Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5426819 | Surface Science | 2006 | 6 Pages |
Initial hydrogen adsorption on the Si(1Â 1Â 1) 7Â ÃÂ 7 surface was studied by scanning tunneling microscopy (STM) in an ultrahigh vacuum. Room temperature adsorbed hydrogen on the adatom in the 7Â ÃÂ 7 reconstruction led to depression of adatoms in the STM images. The hydrogen uptake curve at the adatom site as a function of hydrogen exposure time was well represented by Langmuir adsorption. No preferential adsorption was seen among four inequivalent adatoms in the 7Â ÃÂ 7 reconstruction. Adsorption of the adjacent center and corner adatoms respectively showed â¼10% higher adsorption. Even though the number of reacted adatoms in the half unit of the 7Â ÃÂ 7 reconstruction was statistically random, the number of reacted adatoms in the nearest neighbor half unit was enhanced as the number of reacted sites increased in the half unit.