Spectroscopy of vibrational modes in metal nanoshells

Raman Spectroscopy Investigation of the Polar Vibrational Modes in CuB2O4

We report results of polarized Raman spectroscopy of piezoelectric copper metaborate CuB2O4 (space group I ̄42d, Z = 12) in the range from 80 to 1300 cm−1. Due to the dense population of the phonon spectra we carried out angular-dependent measurements by rotating the sample in different crystallographic planes thus performing gradual transitions from one polarization configuration to another. T...

Revealing subsurface vibrational modes by atom-resolved damping force spectroscopy.

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@C_{82} molecules as well as local excitations of vibrational modes inside nanotubes...

Chiral discrimination by vibrational spectroscopy utilizing local modes.

Chiral discrimination of homochiral and heterochiral H-bonded complexes is a challenge for both experimentalists and computational chemists. It is demonstrated that a two-pronged approach based on far-infrared vibrational spectroscopy and the calculation of local mode frequencies facilitates the chiral discrimination of H-bonded dimers. The local H-bond stretching frequencies identify the stron...

Vibrational Spectroscopy of Gas-Phase Metal-Carbide Clusters and Nanocrystals

Coherent acoustic vibration of metal nanoshells.

Using time-resolved pump-probe spectroscopy, we have performed the first investigation of the vibrational modes of gold nanoshells. The fundamental isotropic mode launched by a femtosecond pump pulse manifests itself in a pronounced time-domain modulation of the differential transmission probed at the frequency of nanoshell surface plasmon resonance. The modulation amplitude is significantly st...