SZ 32.0655
43     // Sulfur in disulfide
44     SS 32.0655
45     // Sulfur in aromatic (thiophene)
46     SP 32.0655
47     // sp2 carbon in thiophene
48     CS 12.0107
49     // Sulfur attached to gold
50     SAu 228.9807
51    
52    
53     //Water
54     SSD 18.0153
55     SSD1 18.0153
56     SSD_E 18.0153
57     SSD_RF 18.0153
58     O_TIP3P 15.9994
59     O_TIP4P 15.9994
60     O_TIP4P-Ew 15.9994
61     O_TIP5P 15.9994
62     O_TIP5P-E 15.9994
63     O_SPCE 15.9994
64     O_SPC 15.9994
65     H_TIP3P 1.0079
66     H_TIP4P 1.0079
67     H_TIP4P-Ew 1.0079
68     H_TIP5P 1.0079
69     H_SPCE 1.0079
70     H_SPC 1.0079
71     EP_TIP4P 0.0
72     EP_TIP4P-Ew 0.0
73     EP_TIP5P 0.0
74    
75     //Standard Atoms
76     C 12.0107
77     S 32.0655
78     Ni 58.710
79     Cu 63.550
80     Rh 102.90550
81     Pd 106.42
82     Ag 107.8682
83     Ir 192.217
84     Pt 195.09
85     Au 196.97
86     end BaseAtomTypes
87    
88     begin AtomTypes
89     end AtomTypes
90    
91     begin DirectionalAtomTypes
92     //Name I_xx I_yy I_zz (All moments in (amu*Ang^2)
93     SSD 1.7696 0.6145 1.1550
94     SSD1 1.7696 0.6145 1.1550
95     SSD_E 1.7696 0.6145 1.1550
96     SSD_RF 1.7696 0.6145 1.1550
97     end DirectionalAtomTypes
98    
99    
100     begin LennardJonesAtomTypes
101     //Name epsilon sigma
102     SSD 0.152 3.051
103     SSD1 0.152 3.016
104     SSD_E 0.152 3.035
105     SSD_RF 0.152 3.019
106     O_TIP3P 0.1521 3.15061
107     O_TIP4P 0.1550 3.15365
108     O_TIP4P-Ew 0.16275 3.16435
109     O_TIP5P 0.16 3.12
110     O_TIP5P-E 0.178 3.097
111     O_SPCE 0.15532 3.16549
112     O_SPC 0.15532 3.16549
113     // From TraPPE-UA JPCB, 109, 24100 and JCPB 102,2569
114     CH4 0.2941 3.73
115     CH3 0.1947 3.75
116     CH2 0.09140 3.95
117     CH 0.0987 4.68
118     CS 0.0009935 6.40
119     CH3S 0.1947 3.75
120     CH2S 0.09140 3.95
121     CHS 0.0987 4.68
122     // From CPC 177 2007 S-S distance on gold surfaces is 4.45
123     S 0.3954 4.45
124     SH 0.4610 3.62
125     SS 0.3279 3.72
126     SP 0.3576 3.60
127     //From TraPPE-UA JPCB 104, 8008
128     CHar 0.1003 3.695
129     RCHar 0.04173 3.88
130     // ---- End From TraPPE-UA
131    
132     end LennardJonesAtomTypes
133    
134     begin SCAtomTypes
135     // Name epsilon(eV) c m n alpha(angstroms)
136     Ni 0.0073767 84.745 5.0 10.0 3.5157
137     Cu 0.0057921 84.843 5.0 10.0 3.6030
138     Rh 0.0024612 305.499 5.0 13.0 3.7984
139     Pd 0.0032864 148.205 6.0 12.0 3.8813
140     Ag 0.0039450 96.524 6.0 11.0 4.0691
141     Ir 0.0037674 224.815 6.0 13.0 3.8344
142     Pt 0.0097894 71.336 7.0 11.0 3.9163
143     Au 0.0078052 53.581 8.0 11.0 4.0651
144     end SCAtomTypes
145    
146    
147     // Metal non-metal interactions.
