Evidence for pore surface dependent positronium thermalization in mesoporous silica/hybrid silica films

Chunqing He, Toshiyuki Ohdaira, Nagayasu Oshima, Makoto Muramatsu, Atsushi Kinomura, Ryoichi Suzuki, Toshitaka Oka, Yoshinori Kobayashi

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

In this paper, we report the thermalization process of positronium (Ps) in various mesoporous silica/hybrid silica films with pore surfaces decorated by different groups, such as -OH, -H, and - C H3, studied by Ps time-of-flight measurement. Thermalization of Ps in pores with -OH and -H was found to be more efficient than in pores decorated with - C H3. This can be understood from the point of view that Ps thermalization rates upon collisions with these groups are different due to their different effective masses. Therefore, our observation shows that Ps slowing down in mesoporous silica/hybrid silica films is strongly dependent on the pore surface chemistry.

Original languageEnglish
Article number195404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number19
DOIs
Publication statusPublished - 2007 May 2
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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