Raman and infrared studies of single-crystal C<sub>60</sub> and derivatives
P Bowmar; M Kurmoo; M A Green; F L Pratt; W Hayes; P Day; K Kikuchi; P Bowmar; Dept. of Phys., Oxford Univ., UK; M Kurmoo; Dept. of Phys., Oxford Univ., UK; M A Green; Dept. of Phys., Oxford Univ., UK; F L Pratt; Dept. of Phys., Oxford Univ., UK; W Hayes; Dept. of Phys., Oxford Univ., UK; P Day; Dept. of Phys., Oxford Univ., UK; K Kikuchi; Dept. of Phys., Oxford Univ., UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1993-04-26
Аннотация:
The authors describe results of Raman and infrared studies of single crystals of pure C<sub>60</sub>, CS<sub>2</sub> solvated C<sub>60</sub> (C<sub>60</sub>.1.5CS<sub>2</sub>) and of (BEDT-TTF)<sub>2</sub>C<sub>60</sub> (BEDT-TTF is bisethylenedithio tetrathiafulvalene of ET). They have observed phonon shifts in the crystal surfaces using Raman scattering which they assign to diffusion of molecular oxygen into the crystals; the results indicate that the presence of molecular oxygen hinders rotation of C<sub>60</sub> molecules in the crystals. The four T<sub>1u</sub> vibrational modes in the infrared spectrum of pure C<sub>60</sub> show fine structure which they attribute to Fermi resonances. They show that C<sub>60</sub> vibrations in C<sub>60</sub>.1.5CS<sub>2</sub> crystals are less anharmonic than in pure C<sub>60</sub> crystals.
467.3Кб