Molecular Orientation of the Decyl Monolayer Chemically Bonded to Si(111) Determined by Angle-Dependent Transmission Infrared Spectroscopy

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概要

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• We applied angle-dependent transmission infrared spectroscopy for determination of the molecular orientation of a decyl monolayer chemically bonded to the Si(111) surface. The peak intensities for CH2 symmetric and antisymmetric stretching modes show similar variations as a function of incident angle. CH3 antisymmetric in-plane stretching mode shows a prominent increase in proportion to incident angle, but CH3 out-of-plane stretching mode decreases. By analyzing these experimental data, we estimated the orientation angles of dynamic dipole moments for these modes. We have evaluated the tilt angle of a carbon framework from the surface normal to be 27--30°, when the multireflection in a Si wafer is taken into account. However, without considering multireflection, the tilt angle becomes 15--20°. We conclude that the multireflection in the Si substrate should be considered in the analysis of angle dependent transmission IR spectra.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2011-11-25

著者

• Yoshinobu Jun

  The Institute For Solid State Physics The University Of Tokyo

• Furuhashi Masayuki

  The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan

• Furuhashi Masayuki

  The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

• Yoshinobu Jun

  The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan

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• Molecular Orientation of the Decyl Monolayer Chemically Bonded to Si(111) Determined by Angle-Dependent Transmission Infrared Spectroscopy

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