src/nonbonded/SC.cpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *                                                                      
 * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
 * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
 * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 */

#include <stdio.h>
#include <string.h>

#include <cmath>
#include "nonbonded/SC.hpp"
#include "utils/simError.h"
#include "types/NonBondedInteractionType.hpp"

namespace OpenMD {


  SC::SC() : name_("SC"), initialized_(false), forceField_(NULL), 
             scRcut_(0.0), np_(3000) {}
  
  RealType SC::getM(AtomType* atomType1, AtomType* atomType2) {    
    SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
    SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
    RealType m1 = sca1.getM();
    RealType m2 = sca2.getM();
    return 0.5 * (m1 + m2);
  }

  RealType SC::getN(AtomType* atomType1, AtomType* atomType2) {    
    SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
    SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
    RealType n1 = sca1.getN();
    RealType n2 = sca2.getN();
    return 0.5 * (n1 + n2);
  }

  RealType SC::getAlpha(AtomType* atomType1, AtomType* atomType2) {    
    SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
    SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
    RealType alpha1 = sca1.getAlpha();
    RealType alpha2 = sca2.getAlpha();

    ForceFieldOptions& fopts = forceField_->getForceFieldOptions();
    std::string DistanceMix = fopts.getDistanceMixingRule();
    toUpper(DistanceMix);

    if (DistanceMix == "GEOMETRIC") 
      return sqrt(alpha1 * alpha2);
    else 
      return 0.5 * (alpha1 + alpha2);
  }

  RealType SC::getEpsilon(AtomType* atomType1, AtomType* atomType2) {   
    SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
    SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
    RealType epsilon1 = sca1.getEpsilon();
    RealType epsilon2 = sca2.getEpsilon();
    return sqrt(epsilon1 * epsilon2);
  }

  void SC::initialize() { 
    // find all of the SC atom Types:
    ForceField::AtomTypeContainer* atomTypes = forceField_->getAtomTypes();
    ForceField::AtomTypeContainer::MapTypeIterator i;
    AtomType* at;

    for (at = atomTypes->beginType(i); at != NULL; 
         at = atomTypes->nextType(i)) {
      SuttonChenAdapter sca = SuttonChenAdapter(at);
      if (sca.isSuttonChen())
        addType(at);
    }    
    initialized_ = true;
  }
  
  
  void SC::addType(AtomType* atomType){

    SuttonChenAdapter sca = SuttonChenAdapter(atomType);
    SCAtomData scAtomData;
    
    scAtomData.c = sca.getC();
    scAtomData.m = sca.getM();
    scAtomData.n = sca.getN();
    scAtomData.alpha = sca.getAlpha();
    scAtomData.epsilon = sca.getEpsilon();
    scAtomData.rCut = 2.0 * scAtomData.alpha;

    // add it to the map:

    pair<map<int,AtomType*>::iterator,bool> ret;    
    ret = SClist.insert( pair<int, AtomType*>(atomType->getIdent(), atomType) );
    if (ret.second == false) {
      sprintf( painCave.errMsg,
               "SC already had a previous entry with ident %d\n",
               atomType->getIdent() );
      painCave.severity = OPENMD_INFO;
      painCave.isFatal = 0;
      simError();         
    }

    SCMap[atomType] = scAtomData;
    
    // Now, iterate over all known types and add to the mixing map:
    
    map<AtomType*, SCAtomData>::iterator it;
    for( it = SCMap.begin(); it != SCMap.end(); ++it) {
      
      AtomType* atype2 = (*it).first;
      
      SCInteractionData mixer;

      mixer.alpha = getAlpha(atomType, atype2);
      mixer.rCut = 2.0 * mixer.alpha;
      mixer.epsilon = getEpsilon(atomType, atype2);
      mixer.m = getM(atomType, atype2);
      mixer.n = getN(atomType, atype2);

