PLRF Code for Decomposition of Positron Lifetime Spectra

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421631" target="_blank" >RIV/00216208:11320/20:10421631 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=CgEYKlHTCj" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=CgEYKlHTCj</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12693/APhysPolA.137.177" target="_blank" >10.12693/APhysPolA.137.177</a>

Jazyk výsledku

angličtina

Název v původním jazyce

PLRF Code for Decomposition of Positron Lifetime Spectra

Popis výsledku v původním jazyce

A new code PLRF (version 19) was developed for decomposition of positron lifetime spectra. The PLRF code is based on the least squares fitting of positron lifetime spectra and utilizes a minimization routine MINUIT from the ROOT package developed at CERN. Multiple positron lifetime spectra can be fitted simultaneously using the PLRF code. Each fitting parameter can be selected to be either common (i.e., the same value for all spectra) or individual (i.e., different values for each spectrum). Positronium (Ps) contribution is considered as a double exponential component consisting of short lived para-positronium (p-Ps) and long lived ortho-positronium (o-Ps) component. Ratio of o-Ps and p-Ps contribution can be constrained. Several models were implemented into the PLRF code: independent exponential components, simple trapping model, and diffusion trapping model. Physically relevant parameters of the model are varied to get best agreement with experimental positron lifetime spectra. As a consequence the user obtains physically meaningful parameters from fitting, e.g., positron trapping rates in the case of the simple trapping model, grain or cell size and dislocation density in the case of the diffusion trapping model, etc.

Název v anglickém jazyce

PLRF Code for Decomposition of Positron Lifetime Spectra

Popis výsledku anglicky

A new code PLRF (version 19) was developed for decomposition of positron lifetime spectra. The PLRF code is based on the least squares fitting of positron lifetime spectra and utilizes a minimization routine MINUIT from the ROOT package developed at CERN. Multiple positron lifetime spectra can be fitted simultaneously using the PLRF code. Each fitting parameter can be selected to be either common (i.e., the same value for all spectra) or individual (i.e., different values for each spectrum). Positronium (Ps) contribution is considered as a double exponential component consisting of short lived para-positronium (p-Ps) and long lived ortho-positronium (o-Ps) component. Ratio of o-Ps and p-Ps contribution can be constrained. Several models were implemented into the PLRF code: independent exponential components, simple trapping model, and diffusion trapping model. Physically relevant parameters of the model are varied to get best agreement with experimental positron lifetime spectra. As a consequence the user obtains physically meaningful parameters from fitting, e.g., positron trapping rates in the case of the simple trapping model, grain or cell size and dislocation density in the case of the diffusion trapping model, etc.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GA18-09347S" target="_blank" >GA18-09347S: Černé kovy a jejich použití pro senzory plynů na bázi křemenné krystalové mikrováhy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Physica Polonica A

ISSN

0587-4246

e-ISSN

—

Svazek periodika

137

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

11

Strana od-do

177-187

Kód UT WoS článku

000529332100025

EID výsledku v databázi Scopus

2-s2.0-85083816889