<commit_before>
package etomica.potential;
import etomica.space.ISpace;
import etomica.space.Space;
import etomica.space3d.Space3D;
import etomica.units.BohrRadius;
import etomica.units.Hartree;
import etomica.units.Kelvin;

/**
 * 
 * Ab initio pair potential for helium from Przybytek et al. (2010) Phys. Rev. Lett. 104, 183003.  This is a true pair potential, rather than a pairwise-additive potential.
 * 
 * In this class, only the pair potential is the second derivative is valid.  
 *
 * @author <NAME>
 */
public class P2HePCKLJS extends Potential2SoftSpherical {
    
    public P2HePCKLJS(ISpace space) {
        super(space);

        double W4 = 0.35322e-04/(alpha*alpha);
        double AS3= 0.577235e-06/(alpha*alpha*alpha);
        double polarizability = 1.38319217440;

        double K7 = 23.0/(4.0*Math.PI)*polarizability*polarizability/alpha;
        double ratio = alpha*K7/C6BO;

        B = new double[7];
        B[1] = 8.454943177941253;
    	B[2] = 16.006586066260556;
    	B[3] = 10.378373954734820;
    	B[4] = 3.515803817223855;
    	B[5] = 0.591502377533792;<commit_msg>minor edit<commit_after>
package etomica.potential;
import etomica.space.ISpace;
import etomica.space.Space;
import etomica.space3d.Space3D;
import etomica.units.BohrRadius;
import etomica.units.Hartree;
import etomica.units.Kelvin;

/**
 * 
 * Ab initio pair potential for helium from Przybytek et al. (2010) Phys. Rev. Lett. 104, 183003.  This is a true pair potential, rather than a pairwise-additive potential.
 * 
 * The second derivative has not yet been included.  
 *
 * @author <NAME>
 */
public class P2HePCKLJS extends Potential2SoftSpherical {
    
    public P2HePCKLJS(ISpace space) {
        super(space);

        double W4 = 0.35322e-04/(alpha*alpha);
        double AS3= 0.577235e-06/(alpha*alpha*alpha);
        double polarizability = 1.38319217440;

        double K7 = 23.0/(4.0*Math.PI)*polarizability*polarizability/alpha;
        double ratio = alpha*K7/C6BO;

        B = new double[7];
        B[1] = 8.454943177941253;
    	B[2] = 16.006586066260556;
    	B[3] = 10.378373954734820;
    	B[4] = 3.515803817223855;
    	B[5] = 0.591502377533792;
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