Package etomica.potential

Class P2SoftSphere

java.lang.Object

etomica.potential.Potential

etomica.potential.Potential2

etomica.potential.Potential2SoftSpherical

etomica.potential.P2SoftSphere

All Implemented Interfaces:

IPotential, IPotentialAtomic, Potential2Soft, Potential2Spherical, PotentialSoft

public final class P2SoftSphere
extends Potential2SoftSpherical

Soft-sphere interatomic potential. Characterized by the pairwise-additive, spherically symmetric, inverse-power potential of the form: u(r) = epsilon*[sigma/ r]^n where epsilon: describes the strength of the pair interaction, sigma : is the atom size parameter n : is the degree of softness, s=1/n, eg: hard sphere when s=0 or n->infinity sigma/r : sig_r

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	evenN

Fields inherited from class etomica.potential.Potential

space

Fields inherited from class etomica.potential.Potential2SoftSpherical

boundary, dr, gradient

Constructor Summary

Constructors

Constructor	Description
P2SoftSphere(Space space)
P2SoftSphere(Space space, double sigma, double epsilon, int n)

Method Summary

Modifier and Type	Method	Description
double	d2u(double r2)	The second derivative of the pair energy, times the square of the separation: r^2 d^2u/dr^2.
double	du(double r2)	The derivative r*du/dr.
double	getEpsilon()	Accessor method for soft-sphere energy parameter
Dimension	getEpsilonDimension()
int	getExponent()	Accessor method for soft-sphere softness parameter
double	getSigma()	Accessor method for soft-sphere size parameter.
Dimension	getSigmaDimension()
void	setEpsilon(double eps)	Mutator method for soft-sphere energy parameter
void	setSigma(double sig)	Mutator method for soft sphere size parameter.
double	u(double r2)	The energy u.
double	uInt(double rC)	Integral used for corrections to potential truncation.

Methods inherited from interface etomica.potential.IPotential

nBody

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class etomica.potential.Potential

nBody

Methods inherited from class etomica.potential.Potential2SoftSpherical

energy, getRange, gradient, gradient, hyperVirial, integral, setBox, virial

Field Detail

evenN

protected final boolean evenN

Constructor Detail

P2SoftSphere

public P2SoftSphere(Space space)

P2SoftSphere

public P2SoftSphere(Space space,
                    double sigma,
                    double epsilon,
                    int n)

Method Detail

u

public double u(double r2)

The energy u.

Parameters:

r2 - the square of the distance between the particles.

du

public double du(double r2)

The derivative r*du/dr.

Specified by:

du in interface Potential2Soft

Specified by:

du in class Potential2SoftSpherical

d2u

public double d2u(double r2)

The second derivative of the pair energy, times the square of the separation: r^2 d^2u/dr^2.

Specified by:

d2u in class Potential2SoftSpherical

uInt

public double uInt(double rC)

Integral used for corrections to potential truncation.

Specified by:

uInt in class Potential2SoftSpherical

getSigma

public double getSigma()

Accessor method for soft-sphere size parameter.

setSigma

public final void setSigma(double sig)

Mutator method for soft sphere size parameter. Does not adjust potential cutoff for change in sigma.

getSigmaDimension

public Dimension getSigmaDimension()

getEpsilon

public double getEpsilon()

Accessor method for soft-sphere energy parameter

setEpsilon

public final void setEpsilon(double eps)

Mutator method for soft-sphere energy parameter

getEpsilonDimension

public Dimension getEpsilonDimension()

getExponent

public int getExponent()

Accessor method for soft-sphere softness parameter