Core-Hole Screening, Electronic Structure, and Paramagnetic Character in Thin Films of Organic Radicals Deposited on SiO2/Si(111)
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- 作者：Reza Kakavandi ; Sabine-Antonia Savu ; Lorenzo Sorace ; Donella Rovai ; Matteo Mannini ; Maria Benedetta Casu
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：April 17, 2014
- 年：2014
- 卷：118
- 期：15
- 页码：8044-8049
- 全文大小：302K
- 年卷期：v.118,no.15(April 17, 2014)
- ISSN：1932-7455
文摘
We investigate thin films of a pyrene derivative of the nitronyl nitroxide radical deposited on SiO2/Si(111). By using X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy, we study the electronic structure of the system. From photon energy-dependent analysis, we suggest the occurrence of a shake-up transition consisting of a dipole excitation of a core electron into a valence orbital and a monopole ionization of a valence electron. The persistence of the paramagnetic character is explored by electron spin resonance spectroscopy.