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Updated: Aug 5, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Spectroscopy of the conformational disorder in molecular films: tetracosane and squalane on Pt(111)
1Department of Physics and Astronomy, University of Columbia-Missouri, Columbia, Missouri 65201, USA. Dirk.Fuhrmann@infineon.com
Abstract:
The spectroscopic investigation of the molecular vibrations of adsorbed branched and unbranched alkane molecules using helium atom scattering (HAS) provides evidence for the thermal formation of gauche defects in tetracosane (C24H50) monolayers above 200 K. HAS results for the vibration of tetracosane molecules perpendicular to the Pt(111) surface reveal a strong frequency decrease and peak broadening above the transition temperature which can be related to a reduction of the force holding the molecules to the surface. This reduction of the force is interpreted as being due to the thermal formation of gauche defects within the tetracosane molecules.
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