      RealType dr = mixer.rCut / (np_ - 1);
      vector<RealType> rvals;
      vector<RealType> vvals;
      vector<RealType> phivals;
    
      rvals.push_back(0.0);
      vvals.push_back(0.0);
      phivals.push_back(0.0);

      for (int k = 1; k < np_; k++) {
        RealType r = dr * k;
        rvals.push_back(r);
        vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
        phivals.push_back( pow(mixer.alpha/r, mixer.m) );
      }

      mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
    
      CubicSpline* V = new CubicSpline();
      V->addPoints(rvals, vvals);
      
      CubicSpline* phi = new CubicSpline();
      phi->addPoints(rvals, phivals);
      
      mixer.V = V;
      mixer.phi = phi;

      mixer.explicitlySet = false;

      pair<AtomType*, AtomType*> key1, key2;
      key1 = make_pair(atomType, atype2);
      key2 = make_pair(atype2, atomType);
      
      MixingMap[key1] = mixer;
      if (key2 != key1) {
        MixingMap[key2] = mixer;
      }
    }      
    return;
  }
  
  void SC::addExplicitInteraction(AtomType* atype1, AtomType* atype2, 
                                  RealType epsilon, RealType m, RealType n,
                                  RealType alpha) {
    
    // in case these weren't already in the map
    addType(atype1);
    addType(atype2);

    SCInteractionData mixer;

    mixer.epsilon = epsilon;
    mixer.m = m;
    mixer.n = n;
    mixer.alpha = alpha;
    mixer.rCut = 2.0 * mixer.alpha;
    
    RealType dr = mixer.rCut / (np_ - 1);
    vector<RealType> rvals;
    vector<RealType> vvals;
    vector<RealType> phivals;
    
    rvals.push_back(0.0);
    vvals.push_back(0.0);
    phivals.push_back(0.0);
    
    for (int k = 1; k < np_; k++) {
      RealType r = dr * k;
      rvals.push_back(r);
      vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
      phivals.push_back( pow(mixer.alpha/r, mixer.m) );
    }
    
    mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
    
    CubicSpline* V = new CubicSpline();
    V->addPoints(rvals, vvals);
    
    CubicSpline* phi = new CubicSpline();
    phi->addPoints(rvals, phivals);
    
    mixer.V = V;
    mixer.phi = phi;
    
    mixer.explicitlySet = true;

    pair<AtomType*, AtomType*> key1, key2;
    key1 = make_pair(atype1, atype2);
    key2 = make_pair(atype2, atype1);
    
    MixingMap[key1] = mixer;
    if (key2 != key1) {
      MixingMap[key2] = mixer;
    }    
    return;
  }

  void SC::calcDensity(InteractionData &idat) {
    
    if (!initialized_) initialize();
    
    SCInteractionData mixer = MixingMap[ idat.atypes ];

    RealType rcij = mixer.rCut;

    if ( *(idat.rij)  < rcij) {
      RealType rho = mixer.phi->getValueAt( *(idat.rij) );
      *(idat.rho1) += rho;
      *(idat.rho2) += rho;
    } 
    
    return;
  }

  void SC::calcFunctional(SelfData &sdat) {

    if (!initialized_) initialize();

    SCAtomData data1 = SCMap[sdat.atype];
   
    RealType u = - data1.c * data1.epsilon * sqrt( *(sdat.rho) );
    *(sdat.frho) = u;
    *(sdat.dfrhodrho) = 0.5 * *(sdat.frho) / *(sdat.rho);

    (*(sdat.pot))[METALLIC_FAMILY] += u;
    *(sdat.particlePot) += u;
    
    return;
  }
  
 
  void SC::calcForce(InteractionData &idat) {
    
    if (!initialized_) initialize();
    
    SCAtomData data1 = SCMap[idat.atypes.first];
    SCAtomData data2 = SCMap[idat.atypes.second];

    SCInteractionData mixer = MixingMap[idat.atypes];

