Positronium in large voids. Silicagel

Goworek, T.; Ciesielski, K.; Jasińska, B.; Wawryszczuk, J.

doi:10.1016/s0009-2614(97)00504-6

Cited by 75 publications

(53 citation statements)

References 9 publications

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“…One of attempts to improve the consistency of the model and experiment was done by Shantarovich et al [196], modifying the shape of potential well (rectangular, but deepened near the walls). More realistic approach consists in taking into account the population by Ps the energy levels in the potential well, lying higher than the ground level [197,198]. With the increase of free volume radii, besides the zero-point level, also other levels begin to appear and in favourable conditions become populated.…”

Section: The Role Of Excited Statesmentioning

confidence: 99%

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Positronium as a probe of small free volumes in crystals, polymers and porous media

Goworek¹

2014

Annales UMCS, Chemia

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Section: The Role Of Excited Statesmentioning

confidence: 99%

“…69 for porous Amberlite. Accounting the Ps annihilation from higher levels in the well [197], PALS and related techniques opened a new method of porosimetry.…”

Section: The Role Of Excited Statesmentioning

confidence: 99%

Positronium as a probe of small free volumes in crystals, polymers and porous media

Goworek¹

2014

Annales UMCS, Chemia

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“…Fig. 2B shows how Eq.9 (broken line) breaks at large pores for which annihilation from higher levels, amounting to several tens in number, must be taken into account 26) .…”

Section: Ps Lifetime In Vacanciesmentioning

confidence: 99%

Vacancy Spectroscopy Using Positronium

Ito¹,

Mohamed

Shantarovich

et al. 2009

membrane

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Positron annihilation technique as a probe of subatomic vacancies is described for non-positron polymer scientists.Although positronium (Ps) is an unparalleled unique probe of inter-molecular vacancies in insulating materials, with both its intensity and mean lifetime carrying information about the free volume, the processes that lead to these physical quantities are not simple. The state-of-the-art understandings of how Ps is created and how its mean lifetime is determined in vacancies are described, and examples of the unique feature as well as the problems and precautions are illustrated.

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“…The two-particle model lifetime is also longer than that of a SPIB with m = 2m e in the same pore. (Comparing equal masses is important -mass determines the admixture of excited states at finite temperature [6,7,31]. ) Lifetime decreases with temperature as one would expect as excited states enhance density near the wall.…”

Section: Beyond Spibmentioning

confidence: 99%

Simulation of positronium: Toward more realistic models of void spaces in materials

Bug

Cronin

Sterne

et al. 2007

Radiation Physics and Chemistry

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An exact treatment of the positron and electron in a two-chain, Path Integral Monte Carlo (PIMC) simulation is used to calculate both self-annihilation and pickoff rates at finite temperature. It has already been demonstrated that this technique can reproduce and extend results of simple theories of positrons and positronium (Ps) in spherical voids. Here, we include the effect of the linear dielectric response of a homogeneous material on the annihilation rate of positrons and Ps. In addition, we find lifetimes and structural information for Ps in cylindrical channels, both with and without adsorbed fluid atoms.

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Positronium in large voids. Silicagel

Cited by 75 publications

References 9 publications

Positronium as a probe of small free volumes in crystals, polymers and porous media

Positronium as a probe of small free volumes in crystals, polymers and porous media

Vacancy Spectroscopy Using Positronium

Simulation of positronium: Toward more realistic models of void spaces in materials

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