SYMMETRY FOR LATTICE MODES IN C-60 AND ALKALI-METAL-DOPED C-60

被引:112
作者
DRESSELHAUS, G
DRESSELHAUS, MS
EKLUND, PC
机构
[1] MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139
[2] MIT,DEPT PHYS,CAMBRIDGE,MA 02139
[3] UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506
来源
PHYSICAL REVIEW B | 1992年 / 45卷 / 12期
关键词
D O I
10.1103/PhysRevB.45.6923
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a group-theoretical analysis relevant to the interpretation of recent experimental observations of Raman-scattering spectroscopy in C60 and alkali-metal-doped C60. The group-theoretical analysis makes use of two space groups, both of which reduce the icosahedral point-group symmetry of the isolated C60 molecule to the cubic group T(h). The space group for the fcc arrangement of fullerene is T(h)6 and corresponds to the low-temperature solid phase of pristine C60. The bcc arrangement for solid M6C60, where M is an alkali metal, is consistent with the space group T(h)5 and is the symmetry considered for the fully doped alkali-metal material. The experimental Raman spectra show line splittings which are consistent with a symmetry lowering to T(h) symmetry for the fullerene molecule. However, the polarization selection rules observed experimentally indicate a further lowering of the symmetry, beyond cubic symmetry.
引用
收藏
页码:6923 / 6930
页数:8
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