Abstract
We report a novel two-dimensional gas-solid phase transition of pentacene molecules on the Cu(110)-(2 × 1)O surface where the 2D condensation is accompanied by a reversible azimuthal rotation of the pentacene molecules. The change of the optical anisotropy associated with this reorientation allows us to explore the 2D condensation as a function of coverage and temperature by reflectance difference spectroscopy. As a result, the 2D heat of condensation of pentacene on Cu(110)-(2 × 1)O is determined to be 84 meV, which is more than one order of magnitude smaller than the respective value for 3D crystallization.
Highlights
Adsorption of large -conjugated molecules on inorganic solid surfaces is a topic of great interest in both fundamental research and technological applications [1,2,3]
We report a novel two-dimensional gas-solid phase transition of pentacene molecules on the Cuð110Þ-ð2 Â 1ÞO surface where the 2D condensation is accompanied by a reversible azimuthal rotation of the pentacene molecules
The change of the optical anisotropy associated with this reorientation allows us to explore the 2D condensation as a function of coverage and temperature by reflectance difference spectroscopy
Summary
Adsorption of large -conjugated molecules on inorganic solid surfaces is a topic of great interest in both fundamental research and technological applications [1,2,3]. We report a novel two-dimensional gas-solid phase transition of pentacene molecules on the Cuð110Þ-ð2 Â 1ÞO surface where the 2D condensation is accompanied by a reversible azimuthal rotation of the pentacene molecules.
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