ABSORPTION-SPECTRA OF CRYSTALLINE FULLERITE 60 AT PRESSURES UP TO 19-GPA

被引:30
作者
MELETOV, KP
DOLGANOV, VK
ZHARIKOV, OV
KREMENSKAYA, IN
OSSIPYAN, YA
机构
来源
JOURNAL DE PHYSIQUE I | 1992年 / 2卷 / 11期
关键词
D O I
10.1051/jp1:1992270
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The absorption spectra of the thin fullerite crystals, C60, have been measured in the energy range 1.1-3.1 eV at room temperature and pressures up to 19 GPa. The mean rate of the spectral pressure shift dE/dP has been estimated for strong- and weak-absorption regions. It has been found that in the strong-absorption region its value at normal pressure is - 0.15 eV/GPa, and then its absolute value decreases to 0.019 eV/GPa at 12 GPa. The weaker-absorption region located, under normal pressure, at the red edge shifts much more slowly (dE/dP = - 0.05 eV/GPa) and coalesces with the strong-absorption region at pressures exceeding 2.0 GPa. The T = 4.2 K measurements indicate the presence of a fine structure in the weak-absorption region of fullerite 60, that transforms to a step at room temperature. The dependence of the weak-absorption edge shift on the intermolecular distances has been determined and shown to be governed by the Van der Waals forces of the intermolecular interaction.
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页码:2097 / 2105
页数:9
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