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Pshenichnyuk SA, Vorob'ev AS, Asfandiarov NL, et al. Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy. J Chem Phys. 2010;132(24):244313doi: 10.1063/1.3456737.
Pshenichnyuk, S. A., Vorob'ev, A. S., Asfandiarov, N. L., & Modelli, A. (2010). Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy. The Journal of chemical physics, 132(24), 244313. https://doi.org/10.1063/1.3456737
Pshenichnyuk, Stanislav A, et al. "Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy." The Journal of chemical physics vol. 132,24 (2010): 244313. doi: https://doi.org/10.1063/1.3456737
Pshenichnyuk SA, Vorob'ev AS, Asfandiarov NL, Modelli A. Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy. J Chem Phys. 2010 Jun 28;132(24):244313. doi: 10.1063/1.3456737. PMID: 20590199.
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J Chem Phys. 2010 Jun 28;132(24):244313. doi: 10.1063/1.3456737.

Molecular anion formation in 9,10-anthraquinone: Dependence of the electron detachment rate on temperature and incident electron energy.

The Journal of chemical physics

Stanislav A Pshenichnyuk, Alexander S Vorob'ev, Nail L Asfandiarov, Alberto Modelli

Affiliations

  1. Institute of Physics of Molecules and Crystals, Ufa Research Center, Russian Academy of Sciences, October Avenue, 151, 450075 Ufa, Russia. [email protected]

PMID: 20590199 DOI: 10.1063/1.3456737

Abstract

Attachment of low-energy electrons to gas phase 9,10-anthraquinone (AQ) was observed with electron transmission (ET) spectroscopy, and interpreted with the support of quantum chemical calculations. The ET spectrum displays three shape resonances at 0.45, 0.7, and 2.2 eV, associated with temporary electron capture into empty pi( *) molecular orbitals of AQ, the first two anion states being stable. According to TD-B3LYP calculations, the first pi-pi( *) core-excited resonance lies at about 1.8 eV, although no experimental evidence for this anion state was found. The long-lived parent molecular anion [AQ](-) was observed by means of Electron Attachment Spectroscopy (EAS) using two different mass spectrometers and also by measuring the total anion current at the collision chamber walls. The molecular anion current shows maxima at zero energy, around 0.6 eV and at 1.8 eV. Association of these maxima with the corresponding resonant anion states is discussed. The experimentally measured electron detachment times from [AQ](-) as a function of the incident electron energy and the temperature of the target molecule show a pronounced change of slope around 1.5 eV, regardless of the temperature. This unexpected behavior can be qualitatively reproduced within the framework of a multiexponential approach which describes the electron detachment event in terms of a redistribution of the anion excess energy, regardless of the initial mechanism of temporary anion formation.

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