Four photon low-frequency Raman spectroscopy of single wall carbon nanotubes

Abstract

Here we present the data of study of carbon nanotubes at ultra low (less than 0.1 μg/ml) concentration in aqueous surfactant suspension by four photon coherent Raman spectroscopy technique. The spectra have been recorded separately in the two spectral ranges from 100 to 250 cm-1 (3 – 7.5 THz) and ± 10 cm-1 (± 300 GHz). The two nanotube radial breathing modes (RBM) at 235 and 165 cm-1 have been observed. Besides we have detected the increasing of the rotational spectrum amplitude of H2O molecule arising on the water-nanotube interface. In fact, the amplitude increasing is observed mainly for ortho- spin-isomers of H2O.

Detection of the OH band fine structure in liquid water by means of new treatment procedure based on the statistics of the fractional moments

“…Undoubtedly, this experimental fact serves as additional evidence confirming a possibility of the oscillations of the OH band centre in liquid water that was observed earlier in [12]. Recently [13], the ortho-and para-H 2 O spin-isomer was observed in liquid water. Therefore one can suggest that the 3210 and 3450 cm −1 spectral bands can be attributed with para and ortho spin-isomer molecule ensembles.…”

Theory of coherent anti‐Stokes Raman scattering for mesoscopic particle with complex molecules: angular‐dependent spectrum

“…This figure is available in colour online at www.interscience.wiley.com/journal/jrs. in using CARS to study nano-materials like carbon nanotubes, [61] metalic nanoparticles and colloidal quantum dots. [62] Substantial enhancement of CARS signal in hollowed photonic-crystal fiber [63,64] leads to possibilities of studying microparticles in confined environments.…”