Browsing by Author "LO, KL"

Now showing 1 - 2 of 2

RAMAN-SCATTERING OF THIN-FILM C-60/C-70 FULLERENES
(1993-10-01)
LO, KL
;
LEE, MC
;
交大名義發表
;
電子物理學系
;
National Chiao Tung University
High quality thin film fullerenes of C60, C70, and 50% mixture C60/70 were studied by Raman scattering. We observed not only ten complete (2A(g) + 8H(g)) modes in C60, which are assigned in accordance with the point group of a truncated icosahedron, but also drastically more (38) lines in C70, that is owing to the reduced symmetry. By measuring the 50% mixture sample, we were able to distinguish the features of C60 from that of C70. Most of the C60 modes appear at higher frequencies with respect to the corresponding C70 Modes, that is consistent with the cluster-mass difference. We also noticed the lower scattering efficiency Of C60 than that of C70, except the pinch A(g) mode at 1468 cm-1.
TEMPERATURE-DEPENDENT RAMAN-SPECTRA OF THIN-FILM C60/C70 FULLERENES AND ITS IMPLICATION IN SUPERCONDUCTOR
(1993-12-01)
LO, KL
;
LEE, MC
;
交大名義發表
;
電子物理學系
;
National Chiao Tung University
Thin filMS Of C60, and C70 fullerenes were studied by Raman scattering, from 295 to 10 K. As many as 48(42) peaks at 10(80) K, instead of 2Ag+8Hg modes in C60, and also up to 65 lines in C70 at 80 K are observed. Room temperature shoulders and mode-splitting are confirmed. They are due to new phases with the reduced symmetry at low temperatures and freezing of buckyball rotation. Besides, laser heating revealed new structures that may affect superconducting property.