    RealType rcij = mixer.rCut;

    if ( *(idat.rij)  < rcij) {
      RealType vcij = mixer.vCut;
      
      pair<RealType, RealType> res;
      
      res = mixer.phi->getValueAndDerivativeAt( *(idat.rij) );
      RealType rhtmp = res.first;
      RealType drhodr = res.second;
      
      res = mixer.V->getValueAndDerivativeAt( *(idat.rij) );
      RealType vptmp = res.first;
      RealType dvpdr = res.second;
      
      RealType pot_temp = vptmp - vcij;
      *(idat.vpair) += pot_temp;
      
      RealType dudr = drhodr * ( *(idat.dfrho1) + *(idat.dfrho2) ) + dvpdr;
      
      *(idat.f1) += *(idat.d) * dudr / *(idat.rij) ;
        
      // particlePot is the difference between the full potential and
      // the full potential without the presence of a particular
      // particle (atom1).
      //
      // This reduces the density at other particle locations, so we
      // need to recompute the density at atom2 assuming atom1 didn't
      // contribute.  This then requires recomputing the density
      // functional for atom2 as well.
           
      *(idat.particlePot1) -= data2.c * data2.epsilon * 
        sqrt( *(idat.rho2) - rhtmp) + *(idat.frho2);

      *(idat.particlePot2) -= data1.c * data1.epsilon * 
        sqrt( *(idat.rho1) - rhtmp) + *(idat.frho1);
      
      (*(idat.pot))[METALLIC_FAMILY] += pot_temp;
    }
      
    return;    
  }

  RealType SC::getSuggestedCutoffRadius(pair<AtomType*, AtomType*> atypes) {
    if (!initialized_) initialize();   

