Open AccessANALYSIS OF POSITRON ANNIHILATION LIFETIME SPECTRUM BY FAST FOURIER TRANSFORM
Author(s) -
Jie Ma,
Guo Yinghuan,
Yunyu Wang
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.547
Subject(s) - annihilation , fast fourier transform , fourier transform , spectrum (functional analysis) , resolution (logic) , physics , function (biology) , computational physics , computer science , nuclear physics , algorithm , quantum mechanics , artificial intelligence , evolutionary biology , biology
This work is the first attempt to decompose the positron annihilation lifetime spectrum into the form of a frequency spectrum by Fast Fourier Transform (FFT) technique. Each real peak in the frequency spectrum indicates a lifetime component. The peak position corresponds to the annihilation constants, the peak area is proportional to the intensity of the component. The principle of this method is described in this paper. We thoughtfully consider the effects of the instrumental resolution function and the statistical error. A program is compiled with Turbo C and successfully operated on PC ALR-286. The analysis results for some simulated spectrum are satisfactory. The work indicates that the advantages of this method are its simplicity, rapidity, less effect of the instrument resolution function and no guessing what the components are before analysis.