Positronium bubble in room temperature ionic liquids

Hirade, Tetsuya

The Ps bubble oscillations in N,N,N-trimethyl-N-propylammonium bis(trifluoro-methanesulfonyl)imide (TMPA-TFSI), N-Methyl-N-propylpiperidinium bis(trifluoromethane-sulfonyl) imide (PP13-TFSI) and 1-Ethyl-3-methylimidazolium thiocyanate (EMIM-SCN) were successfully observed. It is almost impossible to see this kind of phenomenon in usual molecular liquids. Even though the Ps bubble size is smaller for EMIM-SCN, the oscillation frequency of the Ps bubble at 10 $^{circ}$ C above the melting temperatures were quite similar for the other RTILs. Hence, the Ps bubble oscillation is, probably, caused by the repulsive force initiated by the ionic structures in RTILs that can remain at 10-15 $^{circ}$ C above the melting temperatures.

Language	:	Japanese
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Meeting title	:	平成29年度京都大学原子炉実験所専門研究会「陽電子科学とその理工学への応用」
Held date	:	2017/12
Location (city)	:	熊取
Location (country)	:	日本
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Keywords	:	陽電子消滅; 室温イオン液体; ポジトロニウム
Research Facility	:	第4研究棟
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Registration No. : BB20171562
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