Frontiers of positron and positronium chemistry in condensed media

A. Vértes, K. Süvegh, M. Bokor, A. Domján, T. Marek, M. Klapper, C. U. Chisholm, M. El-Sharif, K. Tompa, Zs Nemes-Vetéssy, K. Burger

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Our work proves that positron annihilation spectroscopy is an excellent tool to follow the structural changes in chemical species. We present four examples to support the above statement. The sizes of defects in electrodeposited chromium layers were studied and estimated on the basis of positron lifetime spectra decomposed into two components. Vacancies, di- vacancies and vacancy-clusters could be identified in the electrodeposites. The changes of the size distribution of the free volume units in poly(methylmetacrylate) on the dependence of molecular weight and dispersity were described by the correlation between the lifetime of ortho-Ps and the free volume units in polymers. It was found that the free volume is affected by both the molecular weight and dispersity. The effect of dispersity was explained by the sample preparation technique, namely by the application of high pressure. The ortho-para conversion of ortho-Ps was used to follow the partial spin-crossover in [Fe(1-ethyl-1H-tetrazole)6](BF4)2. The spin- crossover temperature was identified to be 105 K. A conformal structural transformation was found in [Zn(1-propyl-1H-tetrazole)6](BF4)2 between 170 and 90 K by positronium lifetime measurement and the role of (BF4)2- anion, in this transformation, was proved by 19F NMR spectroscopy.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume239
Issue number1
DOIs
Publication statusPublished - 1999

Fingerprint

Free volume
Positrons
Vacancies
Molecular Weight
Electrons
Chromium
Molecular weight
Positron annihilation spectroscopy
Anions
Spectrum Analysis
Polymers
Magnetic Resonance Spectroscopy
Pressure
Nuclear magnetic resonance spectroscopy
Temperature
Negative ions
Defects
1H-tetrazole

ASJC Scopus subject areas

  • Analytical Chemistry
  • Inorganic Chemistry
  • Nuclear Energy and Engineering

Cite this

Frontiers of positron and positronium chemistry in condensed media. / Vértes, A.; Süvegh, K.; Bokor, M.; Domján, A.; Marek, T.; Klapper, M.; Chisholm, C. U.; El-Sharif, M.; Tompa, K.; Nemes-Vetéssy, Zs; Burger, K.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 239, No. 1, 1999, p. 29-36.

Research output: Contribution to journalArticle

Vértes, A. ; Süvegh, K. ; Bokor, M. ; Domján, A. ; Marek, T. ; Klapper, M. ; Chisholm, C. U. ; El-Sharif, M. ; Tompa, K. ; Nemes-Vetéssy, Zs ; Burger, K. / Frontiers of positron and positronium chemistry in condensed media. In: Journal of Radioanalytical and Nuclear Chemistry. 1999 ; Vol. 239, No. 1. pp. 29-36.
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