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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Double photoionization into double core-hole states in Xe
Y Hikosaka1, P Lablanquie, F Penent
1UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan.
Physical Review Letters
|May 16, 2007
Summary
This study investigated double photoionization (DPI) in Xenon, revealing a favored cross-section for creating double core-hole states. This intense DPI is linked to the mixing of electronic states during photoionization.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Spectroscopy
Background:
- Double photoionization (DPI) is a complex atomic process where an atom absorbs a single photon and emits two electrons.
- Understanding core-hole states is crucial for characterizing atomic electronic structures and dynamics.
Purpose of the Study:
- To investigate double photoionization (DPI) in Xenon (Xe) leading to double core-hole states (Xe2+ 4d(-2)).
- To confirm the assignments of these Xe2+ 4d(-2) states using advanced coincidence spectroscopy techniques.
Main Methods:
- Utilized a magnetic bottle time-of-flight spectrometer for high-resolution electron detection.
- Employed fourfold coincidence measurements, detecting two photoelectrons and two Auger electrons simultaneously.
- Analyzed Auger lines to confirm the electronic states populated after DPI.
Main Results:
- Successfully identified and assigned the Xe2+ 4d(-2) double core-hole states.
- Determined a favored cross-section of approximately 0.3 MB for core-core DPI into Xe2+ 4d(-2) at 301.6 eV photon energy.
- Observed intense core-core DPI attributed to the mixing of the 4d(-2) continuum with 4p single photoionization.
Conclusions:
- The study confirms the assignments of Xe2+ 4d(-2) states through detailed coincidence measurements.
- The significant cross-section for core-core DPI highlights the importance of electronic state mixing in atomic ionization processes.
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