Internal Inelastic Scattering Satellite Probed by Molecular-Frame Photoelectron Angular Distributions from CO2

X.-J. Liu (1) , H. Fukuzawa (1) , T. Teranishi (1) , A. de Fanis (1) , M. Takahashi (1) , H. Yoshida (2) , Amine Cassimi (3) , A. Czasch , L. Schmidt , R. Dorner , I. Koyano (4) , N. Saito (5) , K. Ueda (1)

1 Institute of Multidisciplinary Research for Advanced Materials
2 Department of Physical Sciences [Higashi-Hiroshima]
3 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
4 Department of Material Science
5 National Metrology Institute of Japan

The molecular-frame photoelectron angular distribution (MFPAD) of the satellite accompanying the C 1s photoline of the CO2 molecule has been measured at the C 1s(2σg)→ 4σ*u shape resonance, using electron-ion multicoincidence momentum spectroscopy. The observed MFPAD indicates that the conjugate satellite is excited by internal inelastic scattering. In this scenario, a photoelectron is ejected from the C 1s(2σg) orbital along the molecular axis and collides with an O lone-pair electron in the highest occupied molecular orbital 1πg. Then one of the colliding electrons is trapped to the lowest unoccupied molecular orbital 2π*u, while the other is emitted as a satellite photoelectron of σg symmetry, losing the information of the original photoelectron emission direction and parity.

Domains: Atomic Physics [physics.atom-ph]

X.-J. Liu, H. Fukuzawa, T. Teranishi, A. de Fanis, M. Takahashi, et al.. Internal Inelastic Scattering Satellite Probed by Molecular-Frame Photoelectron Angular Distributions from CO2. Physical Review Letters, 2008, 101, pp.023001. ⟨cea-00306462⟩