gov.nist.microanalysis.EPQLibrary
Class CzyzewskiMottScatteringAngle

java.lang.Object
  gov.nist.microanalysis.EPQLibrary.CzyzewskiMottScatteringAngle

All Implemented Interfaces:

IRandomizedScatter

public class CzyzewskiMottScatteringAngle
extends java.lang.Object
implements IRandomizedScatter

A class to compute a randomized scattering angle for an electron with a specified energy. The angles are distributed according to the the Mott partial cross section model as implemented by Czyzewski. Since this algorithm is only implemented up to 30 keV and since the Mott cross section approaches the screened Rutherford model, this class uses the ScreenedRutherfordScatteringAngle algorithm about 30 keV (MAX_CZYZEWSKI)

Copyright: Pursuant to title 17 Section 105 of the United States Code this software is not subject to copyright protection and is in the public domain

Company: National Institute of Standards and Technology

Version:

1.0

Author:

Nicholas W. M. Ritchie

Field Summary

static double

MAX_CZYZEWSKI

Constructor Summary

CzyzewskiMottScatteringAngle(Element el)
MottScatteringAngle - Creates a MottScatteringAngle object for the specified element.

Method Summary

Element	getElement() getElement - Returns the element with which this cross section is associated.
double	meanFreePath(double energy) meanFreePath - Calculates the mean free path at the specified energy by interpolating between tabulated values.
double	randomScatteringAngle(double energy) scatteringAngle - Same as scatteringAngle(energy,rand) except that this function automatically selects a random \ number.
double	randomScatteringAngle(double energy, double rand) scatteringAngle - Given a random number, rand on the interval [0,1), and an energy (in Joules), this function returns a scattering angle.
java.lang.String	toString() toString
double	totalCrossSection(double energy) totalCrossSection - Calculates the total cross section at the specified energy by interpolating between tabulated values.

Methods inherited from class java.lang.Object

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

Field Detail

MAX_CZYZEWSKI

public static final double MAX_CZYZEWSKI

Constructor Detail

CzyzewskiMottScatteringAngle

public CzyzewskiMottScatteringAngle(Element el)

MottScatteringAngle - Creates a MottScatteringAngle object for the specified element.

Parameters:

el - Element

Throws:

java.lang.Exception - - When a Mott cross section table is unavailable or corrupted

Method Detail

toString

public java.lang.String toString()

toString

Overrides:

toString in class java.lang.Object

Returns:

(non-Javadoc)

See Also:

Object.toString()

getElement

public Element getElement()

Description copied from interface: IRandomizedScatter

getElement - Returns the element with which this cross section is associated.

Specified by:

getElement in interface IRandomizedScatter

Returns:

Element

randomScatteringAngle

public double randomScatteringAngle(double energy,
                                    double rand)

scatteringAngle - Given a random number, rand on the interval [0,1), and an energy (in Joules), this function returns a scattering angle.

Parameters:

energy - double - In Joules

rand - double - On [0,1)

Returns:

double

randomScatteringAngle

public double randomScatteringAngle(double energy)

scatteringAngle - Same as scatteringAngle(energy,rand) except that this function automatically selects a random \ number.

Specified by:

randomScatteringAngle in interface IRandomizedScatter

Parameters:

energy - double - In Joules

Returns:

double

meanFreePath

public double meanFreePath(double energy)

meanFreePath - Calculates the mean free path at the specified energy by interpolating between tabulated values.

Parameters:

energy - double - In Joules

Returns:

double

totalCrossSection

public double totalCrossSection(double energy)

totalCrossSection - Calculates the total cross section at the specified energy by interpolating between tabulated values.

Specified by:

totalCrossSection in interface IRandomizedScatter

Parameters:

energy - double - In Joules

Returns:

double