148     // Format: Metal Atom, Non-Metal Atom, Interaction Type, Interaction Parameters
149     // Interaction type can be: MAW, LennardJones or ShiftedMorse or RepulsiveMorse
150     begin NonBondedInteractions
151    
152     //MAW (Metal Angular Water section)
153     // r_e, D_e beta ca1 cb1
154     Cu SSD_E MAW 2.5525 1.9850 1.1680 1.1250 0.750000
155     Au SSD_E MAW 2.68 0.6 1.33 0.95 -0.25
156    
157     //LennardJones
158     // sigma epsilon
159     Au CH3 LennardJones 3.54 0.2146
160     Au CH2 LennardJones 3.54 0.1749
161     //Au SH LennardJones 2.40 8.465
162     Au S LennardJones 2.40 8.465
163    
164     //Shifted Morse
165     // r0 D0 beta0
166     Au O_SPCE ShiftedMorse 3.70 0.0424 0.769
167    
168     //Repulsive Morse
169     // r0 D0 beta0
170     Au H_SPCE RepulsiveMorse -1.00 0.00850 0.769
171    
172     //Repulsive Power
173     Au ON RepulsivePower 3.47005 0.186208 11
174     Au NO RepulsivePower 3.53955 0.168629 11
175     end NonBondedInteractions
176    
177    
178     begin ChargeAtomTypes
179     // Name charge
180     O_TIP3P -0.834
181     O_SPCE -0.8476
182     O_SPC -0.82
183     H_TIP3P 0.417
184     H_TIP4P 0.520
185     H_TIP4P-Ew 0.52422
186     H_TIP5P 0.241
187     H_SPCE 0.4238
188     H_SPC 0.42
189     EP_TIP4P -1.040
190     EP_TIP4P-Ew -1.04844
191     EP_TIP5P -0.241
192     end ChargeAtomTypes
193    
194     begin MultipoleAtomTypes
195     // OpenMD currently only supports charge-charge, charge-dipole,
196     // dipole-dipole, and charge-quadrupole interactions.
197     // Dipoles may be either traditional point-dipoles or split-dipoles.
198     // possible formats for a multipolar atom type are:
199     //
200     // Point-dipoles:
201     // name d phi theta psi dipole_moment
202     //
203     // Split-dipoles:
204     // name s phi theta psi dipole_moment splitdipole_distance
205     //
206     // Point-Quadrupoles:
207     // name q phi theta psi Qxx Qyy Qzz
208     //
209     // Atoms with both dipole and quadrupole moments:
210     // name dq phi theta psi dipole_moment Qxx Qyy Qzz
211     //
212     // Atoms with both split dipoles and quadrupole moments:
213     // name sq phi theta psi dipole_moment splitdipole_distance Qxx Qyy Qzz
214     //
215     // Euler angles are given in zxz convention in units of degrees.
216     //
217     // Charges are given in units of electrons.
218     //
219     // Dipoles are given in units of Debyes.
220     //
221     // Split dipole distances are given in units of Angstroms.
