Related Experiment Videos
Quantifying relativistic interactions from angular momentum partitioning measurements during photoionization
O Yenen1, K W McLaughlin, D H Jaecks
1Behlen Laboratory of Physics, University of Nebraska-Lincoln, 68588-0111, USA.
Physical Review Letters
|February 15, 2001
Summary
Circularly polarized synchrotron radiation was used to study argon ion helicity. Relativistic interactions were observed during photoionization, influencing the spin of the ion-photoelectron system.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Spectroscopy
Background:
- Investigating photoionization processes in atomic systems.
- Understanding the role of electron correlation and relativistic effects in atomic spectra.
- Studying excited states of Argon ions (Ar+).
Purpose of the Study:
- To measure the helicity of fluorescent radiation from a specific excited state of Ar+.
- To analyze the partitioning of angular momentum during photoionization.
- To identify evidence of relativistic interactions in the photoionization of Ar.
Main Methods:
- Utilizing circularly polarized synchrotron radiation as the excitation source.
- Forming the Ar+ [3p4[3P]4p] 2P(o)1/2 state via double excitations.
- Measuring the degree of helicity of the emitted fluorescent radiation.
- Analyzing angular momentum coupling and spin interactions.
Main Results:
- Observed a nonvanishing expectation value for the total spin of the residual ion-photoelectron system.
- Demonstrated significant relativistic interactions during the photoionization process.
- Characterized the helicity of fluorescent radiation from the excited Ar+ state.
Conclusions:
- Relativistic effects play a crucial role in the photoionization of Argon, even in states formed by double excitations.
- The observed spin polarization provides direct evidence of these relativistic interactions.
- Angular momentum partitioning offers insights into the complex dynamics of photoionization.