Reflectivity software
Motofit is a program (running in IGOR Pro) that performs least squares fitting of X-ray and neutron reflectometry data using Genetic Optimization and Levenberg Marquardt.
Nelson, A. (2006). "Co-refinement of multiple contrast neutron / X-ray reflectivity data using MOTOFIT." Journal of Applied Crystallography 39: 273-276.
http://motofit.sourceforge.net/
It was written by Andrew Nelson, of the Australian Nuclear Science and Technology Organisation (ANSTO), and is licenced via the GNU general public licence.
The XOP available for download here is a plugin that fits into IGOR. It calculates reflectivities using the Abeles matrix method. MOTOFIT can use this plugin, thus speeding up analysis considerably (although Motofit can run without it).
Windows version:
compiled on XP Professional with Microsoft VC++6.
Macintosh version:
AbelesXOP_MacOSX.dmg - Distributed as a disc image, Mount the disk image by double clicking it once it is downloaded (your browser may do this automatically). Copy the contents to the Igor Extensions folder. Thanks to Andrew Jackson (NCNR NIST) for compiling this version. Compiled on a Macbook Pro, as a universal binary (suitable for PPC and Intel).
There are a few licence conditions:
Abeles.xop is a program that calculate reflectivity values in IGOR Pro: written by Andrew Nelson
Copyright (C) 2006 Andrew Nelson and Australian Nuclear Science and Technology Organisation
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Whilst is has been tested, it is the users responsibility to check for potential inaccuracies in the function calculation. If you use this plugin to analyse data that is then published please cite the original Motofit paper.
For further details (and if you want the sourcecode) please contact:
Andrew_Nelson@users.sourceforge.net