Shifen Hu

Graphical method for assigning Raman peaks of radial breathing modes of single-wall carbon nanotubes

In order to assign Raman scattering peaks of radial breathing modes (RBMs) of single-wall carbon nanotubes (SWNTs), we have already developed a graphical method. Two charts were constructed based on the data of diameters, RBM frequencies and electronic density of states (DOS) of SWNTs. Using them we have successfully assigned resonant scattering peaks of RBM in the Raman Spectra recorded by Rao et al. The assignments indicate that SWNT samples exhibit many different structures with no one species dominating.

Raman spectra of 3-methyl-4-nitropyridine-N-oxide single crystal

Abstract A Raman study of 3-methyl-4-nitropyridine-N-oxide single crystal (3M4NPO) has been performed at 78 K in the range 10–3500 cm−1. The symmetry analysis of the vibrational modes of 3M4NPO is given. The assignments are presented for internal and external modes. The results of the Raman spectra exhibit the spectroscopic proofs of hydrogen bonds in the crystal.

Vibrational spectroscopic study of (NH2CH2COOH)2CdCl2 crystal

Abstract The Raman and the infrared absorption spectra of diglycine cadmium chloride (NH 2 CH 2 COOH) 2 CdCl 2 crystal have been recorded. The observed vibrational bands are assigned to the internal vibrations of glycine molecules. The vibrational spectra show that the glycine molecule is in the form of the zwitterion in the crystal.

X-ray diffraction and raman scattering studies of HClO4-graphite intercalation compounds

Abstract The stage phenomenon of HClO 4 -graphite intercalation compounds (HClO 4 -GIC) prepared by the electrochemical reaction was studied by means of X-ray diffraction and Raman scattering. The stage characteristics of HClO 4 -GICs corresponding to various points on the potential curve were observed. The resonant enhanced Raman scattering from the graphitic intralayer mode has been found in stage 1 and stage 2 HClO 4 -GIC.

Raman scattering study of benzophenone under high pressure

Abstract Benzophenone (C 6 H 5 COC 6 H 5 , BPH) has been studied by high pressure Raman spectroscopy up to 100 kbar using a diamond-anvil cell at room temperature. The splittings of several non-degenerate internal modes at high pressure are interpreted as the dimerization of BPH molecules. The disappearance of all external and most internal lines found at pressures above 110 kbar is explained as a crystalline-to-amorphous phase transformation. A mechanism of pressure-induced amorphization driven by randomlyoriented dimers of BPH molecules is proposed. Upon release of pressure, the virgin crystalline state is recovered, but with substantial hysteresis.