222     //
223     // Quadrupole moments are given in units of 10^-26 esu cm^2 (also known as an
224     // esu centi-barn)
225     //
226     SSD_E dq 0.0 0.0 0.0 2.42 -1.682 1.762 -0.08
227     SSD_RF dq 0.0 0.0 0.0 2.48 -1.682 1.762 -0.08
228     SSD dq 0.0 0.0 0.0 2.35 -1.682 1.762 -0.08
229     SSD1 dq 0.0 0.0 0.0 2.35 -1.682 1.762 -0.08
230     end MultipoleAtomTypes
231    
232     begin StickyAtomTypes
233     //name w0 v0 (kcal/mol) v0p rl (Ang) ru rlp rup
234     SSD_E 0.07715 3.90 3.90 2.40 3.80 2.75 3.35
235     SSD_RF 0.07715 3.90 3.90 2.40 3.80 2.75 3.35
236     SSD 0.07715 3.7284 3.7284 2.75 3.35 2.75 4.0
237     SSD1 0.07715 3.6613 3.6613 2.75 3.35 2.75 4.0
238     end StickyAtomTypes
239    
240    
241     begin BondTypes
242    
243     //Atom1 Atom2 Fixed
244     //V_Fixed = 0
245    
246     //Atom1 Atom2 Harmonic b0 Kb (kcal/mol)
247     //V_Harmonic = 0.5*Kb(b- bo)^2
248     //Harmonic Examples
249     CH3 CH3 Harmonic 1.526 260
250     CH3 CH2 Harmonic 1.526 260
251     CH3 CH Harmonic 1.526 260
252     CH2 CH2 Harmonic 1.526 260
253     CH2 CH Harmonic 1.526 260
254     CH CH Harmonic 1.526 260
255     // fix the Kb for the thiol below:
256     S CH2 Harmonic 1.82 281
257     SH CH2 Harmonic 1.82 281
258    
259     //Atom1 Atom2 Cubic b0 K3 K2 K1 K0
260     //V_Cubic = K3(b - b0)^3 + K2(b - b0)^2 + K1(b - b0) + K0
261    
262    
263     //Atom1 Atom2 Quartic b0 K4 K3 K2 K1 K0
264     //V_Quartic = K4(b - b0)^4 + K3(b - b0)^3 + K2(b - b0)^2 + K1(b - b0) + K0
265    
266    
267     //Atom1 Atom2 Polynomial b0 i Ki [j Kj]
268     //V_Quartic = Ki(b - b0)^i + Kj(b - b0)^j + ...
269    
270    
271     end BondTypes
272    
273     begin BendTypes
274    
275     //Harmonic
276     //Atom1 Atom2 Atom3 Harmonic Theta0 Ktheta
277     //V_Harmonic = 0.5*Ktheta(Theta - Theta0)^2
278     //Ktheta: kcal/mole/rad**2
279     //Theta0: degrees
280     //Harmonic examples
281     //
282     //CH3 CH2 CH3 Harmonic 114.0 117.68
283     //CH3 CH2 CH2 Harmonic 114.0 117.68
284     //CH3 CH2 CH Harmonic 114.0 117.68
285     //CH3 CH CH3 Harmonic 112.0 117.68
286     //CH3 CH CH2 Harmonic 112.0 117.68
287     //CH3 CH CH Harmonic 112.0 117.68
288     //CH2 CH2 CH2 Harmonic 114.0 117.68
289     //CH2 CH2 CH Harmonic 114.0 117.68
290     CH2 CH CH2 Harmonic 112.0 117.68
291     CH2 CH CH Harmonic 112.0 117.68
292     //CH CH2 CH Harmonic 114.0 117.68
293     CH CH CH Harmonic 112.0 117.68
294    
295     //From Lubna et al.JPCB 109, 24100 (2005) TraPPE
296     CH3 CH2 SH Harmonic 96.0 67.220
297     CH2 CH2 SH Harmonic 96.0 67.220
298     CH2 CH2 S Harmonic 114.0 124.19
299     CH3 CH2 S Harmonic 114.0 124.19
300     CH3 CH2 CH3 Harmonic 114.0 124.19
301     CH3 CH2 CH2 Harmonic 114.0 124.19
302     CH2 CH2 CH2 Harmonic 114.0 124.19
303     CH3 CH2 CH Harmonic 114.0 124.19
304    
305    
306     //UreyBradley
307     //Atom1 Atom2 Atom3 UreyBradley Theta0 Ktheta S0 Kub
308     //V_UreyBradleyBend = Ktheta(Theta - Theta0)^2 + Kub(S - S0)^2
309     //Ktheta: kcal/mole/rad**2
310     //Theta0: degrees
311     //Kub: kcal/mole/A**2
312     //S0: A
313    
314     //Cubic
315     //Atom1 Atom2 Atom3 Cubic Theta0 K3 K2 K1 K0
316     //V_Cubic = K3(Theta - Theta0)^3 + K2(Theta - Theta0)^2 + K1(Theta - Theta0) + K0
317    
318     //Quartic
319     //Atom1 Atom2 Atom3 Quartic Theta0 K4 K3 K2 K1 K0
320     //V_Quartic = K4(Theta - Theta0)^4 + K3(Theta - Theta0)^3 + K2(Theta - Theta0)^2 + K1(Theta - Theta0) + K0
321    
322     //Polynomial
323     //Atom1 Atom2 Atom3 Polynomial Theta0 i Ki [j Kj]
324     //V_Polynomial = Ki(Theta - Theta0)^i + Kj(Theta - Theta0)^j + ...
