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Related Concept Videos

Ionization Energy03:12

Ionization Energy

32.7K
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:
32.7K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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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,...
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Escape Velocities of Gases01:19

Escape Velocities of Gases

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To escape the Earth's gravity, an object near the top of the atmosphere at an altitude of 100 km must travel away from Earth at 11.1 km/s. This speed is called the escape velocity. The temperature at which gas molecules attain the rms speed, which is equal to the escape velocity, can be estimated by using the equation for the average kinetic energy of the gas molecules. According to the kinetic theory of gas, the average kinetic energy of the gas molecules is proportional to its...
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

1.2K
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
1.2K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Continuous Charge Distributions01:17

Continuous Charge Distributions

7.1K
Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
7.1K

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Relativistic runaway ionization fronts.

A Luque1

  • 1Instituto de Astrofísica de Andalucía, IAA-CSIC, P.O. Box 3004, 18080 Granada, Spain.

Physical Review Letters
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

Researchers discovered relativistic runaway ionization fronts, moving near light speed, which accelerate electrons to create power-law energy distributions. These fronts may explain features observed in terrestrial gamma-ray flashes.

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Area of Science:

  • Plasma physics
  • High-energy astrophysics
  • Particle acceleration

Background:

  • Relativistic effects in plasmas are crucial for understanding extreme astrophysical phenomena.
  • Ionization fronts are key structures in plasma evolution and particle acceleration.

Purpose of the Study:

  • To investigate the first observed self-consistent impact ionization fronts propagating at relativistic speeds.
  • To characterize the behavior and particle acceleration mechanisms of these fronts.

Main Methods:

  • Numerical simulations of relativistic plasma interactions.
  • Development of a simplified analytical model for electron selection.

Main Results:

  • Observed ionization fronts propagating at speeds within 1% of the speed of light.
  • Identified stochastic selection of high-energy electrons leading to power-law energy distributions.
  • A simplified model explains electron selection via Coulomb scattering.

Conclusions:

  • Relativistic runaway ionization fronts exhibit unique particle acceleration properties.
  • These fronts may be linked to terrestrial gamma-ray flashes, explaining observed spectral tails.