CDBTools - Evaluate Positron Annihilation Coincidence Doppler Broadening Spectrum

Abstract

CDBTools is a lightweight and easy to use application designed to provide you with an analysis tool for coincidence Doppler broadening (CDB) of the positron annihilation energy spectrum files. This application enables you to analyze the CDB and ratio curves, plots as well as graphs representing the evolution of the orbital electron momentum spectrum. The CDB extraction is provided by selectable filters applied at the diagonal line of the input matrix. To achieve CDB ratio curves with minimal error caused by 511keV peak shift, spectrum curves are recalculated by penalized regression spline.

Development of a 2D digital Coincidence Doppler Broadening Spectrometer

“…This zero shift can also be made from the middle of the Gaussian approximation throw the middle of the spectra bin which is discrete. To remedy this effect, a penalized spline function provided by CDBTools code is applied to all spectra and the value of zero line shift is compensated for each spectrum [19]. Moreover, a routine smoothing procedure is applied to the data for compensation of the harmful effect of the low statistics at high momentum part of the spectrum.…”

First-Principles Study on Positron States at Li-Adsorbed Al(100) Surfaces: Effect of Electron-Positron Correlation

“…The data of E a is not shown here. E a is calculated as E a = E b + Φ − − 6.8eV [5,11], and is 0.48, -0.32, and -0.48 eV for clean, 0.25 ML, and 0.50 ML Al(100) surfaces, respectively. The E a of the clean surface, 0.48 eV, agrees well with the experimental value, 0.46 eV [9].…”

Positron Annihilation Spectroscopy Study of Metallic Materials after High-Speed Cutting

“…The obtained DBS spectra were analyzed by extracting the S and W parameters. These parameters were obtained by processing the spectra in the CDBTools software [ 32 ]. To analyze the two-dimensional spectrum, relative curves were plotted as R(E) = N(E)/N 0 (E), where N(E) is the spectrum of the sample under study and N 0 (E) is the spectrum of the reference sample.…”