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.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry