Site selective atomic chlorine adsorption on the Si(111)7×7 surface

Spectroscopic scanning tunnel microscopy of Cl–Si(111)7×7: Determination of Cl–Si σ* resonance line shape

“…The clean silicon sample was exposed by passing trichloroethylene vapor into the main chamber from the gas line via a precision variable leak valve. 13 It has been shown that at exposure of Si͑111͒7 ϫ 7 to trichloroethylene at room temperature results in thermal dissociation of the molecule into an atomic chlorine product and a chlorovinyl group. 13 At very low dosage levels, both products chemisorb and are left separated with an average distance of 30 Å.…”

“…13 It has been shown that at exposure of Si͑111͒7 ϫ 7 to trichloroethylene at room temperature results in thermal dissociation of the molecule into an atomic chlorine product and a chlorovinyl group. 13 At very low dosage levels, both products chemisorb and are left separated with an average distance of 30 Å. At this level of separation the chlorine atoms can considered to be isolated, i.e., with very little effect from other adsorbates.…”

“…[1][2][3][4][5][6] Furthermore it has been established that scanning tunnel microscopy ͑STM͒ can be used to induce diffusion and desorption of chemisorbed chlorine atoms. [7][8][9][10][11][12][13] This example of tip-induced diffusion is unique to our knowledge in that the effect can be achieved when the tip is not positioned directly over the adsorbate. In fact diffusion can be induced even when the tip is up to 20-30 nm away.…”

“…1 However, for higher bias values ͑Ͼ2.0 V͒ there is a transition to a situation where the Cl adsorbed sites appear brighter ͑higher͒ than unreacted adatoms. 1,13 The explanation for this transition has been attributed to near-resonant tunneling through the tail of a higher-lying * Si-Cl antibonding state. 1 The existence of such a state is supported by the self-consistent pseudopotential band structure calculations of Schluter and Cohen.…”

Thermodynamically induced particle transport: Order-by-induction and entropic trapping at the nano-scale

“…Also, large molecules can now be rotated and translated by small amounts on a surface, TBPP for example [23]. Atomic manipulation can even be used as a characterization tool for identifying products of surface dissociation studies, for example chlorine atoms from trichloroethylene [24]. Also noteworthy are recent results showing non-local STM induced manipulations (See [25] and references within) where it appears that the spread of injected carriers over ≈ 100 Å after tunneling plays an important role.…”