MODEL

Lorentz

AUTHOR/MODIFICATION

John Barker 10 FEB 1999

Alan Munter 08 JULY 1999, converted to Java

APPROVED FOR DISTRIBUTION

DESCRIPTION

Model describes a Lorentzian (Ornstein-Zernicke) including a flat background.

Resolution smeared version is also provided.

VARIABLES

Input Variables (default values):

Parameter | Variable | Value |
---|---|---|

0 | Scale | 100.0 |

1 | Screening Length (Å) | 50.0 |

2 | Incoherent Background (cm^{-1}) | 0.0 |

**USAGE** **NOTES**

The function calculated is:

where I_{0} is the scale factor and corresponds to the
scattered intensity at *q*=0.0.

REFERENCE

TEST DATASET

This example dataset is produced by calculating the Lorentz using
300 data points, *q*_{min} = 0.001 Å^{-1},
*q*_{max} = 0.7 (Å^{-1}) and the above default
parameter values.