Highly sensitive hydrogen detection by medium energy Ne+ impact |
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Authors: | K. Mitsuhara T. Kushida H. Okumura H. Matsumoto A. Visikovskiy Y. Kido |
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Affiliation: | Department of Physics, Ritsumeikan University, Kusatsu, Shiga-ken 525-8577, Japan |
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Abstract: | Hydrogen atoms on solid surfaces were measured directly by elastic recoil detection analysis (ERDA) using medium energy (100–150 keV) Ne+ ions with an excellent sensitivity of (~ 1 × 1012 H/cm2) without any absorber foils and time-of-flight techniques. An electrostatic toroidal analyzer acquired H+ ions with energy around 11 keV recoiled from Si(111)-1 × 1-H surfaces. The H+ fraction strongly depends upon emerging angle and takes a value more than 50% at the angle below 70° and a saturated value of 17% at the angle above 80° with respect to surface normal. We detected H atoms on the reduced TiO2(110) exposed to water molecules at room temperature (2 L) and estimated the absolute amount of H to be ~ 2.0 × 1014 H/cm2 corresponding to ~ 38% (~ 0.38 ML) of the bridging oxygen atoms. |
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