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Sudden interchannel interaction in the Tl 6p ionization above the 5d threshold
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, D-14195 Berlin, Germany.
Physical Review Letters
|December 2, 2000
Summary
We measured magnetic dichroism and spin polarization of thallium photoelectrons. Strong interchannel coupling effects were observed above the Tl 5d threshold, differing from xenon ionization.
Area of Science:
- Atomic Physics
- Photoionization Dynamics
- Quantum Mechanics
Background:
- Understanding photoionization processes is crucial for atomic physics.
- Subvalence shell excitations exhibit complex interchannel coupling effects.
- Previous studies on xenon (Xe) provided a baseline for comparison.
Purpose of the Study:
- To investigate linear magnetic dichroism and dynamical spin polarization in thallium (Tl) 5d and 6p photoelectrons.
- To explore interchannel coupling effects in Tl photoionization above the 5d threshold.
- To compare resonant (Xe 4d) and nonresonant (Tl 5d) excitations from subvalence shells.
Main Methods:
- Measurement of linear magnetic dichroism in angular distribution.
- Measurement of dynamical spin polarization of photoelectrons.
- Photoelectron spectroscopy in the energy range of 30-50 eV.
Main Results:
- Observed distinct linear magnetic dichroism in Tl 5d and 6p photoelectrons.
- Demonstrated strong interchannel coupling effects above the Tl 5d threshold.
- Found a sudden increase in the asymptotic phase difference for Tl 6p ionization.
Conclusions:
- Valence excitation differs significantly between resonant and nonresonant subvalence shell ionization.
- Interchannel coupling plays a critical role in shaping photoelectron angular distributions and spin polarization.
- The findings provide new insights into the complex dynamics of photoionization.
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