Positron annihilation lifetime measurement in supercritical fluid of N 2O

Kazushi Funakoshi, Yasushi Kino, Tsutomu Sekine, Hiroshi Kudo, Yasuo Ito, Takenori Suzuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We measured positron annihilation lifetime (PAL) spectra in N2O in the range from 3 nm-3 to 13 nm-3, focusing on density dependence of PAL in the medium including the supercritical fluid phase (critical temperature Tc = 309.6 K, critical pressure Pc = 7.24 MPa, critical density ρc = 6.18 nm-3). The PAL spectra were resolved into four components using the PATFIT code. We found the formation of two types of o-Ps. Namely, in addition to the longest lifetime component attributed to the o-Ps formation through the process explained by the Ore model, the third lifetime component (the second longest) was found in the density larger than 4.5 nm-3, while the former was observed continuously from the gas phase to the liquid phase.

Original languageEnglish
Title of host publicationPositron Annihilation
Subtitle of host publicationProceedings of the 13th International Conference on Positron Annihilation, ICPA-13
EditorsToshio Hyodo, Haruo Saito, Yoshinori Kobayashi, Yasuyuki Nagashima
PublisherTrans Tech Publications Ltd
Pages295-297
Number of pages3
ISBN (Print)9780878499366
Publication statusPublished - 2004 Jan 1
EventPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 - Kyoto, Japan
Duration: 2003 Sep 72003 Sep 12

Publication series

NameMaterials Science Forum
Volume445-446
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

OtherPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
CountryJapan
CityKyoto
Period03/9/703/9/12

Keywords

  • Nitrous Oxide
  • Ore Model
  • Positron Annihilation Lifetime
  • Positronium
  • Spur Model
  • Supercritical Fluid

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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