Physical and Radiation Chemistry of the Positron and Positronium

Степанов, С. В.; Byakov, V. M.

doi:10.1142/9789812775610_0005

Cited by 35 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Question is the kind of process leading to Ps redistribution between them. We suppose that according to the blob model proposed by Stepanov [19], pre-positronium created in the blob can move in same limited range in the material before being trapped in the free volume. Probability of trapping in respective size of void can then be the function of voids size (radius, volume, or surface area).…”

Section: Resultsmentioning

confidence: 99%

Comparison of the free volume sizes and shapes determined from crystallographic and PALS data

Tydda

Jasińska

2015

Nukleonika

View full text Add to dashboard Cite

Abstract. Two different classes of molecular crystals were investigated. The fi rst group was benzenediols, which are characterized by the same chemical composition but a different organization of their crystallographic structures; all of the compounds from this group have only one kind of free volumes. The second class was represented by olanzapine, which has more complex chemical composition and two kinds of free volumes in the structure. The o-Ps lifetime values determined from positron annihilation lifetime spectroscopy (PALS) measurements agree quite well with those calculated for sizes found from crystallographic data for benzenediols (agreement within 10% of the lifetime values). For olanzapine, a good agreement is observed in the case of cuboidal free volumes, while for the other kind of void, the agreement is less satisfactory. Positronium diffusion coeffi cient determined from o-Ps redistribution in olanzapine agrees with these found for polymers.

show abstract

Section: Resultsmentioning

confidence: 99%

Comparison of the free volume sizes and shapes determined from crystallographic and PALS data

Tydda

Jasińska

2015

Nukleonika

View full text Add to dashboard Cite

show abstract

“…Within the current ideas of Ps formation in polymers, the spur and blob models [Stepanov and Byakov, 2003], this picture remains valid when assuming that all intrablob positrons form Ps instantaneously in its final state (localized at its ground state in a hole) and that outside blob positrons do not take part in any reaction but annihilate with their characteristic lifetime τ e+ . This general assumption seems not unreasonable since there are many (ca.…”

Section: Recapitulation Of the Assumptions Of Analysismentioning

confidence: 99%

Local Free‐Volume Distribution from PALS and Dynamics of Polymers

Dlubek

2010

Polymer Physics

View full text Add to dashboard Cite

“…Ps formation proceeds via recombination of thermalized e + with one of the knocked out electrons (it could be either e − or e − aq ) in the terminal part of the e + track [3]. Therefore in equation for e + survival probability, c p (r, t), corresponding terms are switched on by ϑ(t > t th ) multiplier † :…”

Section: Mathematical Formulation Of the Model And Results Of Calculamentioning

confidence: 99%