P. Lu, J. Polanyi, D. Rogers
Jun 14, 2000
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0
Influential Citations
32
Citations
Journal
Journal of Chemical Physics
Abstract
We report a comparative study of the photoinduced localized atomic reaction, LAR, of 1,2- and 1,4-dichlorobenzene (1,2- and 1,4-diClPh) on Si(111) 7×7, studied by scanning tunneling microscopy (STM). We observe different chlorine nearest-neighbor separations for the Cl–Si photoformed chemical “imprints” for the two adsorbates; the most probable separation of neighboring Cl’s in the case of 1,2-dichlorobenzene being 8±3 A, whereas that for 1,4-dichlorobenzene is 14±3 A. These differing separations can be understood if the two C–Cl bonds in the respective adsorbates extend roughly linearly to chlorinate a nearby Si dangling-bond; for 1,2 diClPh the two C–Cl bonds are at 60° to one another leading to the chlorination of closely neighboring Si, whereas for 1,4 diClPh the two C–Cl bonds are at ∼180° leading to chlorination of sites twice as far apart, located to either side of the 1,4 diClPh adsorbate.