Seeking the Good Fitting Procedure of PALS Polymer Spectra
Positron annihilation lifetime measurements on polymethylmethacrylate (PMMA) at low temperature were performed. Different discrete fitting procedures have been used to analyze the experimental data. It shows that the extracted parameters depend strongly on the fitting procedure. The physical meaning of the results is discussed. The blob model seems to give the best annihilation parameters.
S. J. Wang, Z. Q. Chen, B. Wang and Y. C. Jean
N. Laforest et al., "Seeking the Good Fitting Procedure of PALS Polymer Spectra", Materials Science Forum, Vol. 607, pp. 64-66, 2009