    map<pair<AtomType*, AtomType*>, SCInteractionData>::iterator it;
    it = MixingMap.find(atypes);
    if (it == MixingMap.end()) 
      return 0.0;
    else  {
      SCInteractionData mixer = (*it).second;
      return mixer.rCut;
    }
  }
}
Revision:	1710
Committed:	Fri May 18 21:44:02 2012 UTC (12 years, 11 months ago) by gezelter
File size:	10895 byte(s)
Log Message:	Added an adapter layer between the AtomType and the rest of the code to handle the bolt-on capabilities of new types. Fixed a long-standing bug in how storageLayout was being set to the maximum possible value. Started to add infrastructure for Polarizable and fluc-Q calculations.
#	User	Rev	Content
1	gezelter	1489	/*
2			* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3			*
4			* The University of Notre Dame grants you ("Licensee") a
5			* non-exclusive, royalty free, license to use, modify and
6			* redistribute this software in source and binary code form, provided
7			* that the following conditions are met:
8			*
9			* 1. Redistributions of source code must retain the above copyright
10			* notice, this list of conditions and the following disclaimer.
11			*
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the
15			* distribution.
16			*
17			* This software is provided "AS IS," without a warranty of any
18			* kind. All express or implied conditions, representations and
19			* warranties, including any implied warranty of merchantability,
20			* fitness for a particular purpose or non-infringement, are hereby
21			* excluded. The University of Notre Dame and its licensors shall not
22			* be liable for any damages suffered by licensee as a result of
23			* using, modifying or distributing the software or its
24			* derivatives. In no event will the University of Notre Dame or its
25			* licensors be liable for any lost revenue, profit or data, or for
26			* direct, indirect, special, consequential, incidental or punitive
27			* damages, however caused and regardless of the theory of liability,
28			* arising out of the use of or inability to use software, even if the
29			* University of Notre Dame has been advised of the possibility of
30			* such damages.
31			*
32			* SUPPORT OPEN SCIENCE! If you use OpenMD or its source code in your
33			* research, please cite the appropriate papers when you publish your
34			* work. Good starting points are:
35			*
36			* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37			* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38			* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	gezelter	1665	* [4] Kuang & Gezelter, J. Chem. Phys. 133, 164101 (2010).
40			* [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
41	gezelter	1489	*/
42
43			#include <stdio.h>
44			#include <string.h>
45
46			#include <cmath>
47			#include "nonbonded/SC.hpp"
48			#include "utils/simError.h"
49			#include "types/NonBondedInteractionType.hpp"
50
51			namespace OpenMD {
52
53
54	gezelter	1502	SC::SC() : name_("SC"), initialized_(false), forceField_(NULL),
55			scRcut_(0.0), np_(3000) {}
56	gezelter	1489
57			RealType SC::getM(AtomType* atomType1, AtomType* atomType2) {
58	gezelter	1710	SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
59			SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
60			RealType m1 = sca1.getM();
61			RealType m2 = sca2.getM();
62	gezelter	1489	return 0.5 * (m1 + m2);
63			}
64
65			RealType SC::getN(AtomType* atomType1, AtomType* atomType2) {
66	gezelter	1710	SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
67			SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
68			RealType n1 = sca1.getN();
69			RealType n2 = sca2.getN();
70	gezelter	1489	return 0.5 * (n1 + n2);
71			}
72
73			RealType SC::getAlpha(AtomType* atomType1, AtomType* atomType2) {
74	gezelter	1710	SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
75			SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
76			RealType alpha1 = sca1.getAlpha();
77			RealType alpha2 = sca2.getAlpha();
78	gezelter	1489
79			ForceFieldOptions& fopts = forceField_->getForceFieldOptions();
80			std::string DistanceMix = fopts.getDistanceMixingRule();
81			toUpper(DistanceMix);
82
