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|Title:||Multiple configurations of N-methylpyrrole binding on Si(111)-7X7|
|Source:||Tao, F.,Yuan, Z.L.,Chen, X.F.,Qiao, M.H.,Wang, Z.H.,Dai, Y.J.,Huang, H.G.,Cao, Y.,Xu, G.Q. (2003-06). Multiple configurations of N-methylpyrrole binding on Si(111)-7X7. Physical Review B - Condensed Matter and Materials Physics 67 (24) : 2454061-2454068. ScholarBank@NUS Repository.|
|Abstract:||The adsorption configurations of N-methylpyrrole on Si(111)-7x7 were investigated using high-resolution electron energy-loss spectroscopy, x-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and density function theory calculations. Compared to physisorbed N-methylpyrrole, chemisorbed molecules present a different vibrational feature at 2886 cm-1 attributable to v[(Si)Csp3-H] in addition to the vibrational features of (sp2)Cα-H (3106 cm-1), (sp2)Cβ-H (3050 cm-1), and C-H of CH3 (2944 cm-1) stretching modes, demonstrating the direct interaction between C=C bonds and Si(111)-7x7. The major change of N 1s XPS spectrum of N-methylpyrrole upon chemisorption strongly suggests the coexistence of two chemisorption states, further confirmed in the strong dependence of STM image features on the sample bias together with statistical analysis. The concurrent occurrence of [4+2] and [2+2] cycloadditions is proposed to account for these two adsorption configurations of N-methylpyrrole on Si(111)-7x7.|
|Source Title:||Physical Review B - Condensed Matter and Materials Physics|
|Appears in Collections:||Staff Publications|
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