325    
326     end BendTypes
327    
328     begin TorsionTypes
329    
330     // All thiol torsions from Kautman and Klein (J. Phys. Chem. 1989, 91, 4994-5001)
331    
332     //S CH2 CH2 CH3 Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
333     //S CH2 CH2 CH2 Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
334     //S CH2 CH2 CH Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
335     //S CH2 CH2 C Polynomial 0 2.218 1 2.905 2 -3.136 3 -0.7313 4 6.272 5 -7.528
336    
337     // All type 1 possibilities from Dubbeldam et al. (J. Phys. Chem. B 2004, 108, 12301-12313)
338    
339     //CH3 CH2 CH2 CH3 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
340     //CH3 CH2 CH2 CH2 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
341     //CH3 CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
342     //CH3 CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
343     //CH2 CH2 CH2 CH2 Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
344     //CH2 CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
345     //CH2 CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
346     //CH CH2 CH2 CH Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
347     //CH CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
348     //C CH2 CH2 C Polynomial 0 2.3939 1 3.871 2 -0.7111 3 -3.864 4 1.4222 5 -3.111
349    
350     // All type 2 possibilities:
351    
352     //H CH CH2 CH3 Polynomial 0 2.7167 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
353     //H CH CH2 CH2 Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
354     //H CH CH2 CH Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
355     //H CH CH2 C Polynomial 0 2.7161 1 8.665 2 0.82669 3 -12.92 4 -1.653 5 3.2712
356    
357     // All type 3 possibilities:
358    
359     //CH3 C CH2 CH3 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
360     //CH3 C CH2 CH2 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
361     //CH3 C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
362     //CH3 C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
363     //CH2 C CH2 CH2 Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
364     //CH2 C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
365     //CH2 C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
366     //CH C CH2 CH Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
367     //CH C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
368     //C C CH2 C Polynomial 0 2.5701 1 7.710 2 0 3 -10.29 4 0 5 0
369    
370     // All type 4 possibilities:
371    
372     //CH3 C C CH3 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
373     //CH3 C C CH2 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
374     //CH3 C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
375     //CH3 C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
376     //CH2 C C CH2 Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
377     //CH2 C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
378     //CH2 C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
379     //CH C C CH Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
380     //CH C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
381     //C C C C Polynomial 0 4.0652 1 12.20 2 0 3 -16.26 4 0 5 0
382    
383     //All type 5 possibilities:
384    
385     //CH3 C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
386     //CH2 C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
387     //CH C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
388     //C C CH H Polynomial 0 3.1301 1 9.390 2 0 3 -12.52 4 0 5 0
389    
390     //All type 6 possibilities:
391    
392     //H CH CH H Polynomial 0 2.1706 1 5.609 2 -1.804 3 -5.976 4 3.6089 5 -3.6089
393    
394     //Cubic
395     //Atom1 Atom2 Atom3 Atom4 Cubic k3 k2 k1 k0 ( all are kcal/mol )
396     //V_Cubic = k3(cos phi)^3 + k2(cos phi)^2 + k1(cos phi) + k0
397     //Cubic Examples
398     //CH3 CH2 CH2 CH3 Cubic 5.9602 -0.2568 -3.802 2.1586
