POSITRON ANNIIHILATION LIFETIME SPECTROSCOPY Fundamentals and applications Bożena Jasińska Institute of Physics Maria Curie Sklodowska University II SYMPOSIUM.

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Presentation transcript:

POSITRON ANNIIHILATION LIFETIME SPECTROSCOPY Fundamentals and applications Bożena Jasińska Institute of Physics Maria Curie Sklodowska University II SYMPOSIUM ON APPLIED NUCLEAR PHYSICS AND INNOVATIVE TECHNOLOGIES Jagiellonian University, Kraków, September , 2014

+ _ 511 keV Annihilation

outline 1.POSITRON AND POSITRONIUM 2.ETE MODEL 3.EXPERIMENTAL SETUP 4.METALS AND OXIDES 5.PHASE TRANSITION IN POLYMERS 6.POROUS MATERIALS

+ _ 511 keV Annihilation

POSITRONIUM in the vacuum  = 125 ps p-Ps = (7,98950 ± 0,00002) ns -1  = 142 ns o-Ps = (7,03993 ± 0,00001) ms -1 PARAPOSITRONIUM ORTOPOSITRONIUM

POSITRONINUM IN THE MATTER

POSITRONIUM in the condensed matter thermallization Processes leading to o-Ps lifetime shortening: - ortho-para conversion - quenching - pick-off

POSITRONIUM in the condensed matter pick- off process Shortening of the o-Ps lifetime value: 1 to 142 ns

1  λ po =λ b P Dependence of the mean o-Ps lifetime value on the free volume size and shape POSITRONIUM in the condensed matter

Porous materials

EXCITED STATES Spherical potential well Porous materials

Decay constant for nl-th state, spherical shape: Decay constanst of pick-off process (averaged over all populated states) : ETE model Decay constant of nm-th state, cyllindrical shape: Porous materials

PALS vs LN Porous materials

2.6y 3.7ps  %, EC 9.5%  %  PALS Positron Annihilation Lifetime Spectroscopy 1274 keV511 keV tt 1274 keV counts Channel number (energy )

PAL spectrometer

Lifetime spectrum

Spectrum analysis – convolution („LT”) J. Kansy, Nucl. Instr. Methods A 374, 235 (1996). Time, ns counts

examples

Fitted components: 2. Intensity of i-th component (I) 1.Mean lifetime value (  ) Defected metal time counts Nondefected metal

CYTOP Glass transition T=108 0 C M. Śniegocka, PhD Thesis, Lublin 2010 POLYMERS

Phase transition in alkanes C 13 H 28 C 15 H 32 C 17 H 36 C 19 H 40 B. Zgardzińska, PhD Thesis, Lublin 2008

Low-k materials pollution sorption photonics Porous materials

R = 0.99 nm R = 1.55 nm R = 2.38 nm PHOTON ACTIVE GLASSES Porous materials

MCM-41 Porous materials [1] R. Zaleski, PhD thesis, Lublin (2005)

1 - PG, 2 – PG + dye 3 – PG + AgNPs Porous materials

Thank you for your attention