FreqFlucCorrFunc.cpp

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 * 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, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#include "applications/dynamicProps/FreqFlucCorrFunc.hpp"
 
#include <string>
 
#include "applications/dynamicProps/TimeCorrFunc.hpp"
#include "brains/SimInfo.hpp"
#include "math/Vector3.hpp"
#include "primitives/Atom.hpp"
#include "primitives/StuntDouble.hpp"
#include "types/MultipoleAdapter.hpp"
#include "utils/StringUtils.hpp"
#include "utils/simError.h"
 
namespace OpenMD {
 
  FreqFlucCorrFunc::FreqFlucCorrFunc(SimInfo* info, const std::string& filename,
                                     const std::string& sele1,
                                     const std::string& sele2) :
      ObjectACF<RealType>(info, filename, sele1, sele2) {
    setCorrFuncType("FreqFluc Correlation Function");
    setOutputName(getPrefix(dumpFilename_) + ".ffcorr");
  }
 
  int FreqFlucCorrFunc::computeProperty1(int frame, StuntDouble* sd) {
    Vector3d e = sd->getElectricField();
    Vector3d u;
    if (sd->isRigidBody()) {
      u = sd->getA().getRow(2);
    } else {
      AtomType* at        = static_cast<Atom*>(sd)->getAtomType();
      MultipoleAdapter ma = MultipoleAdapter(at);
 
      if (ma.isDipole()) { u = sd->getDipole(); }
    }
 
    RealType uedot = dot(u, e);
    ueStats_.add(uedot);
 
    ue_[frame].push_back(uedot);
    return ue_[frame].size() - 1;
  }
 
  RealType FreqFlucCorrFunc::calcCorrVal(int frame1, int frame2, int id1,
                                         int id2) {
    RealType mean = ueStats_.getAverage();
 
    return (ue_[frame1][id1] - mean) * (ue_[frame2][id2] - mean);
  }
 
  void FreqFlucCorrFunc::validateSelection(SelectionManager&) {
    StuntDouble* sd;
    int i;
    for (sd = seleMan1_.beginSelected(i); sd != NULL;
         sd = seleMan1_.nextSelected(i)) {
      if (!sd->isRigidBody()) {
        AtomType* at        = static_cast<Atom*>(sd)->getAtomType();
        MultipoleAdapter ma = MultipoleAdapter(at);
 
        if (!ma.isDipole()) {
          snprintf(
              painCave.errMsg, MAX_SIM_ERROR_MSG_LENGTH,
              "FreqFlucCorrFunc::validateSelection Error: selection is not a "
              "RigidBody "
              "or does\n"
              "\tnot have a dipole\n");
          painCave.isFatal = 1;
          simError();
        }
      }
    }
  }
}  // namespace OpenMD