We propose to use the damping signal of an oscillating cantilever in dynamic atomic force microscopy as a noninvasive tool to study the vibrational structure of the substrate. We present atomically resolved maps of damping in carbon nanotube peapods, capable of identifying the location and packing of enclosed Dy@C82 molecules as well as local excitations of vibrational modes inside nanotubes of different diameter. We elucidate the physical origin of damping in a microscopic model and provide quantitative interpretation of the observations by calculating the vibrational spectrum and damping of Dy@C82 inside nanotubes with different diameters using ab initio total energy and molecular dynamics calculations.
Adsorption-Driven Symmetry Lowering in Single Molecules Revealed by Ångstrom-scale Tip-Enhanced Raman Imaging
Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences（捷克科学院有机化学与生物化学研究所）；Institute of Physics, Czech Academy of Sciences（捷克科学院物理研究所）；Instituto de Ciencia de Materiales de Madrid（马德里材料科学研究所）；Departamento de Química, Universidad Autónoma de Madrid（马德里自治大学化学系）；Faculty of Mathematics and Physics, Charles University（查理大学数学与物理学院）；Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid（马德里自治大学化学高级研究院）
