Spin Polarized Metastable He *\(23S, 1s2s\) Stimulated Desorption of H+ Ions

The yield of H ⁺ in the metastable He ^*\(2³S, 1s2s\) stimulated desorption (MSD) on an H ₂O/Na/Fe surface has been found to depend on the spin of the incident He ^*. By combination with the spin-resolved analysis for the surface electronic structure, it is indicated that the neutralization of the hole in the OH 3σ molecular orbital, which is created by the incident He ^*, by Na 3s electrons plays a crucial role in the spin polarization of the H ⁺ MSD intensity. The dependence of the spin polarization of H ⁺ MSD on the kinetic energy of the desorbed H ⁺ has been observed, and it is discussed based on the Menzel-Gomer-Readhead model.