Related Experiment Video
Updated: Jun 8, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Elliptical polarization and probability of double ionization
1Department of Physics and Astronomy, University of Rochester, Rochester Theory Center, Rochester, New York 14627, USA. wangxu@pas.rochester.edu
Physical Review Letters
|September 28, 2010
Summary
The ellipticity of laser pulses influences the timing of electron double ionization. Higher ellipticity narrows the ionization window, enabling a new formula to predict double ionization probability based on laser ellipticity.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Quantum Mechanics
- Laser Physics
Background:
- Strong-field laser-matter interactions are crucial for understanding atomic and molecular processes.
- Nonsequential double ionization (NSDI) is a complex phenomenon where two electrons are ejected from an atom or molecule by a single laser pulse.
- The polarization state of intense laser pulses significantly affects ionization dynamics.
Purpose of the Study:
- To investigate the relationship between the elliptical polarization of intense short laser pulses and the timing of strong-field nonsequential double ionization.
- To develop an experimentally testable formula for predicting double ionization probability as a function of laser ellipticity.
Main Methods:
- Theoretical analysis of strong-field laser-matter interactions.
- Modeling the dynamics of nonsequential double ionization under elliptically polarized laser fields.
- Derivation of a formula relating double ionization probability to laser ellipticity.
Main Results:
- The degree of elliptical polarization directly correlates with the timing of nonsequential double ionization.
- Increased ellipticity compresses the initiation of double ionization into a narrower time window.
- This temporal compression unexpectedly influences the ionizing field strength, leading to a predictable outcome.
Conclusions:
- Laser pulse ellipticity provides a new control parameter for manipulating nonsequential double ionization.
- The derived formula offers a novel and experimentally verifiable method to determine double ionization probability based on ellipticity.
- This work advances the fundamental understanding of electron correlation in strong laser fields.
More Related Videos
Related Concept Videos
01:29Potential Due to a Polarized Object
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
01:17Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
03:12Ionization Energy
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
01:20IR Spectrum Peak Intensity: Dipole Moment
The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...
01:31Dielectric Polarization in a Capacitor
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
01:28Induced Electric Dipoles
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...