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- W2404865282 abstract "Adsorbed states of ${mathrm{NH}}_{3}$ and ${mathrm{C}}_{6}$${mathrm{H}}_{6}$ on a Si(111)(ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface have been studied by the use of thermal desorption and high-resolution electron-energy-loss spectroscopy. At 90 K, a bulklike ${mathrm{NH}}_{3}$ multilayer, ${mathrm{NH}}_{3}$ hydrogen bonded to a chemisorbed one, and molecularly chemisorbed ${mathrm{NH}}_{3}$ exist on the (ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface. These desorb at ensuremath{sim}115, 140, and 170 K, respectively. Chemisorbed ${mathrm{NH}}_{3}$ has a very low NH stretching energy of ensuremath{sim}370 meV, and its N-H bonds are significantly weakened. A 2.0-eV loss, which corresponds to the electronic transition from an occupied backbond state to an empty dangling-bond state of the Si adatom on the (ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface, is removed upon ${mathrm{NH}}_{3}$ adsorption. It is proposed that chemisorbed ${mathrm{NH}}_{3}$ is coordinated to the Si adatom on the surface. ${mathrm{C}}_{6}$${mathrm{H}}_{6}$ does not chemisorb on the (ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface even at 90 K, but only physisorbs at 160 K. The adsorbed states of ${mathrm{NH}}_{3}$ and ${mathrm{C}}_{6}$${mathrm{H}}_{6}$ on the (ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface are quite different from those on clean Si surfaces, and the reactivity criterion of the surface is discussed. It is also found that the (ensuremath{surd}3 ifmmodetimeselsetexttimesfi{} ensuremath{surd}3 )R30ifmmode^circelsetextdegreefi{}-B surface has few defects when a large number of B atoms (ensuremath{sim}7ifmmodetimeselsetexttimesfi{}${10}^{19}$ ${mathrm{cm}}^{mathrm{ensuremath{-}}3}$) exists in the subsurface, which was evaluated by analyzing the surface-plasmon loss." @default.
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- W2404865282 title "Adsorbed states ofNH3andC6H6on the Si(111)(√3 × √3 )R30°-B surface: Thermal-desorption and electron-energy-loss-spectroscopy studies" @default.
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- W2404865282 doi "https://doi.org/10.1103/physrevb.50.17440" @default.
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