Spin polarized metastable He*(2(3)S, 1s2s) stimulated desorption of H+ ions

The yield of H+ in the metastable He*(2(3)S, 1s2s) stimulated desorption (M SD) on an H2O/Na/Fe surface has been found to depend on the spin of the inc ident He*. By combination with the spin-resolved analysis for the surface e lectronic structure, it is indicated that the neutralization of the hole in the OH 3 sigma molecular orbital, which is created by the incident He*, by Na 3s electrons plays a crucial role in the spin polarization of the H+ MS D intensity. The dependence of the spin polarization of H+ MSD on the kinet ic energy of the desorbed H+ has been observed, and it is discussed based o n the Menzel-Gomer-Readhead model.