Valence and Conduction Band States of PCBM as Probed by Photoelectron Spectroscopy at Resonant Excitation

被引：27

作者：

Richter, Matthias H. ^{[1
]}

Friedrich, Daniel ^{[1
]}

Schmeißer, Dieter ^{[1
]}

机构：

[1] Department of Applied Physics and Sensors, Brandenburg University of Technology, 03046 Cottbus

来源：

BioNanoScience | 2012年 / 2卷 / 01期

关键词：

NEXAFS; PCBM; Resonant photoelectron spectroscopy; Three-hole auger; UPS; XPS;

D O I：

10.1007/s12668-011-0034-1

中图分类号：

学科分类号：

摘要：

We have studied (6,6)-phenyl C 61 butyric acid methyl ester by near-edge X-ray absorption fine structure and resonant synchrotron radiation X-ray photoelectron spectroscopy. We determine the binding/hybridization character of the participating valence and conduction band states involving π * or σ * empty conduction band states. The analysis of the resonant Auger processes delivers a powerful tool to distinguish σ * and π * states in organic sp 2 hybridized systems. For the σ * states, we find the conventional KLL Auger process creating a C2p 4 final state. However, for the π * features right at the resonance, we identify a novel Auger decay mechanism. We attribute this process to the decay of an excitonic intermediate state with a long lifetime which causes a three-hole (C2p 3) final state. © 2012 Springer Science+Business Media, LLC.

引用

页码：59 / 65

页数：6

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