TetrahedralityParam.hpp

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 *
 * [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).
 */
 
#ifndef APPLICATIONS_STATICPROPS_TETRAHEDRALITYPARAM_HPP
#define APPLICATIONS_STATICPROPS_TETRAHEDRALITYPARAM_HPP
 
#include "applications/staticProps/StaticAnalyser.hpp"
#include "math/Vector3.hpp"
#include "selection/SelectionEvaluator.hpp"
#include "selection/SelectionManager.hpp"
 
namespace OpenMD {
 
  /**
   * @class TetrahedralityParam
   * @brief Tetrahedrality Parameter
   *
   * Computes local tetrahedral order parameter Q as introduced in:
   *
   *   "A new order parameter for tetrahedral configurations," by P.-L. Chau and
   *    A.J. Hardwick, Mol. Phys. 93, pp. 511-518 (1998).
   *
   *
   * Note that we use a rescaled version of the tetrahedral order
   * parameter 'Q' such that a perfectly tetrahedral configuration has a Q value
   * of 1 and an ideal gas configuration has a Q value of 0. This rescaled
   * version of the tetrahedrality parameter was first introduced in:
   *
   *   "Relationship between structural order and the anomalies of liquid
   * water," by J.R. Errington and P.G. Debenedetti, Nature 409, pp. 318-321
   * (2001).
   *
   *
   * Characterization of the spatial correlations of the the local order
   * parameter Q are done according to the procedure outlined in:
   *
   *   "Space-time correlations in the orientational order parameter and the
   *    orientational entropy of water," by P. Kumar, S.V. Buldyrev, and H.E.
   * Stanley, arXiv:0807.4699v1 [cond-mat.soft] 29 Jul 2008.
   *
   */
  class TetrahedralityParam : public StaticAnalyser {
  public:
    TetrahedralityParam(SimInfo* info, const std::string& filename,
                        const std::string& sele, double rCut, int nbins);
 
    virtual void process();
 
  private:
    virtual void initializeHistogram();
    virtual void collectHistogram(RealType Qk);
    void writeOrderParameter();
 
    Snapshot* currentSnapshot_;
    std::string selectionScript_;
    SelectionManager seleMan_;
    SelectionEvaluator evaluator_;
 
    RealType rCut_;
    int frameCounter_;
    int nBins_;
 
    RealType MinQ_;
    RealType MaxQ_;
    RealType deltaQ_;
    std::vector<int> Q_histogram_;
    std::vector<StuntDouble*> Distorted_;
    std::vector<StuntDouble*> Tetrahedral_;
  };
}  // namespace OpenMD
 
#endif