Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam

H. Stoll, P. Castellaz, S. Koch, J. Major, H. Schneider, A. Seeger, A. Siegle

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Speed and performance of positron age-momentum-correlation (AMOC) measurements have recently been improved significantly by taking advantage of the β+γΔEγ-coincidence technique at the Stuttgart MeV positron beam and the development of a two-dimensional data-analysis procedure that makes full use of the experimental information. AMOC gives a fairly direct access to transitions and reactions between different positron states, such as trapping of positrons at defects, chemical reactions of positronium (Ps) {positronium chemistry}, spin conversion of Ps, and reactions of positrons with ions (e.g., halide ions) in solutions. In addition, quantitative information may be obtained on the Ps thermalization times in solids and liquids and on the kinetic energies at which Ps is formed. Ps thermalization times between 20 ps and 43 ps have been found in materials with optical phonon branches. In condensed Ar and Kr, in which optical phonons are absent, longer Ps thermalization times are observed, viz. 125 ps to 250 ps in Ar, and 400 ps to 500 ps in Kr. Evidence for "positronium bubble states" has been found not only in the rare-gas liquids but also in solid Ne.

Original languageEnglish
Pages (from-to)92-96
Number of pages5
JournalMaterials Science Forum
Volume255-257
Publication statusPublished - 1997

Fingerprint

positronium
Positrons
positrons
Momentum
momentum
Experiments
Ions
Noble Gases
Liquids
Phonons
Electron transitions
Inert gases
Kinetic energy
Chemical reactions
liquids
Defects
halides
rare gases
chemical reactions
ions

Keywords

  • Age-Momentum Correlation
  • AMOC
  • Condensed Rare Gases
  • Halide Ions
  • HTMPO
  • MeV Positron Beam
  • Positronium Bubbles
  • Positronium Chemistry
  • Positronium Thermalization

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Stoll, H., Castellaz, P., Koch, S., Major, J., Schneider, H., Seeger, A., & Siegle, A. (1997). Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam. Materials Science Forum, 255-257, 92-96.

Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam. / Stoll, H.; Castellaz, P.; Koch, S.; Major, J.; Schneider, H.; Seeger, A.; Siegle, A.

In: Materials Science Forum, Vol. 255-257, 1997, p. 92-96.

Research output: Contribution to journalArticle

Stoll, H, Castellaz, P, Koch, S, Major, J, Schneider, H, Seeger, A & Siegle, A 1997, 'Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam', Materials Science Forum, vol. 255-257, pp. 92-96.
Stoll H, Castellaz P, Koch S, Major J, Schneider H, Seeger A et al. Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam. Materials Science Forum. 1997;255-257:92-96.
Stoll, H. ; Castellaz, P. ; Koch, S. ; Major, J. ; Schneider, H. ; Seeger, A. ; Siegle, A. / Age-momentum-correlation (AMOC) experiments by means of an MeV positron beam. In: Materials Science Forum. 1997 ; Vol. 255-257. pp. 92-96.
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