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Related Experiment Video

Updated: Feb 6, 2026

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

Protocol for the Solid-phase Synthesis of Oligomers of RNA Containing a 2'-O-thiophenylmethyl Modification and Characterization via Circular Dichroism

Published on: July 28, 2017

Maximum Elliptical Dichroism in Atomic Two-Photon Ionization.

J Hofbrucker^1,2, A V Volotka¹, S Fritzsche^1,2

¹Helmholtz-Institut Jena, Fröbelstieg 3, D-07743 Jena, Germany.

Physical Review Letters

|August 18, 2018

Summary

This summary is machine-generated.

Maximum elliptical dichroism, a phenomenon in atomic photoionization, can be achieved in two-photon ionization. This finding offers a new method for analyzing free-electron laser polarization states.

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Area of Science:

Atomic and Molecular Physics
Quantum Optics
Laser Physics

Background:

Elliptical dichroism quantifies differences in photoelectron angular distributions from atomic photoionization using elliptically polarized light.
Nonlinear ionization processes are sensitive to light polarization states.

Purpose of the Study:

To theoretically demonstrate the universal occurrence of maximum elliptical dichroism (|ΔED|=1) in two-photon atomic ionization.
To propose atomic helium as a model system for observing this phenomenon.
To highlight the potential application of maximum elliptical dichroism in characterizing free-electron laser (FEL) polarization.

Main Methods:

Theoretical analysis of two-photon ionization processes in atoms.
Focusing on scenarios where electron emission is dominated by two intermediate resonances.
Utilizing atomic helium as a specific case study.

Main Results:

Demonstration that maximum elliptical dichroism (|ΔED|=1) is an inherent feature of two-photon ionization under specific resonance conditions.
Identification of conditions where electron emission is primarily governed by two intermediate resonances.

Conclusions:

Maximum elliptical dichroism is achievable in two-photon ionization of any atom under resonant conditions.
This phenomenon provides a sensitive method for determining the polarization state of photon beams, particularly from FELs.