NEAR-INFRARED RAMAN-SPECTROSCOPY OF SOLID C-60 - RAMAN ACTIVATION OF SILENT MODES BY C-13 AND SAMPLE DISORDER

被引：42

作者：

LOVE, SP

MCBRANCH, D

SALKOLA, MI

COPPA, NV

ROBINSON, JM

SWANSON, BI

BISHOP, AR

机构：

[1] LOS ALAMOS NATL LAB,DIV THEORET T-11,LOS ALAMOS,NM 87545

[2] LOS ALAMOS NATL LAB,DIV MAT NMT-6,LOS ALAMOS,NM 87545

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 225卷 / 1-3期

关键词：

D O I：

10.1016/0009-2614(94)00631-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-resolution Raman spectra excited from 1.45 to 1.75 eV are presented for solid C60 films and crystals prepared by four methods. Intersample comparison shows that imperfections introduced in sample preparation can lower symmetries sufficiently to activate silent modes, while oxygen has no observable effect. UnusuaI resonance and broadening effects observed near 1.6 eV indicate the existence of a weak electronic transition. Explicit calculations for C60 molecules having one or two C-13 atoms reproduce the observed spectra and show that isotopic symmetry lowering is manifested in lifting of H(g) degeneracies and activation of silent modes through mixing with nearby Raman-active modes.

引用

页码：170 / 180

页数：11

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