Momentum-dependent excitations in highly ordered films of para-hexaphenyl

被引：29

作者：

Zojer, E ^{[1
]}

Knupfer, M ^{[1
]}

Resel, R ^{[1
]}

Meghdadi, F ^{[1
]}

Leising, G ^{[1
]}

Fink, J ^{[1
]}

机构：

[1] INST FESTKORPER & WERKSTOFFORSCH, D-01171 DRESDEN, GERMANY

来源：

PHYSICAL REVIEW B | 1997年 / 56卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.56.10138

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Highly textured para-hexaphenyl films have been investigated using electron energy-loss spectroscopy In transmission. The alignment of the crystallites in the free standing para-hexaphenyl films is determined by electron diffraction. Energy-loss functions for momentum transfers parallel and perpendicular to the molecular axis have been recorded. It is shown directly that a bandlike model-the so-called quasi-band-structure-is an appropriate tool to describe the momentum-dependent electronic excitations in such finite size systems, even if the molecules under consideration consist of only six repeat units as in hexaphenyl. [S0163-1829(97)06340-6].

引用

页码：10138 / 10144

页数：7

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