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Internal inelastic scattering satellite probed by molecular-frame photoelectron angular distributions from CO2
X-J Liu1, H Fukuzawa, T Teranishi
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
Physical Review Letters
|September 4, 2008
Summary
Molecular-frame photoelectron angular distribution (MFPAD) measurements reveal internal inelastic scattering excites CO2
Area of Science:
- Quantum Chemistry
- Molecular Spectroscopy
- Photoionization Physics
Background:
- The C 1s photoline of CO2 exhibits accompanying satellite peaks.
- Understanding the excitation mechanisms of these satellites is crucial for interpreting photoionization spectra.
Purpose of the Study:
- To investigate the excitation mechanism of the satellite accompanying the C 1s photoline of CO2.
- To analyze the molecular-frame photoelectron angular distribution (MFPAD) at the C 1s(2sigmag)-->4sigmau* shape resonance.
Main Methods:
- Electron-ion multicoincidence momentum spectroscopy was employed.
- Measurements were performed at the C 1s(2sigmag)-->4sigmau* shape resonance of CO2.
Main Results:
- The measured MFPAD indicates excitation via internal inelastic scattering.
- This process involves a C 1s photoelectron colliding with a lone-pair electron.
Conclusions:
- Internal inelastic scattering explains the observed satellite excitation in CO2.
- The process results in a satellite photoelectron with sigmag symmetry, losing original emission information.
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