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Pseudo-two dimensional films/pseudo-one dimensional wire of metals and fullerene studied by positron annihilation spectroscopy.

Research Project

Project/Area Number 07650759
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionTokyo Gakugei University

Principal Investigator

MURAKAMI Hideoki  Tokyo Gakugei University, Faculty of Education, Professor, 教育学部, 教授 (30011000)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsPositron annihilation / Positronium / Porous materials / fullerene / 多孔性ガラス / 陽電子
Research Abstract

The purposes of this study is to clarify the physical and chemical properties of thin films deposited on the micro-pore surfaces and those of thin wires packed in the micro pores of porous materials. Results are :
1. The positronium yield and lifetime were measured on the potassium thin films deposited on the pore surfaces of a micro porous glass. The positronium intensity was decreased from 20% to 3%, and its lifetime was lengthened from 1.3ns to 6.0ns with the deposition of the film.
2. The formation rate and lifetime of positroniums after packing of potassium metal into pores were close to those before the packing. We conclude that the positroniums are formed in the glass and they are not ejected into the pores.
3. The measurements of positron lifetime and Doppler broadening were carried out on the nicro porous glass absorbing liquid benzene. The amount of benzene evaporation was obtained from the lifetime and line-shape parameter.
4. Brominated fullerene was synthesized. The Doppler spectra for the brominated fullerene showed that the positron annihilate preferentially in the interstitial sites among the fullerene molecules.
5. Alkali metals were doped into fullerene crystal. The change in positron lifetime made clear that some fraction of positrons annihilate in fullerene molecules while the others in interstitial sites among the molecules.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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