高エネルギーD^+イオンおよび重水素RFプラズマ照射したシリカかの捕捉重水素の熱脱離挙動 : FTIRとTPDMSの同時測定

概要

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When silica is irradiated by 80 keV D+ ions or RF plasma of D2 gas, deuterium is trapped in the silica forming≡Si-OD bonds. This phenomenon has been detected by infrared Fourier transform spectrometer (TFIR). The deuterium, trapped as OD bonds, is desorbed from the silica upon heating. The thermal desorption mechanisms of the trapped deuterium were studied here with FTIR and thermal programmed desorption mass spectrumeter (TPDMS). The thermal desorption rate of the trapped deuterium, that is the decrease in the rate of OD bonds upon heating, was measured by FTIR. The desorption products, such as HD, D2, HDO, and D2O, were measured by TPDMS. HD and D2 were produced at a temperature range of 550-700℃, while HDO and D2O were produced above 750℃. The thermal desorption spectra of both hydrogen (HD and D2) and water (HDO and D2O) corresponded to the thermal decrease spectra of the OD bonds. Thus it was concluded that the desorption products of both hydrogen and water are produced by the thermal decomposition of the OD bonds.
富山大学の論文