|DTU Risø Campus|
PALSfit3 is composed of two modules for fitting of positron lifetime spectra, PositronFit and ResolutionFit. In both fitting modules a model function will be fitted to a measured lifetime spectrum. This model function consists of a function representing the physics of the positron decay, which is convoluted with the experimental time resolution function, plus a constant background. The 'physics function' consists of a sum of decaying exponentials each of which may be broadened by convolution with a log-normal distribution. The time resolution function is described by a sum of Gaussians which may be displaced with respect to each other. Various types of constraints may be imposed on the fitting parameters.
In the PositronFit module, the fitting parameters to be extracted from a measured spectrum are for each lifetime component its mean lifetime and its broadening as well as its intensity. A correction for positrons annihilating outside the sample can be made as part of the analysis.
In the ResolutionFit module, parameters determining the shape of the time resolution function can be fitted. The extracted resolution function may then be used in PositronFit.
The main results will be displayed in a text window. In addition graphics displays are provided to ease the selection of some of the input parameters and to display results of spectrum analyses.
PALSfit3 is verified on Windows-XP and Windows 7, 8 and 10.
To be able to run the PALSfit3 program, a license key is required.
If you have already obtained a license key for PALSfit, you may use it for PALSfit3 (no extra charge).
To obtain a license key for the first time, please print the standard PALSfit License Agreement, fill it out, sign it and send a scanned copy as e-mail or post it to:
phone: +45 4677 5728
You will then receive the license key by e-mail. An invoice will be sent to you later.
The PATFIT program package (without the GUI interface) is available for licensed users upon request.
The PALSfit license admits at any time installation and execution of all new updates of PALSfit3.
Install Demo Version (PALSfit3_demo version 3.171)
Webmaster 13. june 2018