Related Experiment Video
Updated: May 26, 2026

An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Competitive ionization processes of anthracene excited with a femtosecond pulse in the multi-photon ionization regime
1Department of Physics, University of Gothenburg, 41296 Gothenburg, Sweden. motoshi.goto@physics.gu.se
Abstract:
To clarify the ionization mechanism of large molecules under multi-photon ionization conditions, photo-electron spectroscopic studies on anthracene have been performed with electron imaging technique. Electron kinetic energy distributions below a few eV reveal that three kinds of ionization channels coexist, viz., vertical ionization, ionization from Rydberg states, and thermionic hot electron emission. Their relative yield is determined by the characteristic of the laser pulse. The duration in particular influences the ratio between the first two processes, while for higher intensities the last process dominates. Our results provide strong evidence that internal conversion plays an important role for the ionization of the molecule.
Related Concept Videos
Chemical Ionization (CI) Mass Spectrometry
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Deactivation Processes: Jablonski Diagram
Atomic Emission Spectroscopy: Overview
Atomic Absorption Spectroscopy: Atomization Methods

