Abstract
The adsorption of hydrogen on Ru(001) has been studied with angle-resolved photoemission using synchrotron radiation. Hydrogen adsorption at substrate temperatures below 250 K results in pronounced changes in the photoemission spectra compatible with a (1 × 1) overlayer of hydrogen adsorbed on threefold sites. Hydrogen induced extrinsic surface states are found at - 3.7 eV at ΓgG and -1.0 and -2.3 eV at K. The H 1s derived band, split-off from the metal d band, is located at -8.1 eV at Γ -5.9 eV at K, and -7.2 eV at M. A model is proposed to account for the drastic influence of hydrogen on final state peaks from clean Ru(001) along the surface normal. Room temperature adsorption results in spectra practically indistinguishable from those from the clean surface. This is attributed to different adsorption sites at low and high temperatures (the latter possibly being an underlayer site).
| Original language | English |
|---|---|
| Pages (from-to) | 382-391 |
| Number of pages | 10 |
| Journal | Surface Science |
| Volume | 152-153 |
| Issue number | PART 1 |
| DOIs | |
| State | Published - Apr 1985 |