83			if (DistanceMix == "GEOMETRIC")
84			return sqrt(alpha1 * alpha2);
85			else
86			return 0.5 * (alpha1 + alpha2);
87			}
88
89	gezelter	1710	RealType SC::getEpsilon(AtomType* atomType1, AtomType* atomType2) {
90			SuttonChenAdapter sca1 = SuttonChenAdapter(atomType1);
91			SuttonChenAdapter sca2 = SuttonChenAdapter(atomType2);
92			RealType epsilon1 = sca1.getEpsilon();
93			RealType epsilon2 = sca2.getEpsilon();
94	gezelter	1489	return sqrt(epsilon1 * epsilon2);
95			}
96
97			void SC::initialize() {
98			// find all of the SC atom Types:
99			ForceField::AtomTypeContainer* atomTypes = forceField_->getAtomTypes();
100			ForceField::AtomTypeContainer::MapTypeIterator i;
101			AtomType* at;
102
103			for (at = atomTypes->beginType(i); at != NULL;
104			at = atomTypes->nextType(i)) {
105	gezelter	1710	SuttonChenAdapter sca = SuttonChenAdapter(at);
106			if (sca.isSuttonChen())
107	gezelter	1489	addType(at);
108			}
109			initialized_ = true;
110			}
111
112
113
114			void SC::addType(AtomType* atomType){
115
116	gezelter	1710	SuttonChenAdapter sca = SuttonChenAdapter(atomType);
117	gezelter	1489	SCAtomData scAtomData;
118
119	gezelter	1710	scAtomData.c = sca.getC();
120			scAtomData.m = sca.getM();
121			scAtomData.n = sca.getN();
122			scAtomData.alpha = sca.getAlpha();
123			scAtomData.epsilon = sca.getEpsilon();
124	gezelter	1489	scAtomData.rCut = 2.0 * scAtomData.alpha;
125
126			// add it to the map:
127
128			pair<map<int,AtomType*>::iterator,bool> ret;
129	gezelter	1710	ret = SClist.insert( pair<int, AtomType*>(atomType->getIdent(), atomType) );
130	gezelter	1489	if (ret.second == false) {
131			sprintf( painCave.errMsg,
132			"SC already had a previous entry with ident %d\n",
133	gezelter	1710	atomType->getIdent() );
134	gezelter	1489	painCave.severity = OPENMD_INFO;
135			painCave.isFatal = 0;
136			simError();
137			}
138
139			SCMap[atomType] = scAtomData;
140
141			// Now, iterate over all known types and add to the mixing map:
142
143			map<AtomType*, SCAtomData>::iterator it;
144			for( it = SCMap.begin(); it != SCMap.end(); ++it) {
145
146			AtomType* atype2 = (*it).first;
147
148			SCInteractionData mixer;
149
150			mixer.alpha = getAlpha(atomType, atype2);
151			mixer.rCut = 2.0 * mixer.alpha;
152			mixer.epsilon = getEpsilon(atomType, atype2);
153			mixer.m = getM(atomType, atype2);
154			mixer.n = getN(atomType, atype2);
155
156			RealType dr = mixer.rCut / (np_ - 1);
157			vector<RealType> rvals;
158			vector<RealType> vvals;
159			vector<RealType> phivals;
160
161			rvals.push_back(0.0);
162			vvals.push_back(0.0);
163			phivals.push_back(0.0);
164
165			for (int k = 1; k < np_; k++) {
166			RealType r = dr * k;
167			rvals.push_back(r);
168			vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
169			phivals.push_back( pow(mixer.alpha/r, mixer.m) );
170			}
171
172			mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
173
174			CubicSpline* V = new CubicSpline();
175			V->addPoints(rvals, vvals);
176
177			CubicSpline* phi = new CubicSpline();
178			phi->addPoints(rvals, phivals);
179
180			mixer.V = V;
181			mixer.phi = phi;
182
183			mixer.explicitlySet = false;
184
185			pair<AtomType, AtomType> key1, key2;
186			key1 = make_pair(atomType, atype2);
187			key2 = make_pair(atype2, atomType);
188
189			MixingMap[key1] = mixer;
190			if (key2 != key1) {
191			MixingMap[key2] = mixer;
192			}
193			}
194			return;
195			}
196
197			void SC::addExplicitInteraction(AtomType* atype1, AtomType* atype2,
198			RealType epsilon, RealType m, RealType n,
199			RealType alpha) {
200
201			// in case these weren't already in the map
202			addType(atype1);
203			addType(atype2);
204
205			SCInteractionData mixer;
206
207			mixer.epsilon = epsilon;
208			mixer.m = m;
209			mixer.n = n;
210			mixer.alpha = alpha;
211			mixer.rCut = 2.0 * mixer.alpha;
212
213			RealType dr = mixer.rCut / (np_ - 1);
214			vector<RealType> rvals;
215			vector<RealType> vvals;
216			vector<RealType> phivals;
217
218			rvals.push_back(0.0);
219			vvals.push_back(0.0);
220			phivals.push_back(0.0);
221
222			for (int k = 1; k < np_; k++) {
223			RealType r = dr * k;
224			rvals.push_back(r);
