Related Experiment Video
Updated: Dec 28, 2025
09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
16.4K
Two-Electron Interference in Strong-Field Ionization of He by a Short Intense Extreme Ultraviolet Laser Pulse.
Wei-Chao Jiang1,2,3, Si-Ge Chen2, Liang-You Peng2,4
1College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Physical Review Letters
|February 15, 2020
Summary
Intense extreme ultraviolet laser pulses cause double ionization in helium, creating unique gridlike interference patterns in photoelectron energy spectra due to multiple ionization times. This phenomenon offers insights into multielectron dynamics.
Area of Science:
- Atomic Physics
- Quantum Mechanics
- Strong-Field Physics
Background:
- Understanding electron correlation in atomic systems is crucial.
- Investigating double ionization dynamics under intense laser fields is a key challenge.
Purpose of the Study:
- To study the double ionization of helium using intense extreme ultraviolet (XUV) laser pulses.
- To analyze the correlated energy spectrum of photoelectrons and identify novel phenomena.
Main Methods:
- Numerical solution of the full-dimensional time-dependent Schrödinger equation.
- Simulation of helium atom interaction with intense linearly polarized XUV laser pulses (> 10^18 W/cm^2).
Main Results:
- Observation of novel gridlike interference fringes in the correlated energy spectrum of two photoelectrons.
- Attribution of interference to multiple two-electron wave packets emitted at different ionization times.
- Validation of a semianalytical model for dressed two-photon double ionization in qualitatively explaining the interference patterns.
Conclusions:
- The study reveals complex interference patterns in helium double ionization by intense XUV lasers.
- These interference signatures are linked to time-delayed ionization bursts.
- Similar interference phenomena are predicted for other atomic and molecular multielectron systems.
Related Concept Videos
01:30Atomic Emission Spectroscopy: Interference
535
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
535
01:21Chemical Ionization (CI) Mass Spectrometry
1.3K
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
1.3K
01:12Electrospray Ionization (ESI) Mass Spectrometry
1.9K
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
1.9K
01:24Mass Spectrum: Interpretation
2.5K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
2.5K
01:25Atomic Absorption Spectroscopy: Interference
1.9K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
1.9K
01:27π Electron Effects on Chemical Shift: Overview
1.5K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.5K