Development of a sample chamber with humidity control for an atmospheric positron probe microanalyzer

16th International Conference on Positron Annihilation

Zhou, W.^1 ; Oshima, N.^1 ; Chen, Z.^2 ; Ito, K.^2 ; O'Rourke, B.E.^1 ; Kuroda, R.^1 ; Suzuki, R.^1 ; Yanagishita, H.^3 ; Tsutsui, T.^4 ; Uedono, A.^4 ; Hayashizaki, N.^5

Research Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan^1

Metrology Institute of Japan (MIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan^2

Research Institute for Innovation in Sustainable Chemistry (ISC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan^3

Division of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan^4

Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan^5

关键词: Atmospheric conditions;    Differential pressures;    Microanalyzers;    ortho-Positronium lifetime;    Positron lifetime measurements;    Silicon nitride thin films;    Slow positron;    Vacuum windows;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012090/pdf
DOI  :  10.1088/1742-6596/443/1/012090

来源: IOP

【 摘 要 】

In order to perform positron lifetime measurements on thin films under atmospheric conditions, a slow positron microbeam was extracted into air using silicon nitride thin films (30 nm and 200 nm) as a vacuum window. Even the thinner window (30 nm) was found to reliably withstand a differential pressure of 1 atm under various stress tests. By placing the sample in an enclosed chamber through which gas with a fixed, controllable relative humidity (RH) was continuously passed, the RH dependence of the ortho-positronium lifetime for bulk fused silica was examined.