225			vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
226			phivals.push_back( pow(mixer.alpha/r, mixer.m) );
227			}
228
229			mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
230
231			CubicSpline* V = new CubicSpline();
232			V->addPoints(rvals, vvals);
233
234			CubicSpline* phi = new CubicSpline();
235			phi->addPoints(rvals, phivals);
236
237			mixer.V = V;
238			mixer.phi = phi;
239
240			mixer.explicitlySet = true;
241
242			pair<AtomType, AtomType> key1, key2;
243			key1 = make_pair(atype1, atype2);
244			key2 = make_pair(atype2, atype1);
245
246			MixingMap[key1] = mixer;
247			if (key2 != key1) {
248			MixingMap[key2] = mixer;
249			}
250			return;
251			}
252
253	gezelter	1545	void SC::calcDensity(InteractionData &idat) {
254	gezelter	1489
255			if (!initialized_) initialize();
256
257	gezelter	1571	SCInteractionData mixer = MixingMap[ idat.atypes ];
258	gezelter	1489
259	gezelter	1502	RealType rcij = mixer.rCut;
260	gezelter	1489
261	gezelter	1554	if ( *(idat.rij) < rcij) {
262	gezelter	1575	RealType rho = mixer.phi->getValueAt( *(idat.rij) );
263			*(idat.rho1) += rho;
264			*(idat.rho2) += rho;
265			}
266	gezelter	1554
267	gezelter	1489	return;
268			}
269
270	gezelter	1545	void SC::calcFunctional(SelfData &sdat) {
271	gezelter	1489
272			if (!initialized_) initialize();
273
274	gezelter	1545	SCAtomData data1 = SCMap[sdat.atype];
275	gezelter	1575
276			RealType u = - data1.c * data1.epsilon * sqrt( *(sdat.rho) );
277			*(sdat.frho) = u;
278	gezelter	1554	(sdat.dfrhodrho) = 0.5 (sdat.frho) / (sdat.rho);
279	gezelter	1575
280	gezelter	1583	(*(sdat.pot))[METALLIC_FAMILY] += u;
281	gezelter	1575	*(sdat.particlePot) += u;
282	gezelter	1489
283			return;
284			}
285	gezelter	1502
286	gezelter	1489
287	gezelter	1536	void SC::calcForce(InteractionData &idat) {
288	gezelter	1489
289			if (!initialized_) initialize();
290
291	gezelter	1571	SCAtomData data1 = SCMap[idat.atypes.first];
292			SCAtomData data2 = SCMap[idat.atypes.second];
293	gezelter	1489
294	gezelter	1571	SCInteractionData mixer = MixingMap[idat.atypes];
295	gezelter	1489
296			RealType rcij = mixer.rCut;
297
298	gezelter	1554	if ( *(idat.rij) < rcij) {
299	gezelter	1502	RealType vcij = mixer.vCut;
300
301			pair<RealType, RealType> res;
302
303	gezelter	1554	res = mixer.phi->getValueAndDerivativeAt( *(idat.rij) );
304	gezelter	1502	RealType rhtmp = res.first;
305			RealType drhodr = res.second;
306
307	gezelter	1554	res = mixer.V->getValueAndDerivativeAt( *(idat.rij) );
308	gezelter	1502	RealType vptmp = res.first;
309			RealType dvpdr = res.second;
310
311			RealType pot_temp = vptmp - vcij;
312	gezelter	1554	*(idat.vpair) += pot_temp;
313	gezelter	1502
314	gezelter	1554	RealType dudr = drhodr * ( (idat.dfrho1) + (idat.dfrho2) ) + dvpdr;
315	gezelter	1502
316	gezelter	1554	(idat.f1) += (idat.d) * dudr / *(idat.rij) ;
317	gezelter	1489
318	gezelter	1575	// particlePot is the difference between the full potential and
319			// the full potential without the presence of a particular
320	gezelter	1502	// particle (atom1).
321			//
322	gezelter	1575	// This reduces the density at other particle locations, so we
323			// need to recompute the density at atom2 assuming atom1 didn't
324			// contribute. This then requires recomputing the density
325			// functional for atom2 as well.
326
327			(idat.particlePot1) -= data2.c data2.epsilon *
328			sqrt( (idat.rho2) - rhtmp) + (idat.frho2);
329
330	gezelter	1586	(idat.particlePot2) -= data1.c data1.epsilon *
331	gezelter	1575	sqrt( (idat.rho1) - rhtmp) + (idat.frho1);
332	gezelter	1489
333	gezelter	1582	(*(idat.pot))[METALLIC_FAMILY] += pot_temp;
334	gezelter	1502	}
335
336	gezelter	1489	return;
337			}
338	gezelter	1505
339	gezelter	1545	RealType SC::getSuggestedCutoffRadius(pair<AtomType, AtomType> atypes) {
340	gezelter	1505	if (!initialized_) initialize();
341	gezelter	1545
342	gezelter	1505	map<pair<AtomType, AtomType>, SCInteractionData>::iterator it;
343	gezelter	1545	it = MixingMap.find(atypes);
344	gezelter	1505	if (it == MixingMap.end())
345			return 0.0;
346			else {
347			SCInteractionData mixer = (*it).second;
348			return mixer.rCut;
349			}
350			}
351	gezelter	1489	}