Study of the Valence Wave Function of Thiophene with High Resolution Electron Momentum Spectroscopy and Advanced Dyson Orbital Theories
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- 作者：Y. R. Huang ; B. Hajgató ; C. G. Ning ; S. F. Zhang ; K. Liu ; Z. H. Luo ; J. K. Deng ; M. S. Deleuze
- 刊名：Journal of Physical Chemistry A
- 出版年：2008
- 出版时间：March 20, 2008
- 年：2008
- 卷：112
- 期：11
- 页码：2339 - 2354
- 全文大小：4102K
- 年卷期：v.112,no.11(March 20, 2008)
- ISSN：1520-5215
文摘
Results of an exhaustive experimental study of the valence electronic structure of thiophene using high resolutionelectron momentum spectroscopy at impact energies of 1200 and 2400 eV are presented. The measurementswere performed using an electron momentum spectrometer of the third generation at Tsinghua University,which enables energy, polar and azimuthal angular resolutions of the order of 
E = 0.8 eV, 
= ±0.53
and 
= ±0.84. These measurements were interpreted by comparison with Green's function calculationsof one-electron and shake-up ionization energies as well as of the related Dyson orbital electron momentumdistributions, using the so-called third-order algebraic diagrammatic construction scheme (ADC(3)). Comparisonof spherically averaged theoretical electron momentum distributions with experimental results very convincinglyconfirms the presence of two rather intense 
-2 *+1 shake-up lines at electron binding energies of 13.8 and15.5 eV, with pole strengths equal to 0.18 and 0.13, respectively. Analysis of the electron momentumdistributions associated with the two lowest 2A2 (3-1) and 2B1 (2-1) cationic states provides indirect evidencefor a symmetry lowering and nuclear dynamical effects due to vibronic coupling interactions between thesetwo states. ADC(3) Dyson orbital momentum distributions are systematically compared with distributionsderived from Kohn-Sham (B3LYP) orbitals, and found to provide most generally superior insights intoexperiment.
E = 0.8 eV, = ±0.53and = ±0.84. These measurements were interpreted by comparison with Green's function calculationsof one-electron and shake-up ionization energies as well as of the related Dyson orbital electron momentumdistributions, using the so-called third-order algebraic diagrammatic construction scheme (ADC(3)). Comparisonof spherically averaged theoretical electron momentum distributions with experimental results very convincinglyconfirms the presence of two rather intense -2 *+1 shake-up lines at electron binding energies of 13.8 and15.5 eV, with pole strengths equal to 0.18 and 0.13, respectively. Analysis of the electron momentumdistributions associated with the two lowest 2A2 (3-1) and 2B1 (2-1) cationic states provides indirect evidencefor a symmetry lowering and nuclear dynamical effects due to vibronic coupling interactions between thesetwo states. ADC(3) Dyson orbital momentum distributions are systematically compared with distributionsderived from Kohn-Sham (B3LYP) orbitals, and found to provide most generally superior insights intoexperiment.