Positron Lifetime Spectroscopy on Selected Polymers
Title | Positron Lifetime Spectroscopy on Selected Polymers PDF eBook |
Author | Ronghai Wang |
Publisher | |
Pages | 210 |
Release | 1992 |
Genre | |
ISBN |
Positron Lifetime Spectroscopy for Investigation of Thin Polymer Coatings
Title | Positron Lifetime Spectroscopy for Investigation of Thin Polymer Coatings PDF eBook |
Author | Jag J. Singh |
Publisher | |
Pages | 12 |
Release | 1993 |
Genre | Coatings |
ISBN |
Measurements of Microscopic Voids in Polymers Using Positron Annihilation Lifetime Spectroscopy
Title | Measurements of Microscopic Voids in Polymers Using Positron Annihilation Lifetime Spectroscopy PDF eBook |
Author | Li Xie |
Publisher | |
Pages | 510 |
Release | 1995 |
Genre | |
ISBN |
Relaxation Behavior of Polymers Probed by Positron Annihilation Lifetime Spectroscopy
Title | Relaxation Behavior of Polymers Probed by Positron Annihilation Lifetime Spectroscopy PDF eBook |
Author | Takenori Suzuki |
Publisher | |
Pages | 19 |
Release | 2002 |
Genre | |
ISBN |
Analysis of Positron Lifetime Spectra in Polymers
Title | Analysis of Positron Lifetime Spectra in Polymers PDF eBook |
Author | Jag G. Singh |
Publisher | |
Pages | 68 |
Release | 1988 |
Genre | Least squares |
ISBN |
Characterization of Free-volume Properties in Polymers by Positron Annihilation Spectroscopy
Title | Characterization of Free-volume Properties in Polymers by Positron Annihilation Spectroscopy PDF eBook |
Author | Qin Deng |
Publisher | |
Pages | 320 |
Release | 1993 |
Genre | Polymers |
ISBN |
Analysis of Positron Lifetime Spectra in Polymers
Title | Analysis of Positron Lifetime Spectra in Polymers PDF eBook |
Author | National Aeronautics and Space Administration (NASA) |
Publisher | Createspace Independent Publishing Platform |
Pages | 64 |
Release | 2018-07-06 |
Genre | |
ISBN | 9781722234904 |
A new procedure for analyzing multicomponent positron lifetime spectra in polymers was developed. It requires initial estimates of the lifetimes and the intensities of various components, which are readily obtainable by a standard spectrum stripping process. These initial estimates, after convolution with the timing system resolution function, are then used as the inputs for a nonlinear least squares analysis to compute the estimates that conform to a global error minimization criterion. The convolution integral uses the full experimental resolution function, in contrast to the previous studies where analytical approximations of it were utilized. These concepts were incorporated into a generalized Computer Program for Analyzing Positron Lifetime Spectra (PAPLS) in polymers. Its validity was tested using several artificially generated data sets. These data sets were also analyzed using the widely used POSITRONFIT program. In almost all cases, the PAPLS program gives closer fit to the input values. The new procedure was applied to the analysis of several lifetime spectra measured in metal ion containing Epon-828 samples. The results are described. Singh, Jag J. and Mall, Gerald H. and Sprinkle, Danny R. Goddard Space Flight Center; Langley Research Center...