399     CH3 CH2 CH CH3 Cubic 3.3254 -0.4215 -1.686 1.1661
400     CH3 CH CH CH3 Cubic 3.3254 -0.4215 -1.686 1.1661
401     //CH3 CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
402     CH3 CH2 CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
403     CH3 CH CH2 CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
404     CH3 CH CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
405     //CH3 CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
406     CH3 CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
407     CH3 CH CH2 CH Cubic 3.3254 -0.4215 -1.686 1.1661
408     CH3 CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
409     //CH2 CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
410     CH2 CH2 CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
411     CH2 CH CH CH2 Cubic 3.3254 -0.4215 -1.686 1.1661
412     CH2 CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
413     CH2 CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
414     CH2 CH CH2 CH Cubic 3.3254 -0.4215 -1.686 1.1661
415     CH2 CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
416     CH CH2 CH2 CH Cubic 5.9602 -0.2568 -3.802 2.1586
417     CH CH2 CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
418     CH CH CH CH Cubic 3.3254 -0.4215 -1.686 1.1661
419     //S CH2 CH2 CH2 Cubic 5.9602 -0.2568 -3.802 2.1586
420    
421     //Opls
422     //Atom1 Atom2 Atom3 Atom4 Opls v1 v2 v3
423     //V_Opls = v1 / 2 * [1 + cos(phi)] + v2 / 2 * [1 - cos(2*phi)] + v3 / 2 * [1 + cos(3*phi)]
424     //units for v_n: kcal / mol
425    
426    
427     //Trappe
428     //Atom1 Atom2 Atom3 Atom4 Trappe c0 c1 c2 c3
429     //V_Opls = c0 + c1 * [1 + cos(phi)] + c2 * [1 - cos(2*phi)] + c3 * [1 + cos(3*phi)]
430     //units for c_n: kcal / mol
431    
432     //From Martin et al. JPCB 120, 2569 (1998)
433     CH3 CH2 CH2 CH3 Trappe 0.0 0.70544 -0.13549 1.5723
434     CH3 CH2 CH2 CH2 Trappe 0.0 0.70544 -0.13549 1.5723
435     CH3 CH2 CH2 CH Trappe 0.0 0.70544 -0.13549 1.5723
436     CH2 CH2 CH2 CH2 Trappe 0.0 0.70544 -0.13549 1.5723
437    
438    
439     //From Lubna et al.JPCB 109, 24100 (2005)
440     CH3 CH2 CH2 SH Trappe 0.10507 -0.10342 0.036680 0.60874
441     CH2 CH2 CH2 SH Trappe 0.10507 -0.10342 0.036680 0.60874
442     // Thiol attached to a metal surface.
443     CH3 CH2 CH2 S Trappe 0.10507 -0.10342 0.036680 0.60874
444     CH2 CH2 CH2 S Trappe 0.10507 -0.10342 0.036680 0.60874
445     CH3 CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
446     CH2 CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
447     CH CH2 S CH2 Trappe 0.0 0.73041 -0.53685 1.1557
448     CH2 S S CH2 Trappe 3.5049 0.79083 -4.3348 1.003932
449     CH3 S S CH3 Trappe 3.5049 0.79083 -4.3348 1.003932
450     CH3 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
451     CH3 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
452     CH2 CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
453     CH CH2 CH S Trappe -0.49886 0.85189 -0.22225 0.87680
454     CH3 CH2 C S Trappe 0.0 0.0 0.0 0.91658
455     CH2 CH2 C S Trappe 0.0 0.0 0.0 0.91658
456     CH CH2 C S Trappe 0.0 0.0 0.0 0.91658
457     CH3 CG S H Trappe 0.0 0.0 0.0 0.79480
458     //From TraPPE-UA JPCB 104, 8008
459    
460     //Charmm
461     //Atom1 Atom2 Atom3 Atom4 Charmm Kchi n delta [Kchi n delta]
462     //V_Charmm = Kchi(1 + cos(n(chi) - delta))
463     //Kchi: kcal/mole
464     //n: multiplicity
465     //delta: degrees
466     //in some cases, a Charmm may have two or three terms. If n is equal to 0, it falls back to harmonic form
467    
468     //Quartic
469     //Atom1 Atom2 Atom3 Atom4 Quartic k4 k3 k2 k1 k0 ( all are kcal/mol )
470     //V_Quartic = k4(cos phi)^4 + k3(cos phi)^3 + k2(cos phi)^2 + k1(cos phi) + k0
471    
472     //Polynomial
473     //Atom1 Atom2 Atom3 Atom4 Polynomial i Ki [j Kj]
474     //VPolynomial = Ki (cos phi)^i + ... + Kj (cos phi)^j
475    
476    
477     end TorsionTypes
478    
479