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[Licence| Download | New Version Template] ackx_v1_0.gz(38 Kbytes)
Manuscript Title: PFPOSFIT: a new version of a program for analysing positron lifetime spectra with non-Gaussian prompt curve.
Authors: W. Puff
Program title: PFPOSFIT
Catalogue identifier: ACKX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 30(1983)359
Programming language: Fortran.
Computer: UNIVAC 1100/81.
Program overlaid: yes
RAM: 50K words
Word size: 36
Keywords: Solid state physics, Time spectrum, Least-squares, Fitting, Positron annihilation, Lifetime, Convolution, Minimization, Sum-of-exponentials, Marquardt, Constraints, Correlation matrix, Experiment.
Classification: 7.4.

Other versions:
Cat Id Title Reference
AAGK_v1_0 POSITRONFIT CPC 3(1972)240
AAGX_v1_0 POSITRONFIT EXTENDED CPC 7(1974)401
AAGZ_v1_0 DBLCON CPC 13(1978)371
AAHI_v1_0 INTERACTIVE POSITRONFIT CPC 15(1978)97
AANN_v1_0 PATFIT CPC 23(1981)307

Nature of problem:
A measured positron lifetime spectrum consists of a sum of exponential decay components smeared with the instrumental resolution function. Experimenters want to extract the life times and intensities of the different components.

Solution method:
Positron lifetime spectra are analyzed by a semilinear least-squares technique.

Restrictions:
Five lifetime components, two expotentials in the prompt, 512 channels in the spectrum.

Running time:
The test run requires about 31 s CPU time on the UNIVAC 1100/81.