Mixing of Frenkel and charge transfer excitons in quasi-one-dimensional copper phthalocyanine molecular crystals

被引：40

作者：

Knupfer, M ^{[1
]}

Schwieger, T ^{[1
]}

Peisert, H ^{[1
]}

Fink, J ^{[1
]}

机构：

[1] Leibniz Inst Festkorper & Werkstoffforsch Dresden, D-01171 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.69.165210

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present an electron energy-loss study of the nature of the low-lying singlet excitations in quasi-one-dimensional copper phthalocyanine molecular crystals. The observed variation of the spectral weight at different excitation energies strongly indicates the presence of two types of excitations near the excitation onset. These are associated with mixed intramolecular Frenkel and intermolecular charge transfer excitons. In particular, the lowest excitation component reveals a significant nondipolar character which can only be rationalized taking into account the admixture of charge transfer excitations.

引用

页码：165210 / 1

页数：5

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