首页|Temperature dependence of positron annihilation lifetime in near-surface and bulk of room-temperature ionic liquid observed by a slow positron beam
Temperature dependence of positron annihilation lifetime in near-surface and bulk of room-temperature ionic liquid observed by a slow positron beam
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NSTL
Elsevier
We obtained temperature dependence up to 150 ?C of the triplet positronium (ortho-Ps) lifetime in N,N,N-Trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide (TMPA-TFSI) using the vertical slow positron beamline installed at AIST. The ortho-Ps lifetimes at the near-surface and bulk regions of TMPA-TFSI were measured. The lifetime difference between the near-surface and bulk at 150 ?C, 130 ?C above the melting temperature, suggested that the molecular oriented structure at the surface remained. The ortho-Ps lifetimes at the near-surface and bulk became shorter as the temperature increased. On the contrary, the ortho-Ps lifetimes became longer as the temperature increased when other molecular liquids were employed except for water.
Positron annihilation lifetimeRoom temperature ionic liquidTemperature dependenceLiquid surfaceSTATES
NSTL
Elsevier
