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Related Experiment Video

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Two-photon inner-shell ionization in the extreme ultraviolet.

V Richardson¹, J T Costello, D Cubaynes

¹School of Physical Sciences and NCPST, Dublin City University, Dublin 9, Ireland.

Physical Review Letters

|September 28, 2010

Summary

Researchers observed Xenon (Xe) atoms absorbing two extreme-ultraviolet photons, causing inner-shell ionization. This two-photon absorption process was confirmed using photoelectron spectroscopy.

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Area of Science:

Atomic physics
Quantum mechanics
Photonics

Background:

Inner-shell ionization is crucial for understanding atomic structure.
Extreme-ultraviolet (XUV) photons interact strongly with matter.
Free electron lasers provide intense, tunable XUV radiation.

Purpose of the Study:

To investigate the simultaneous absorption of two XUV photons by Xenon atoms.
To characterize the resulting inner-shell ionization process.
To analyze the photon energy dependence of the absorption.

Main Methods:

Experiments conducted at the Short-Wavelength Free Electron Laser Facility (FLASH).
Photoelectron spectroscopy used to detect and identify ionized electrons.
Varying pulse energy to study intensity dependence.

Main Results:

Observed simultaneous absorption of two 93 eV XUV photons by Xe atoms.
Identified ionization from the Xe 4d subshell.
Demonstrated a quadratic intensity dependence, confirming two-photon absorption.

Conclusions:

Two-photon inner-shell ionization of Xe is experimentally verified.
Results align with theoretical predictions and ion spectroscopy data.
Provides insights into multi-photon processes in atoms at high intensities.