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Related Concept Videos

Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Bond Dissociation Energy and Activation Energy

Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
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Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Low-energy dissociative recombination in small polyatomic molecules.

Ch Jungen1, S T Pratt

  • 1Laboratoire Aimé Cotton du CNRS, Bâtiment 505, Université de Paris-Sud, F91405 Orsay, France. stpratt@anl.gov

The Journal of Chemical Physics
|December 15, 2010
PubMed
Summary

Indirect dissociative recombination involves electron capture into excited Rydberg states. Vibrational autoionization properties predict thresholds in recombination rates, particularly for molecular ions like H3(+).

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Area of Science:

  • Atomic and Molecular Physics
  • Chemical Physics
  • Plasma Physics

Background:

  • Indirect dissociative recombination (DR) is a key process for low-energy electrons and molecular ions.
  • This process often involves capture into vibrationally excited Rydberg states.

Purpose of the Study:

  • To explore general ideas about indirect recombination using vibrational autoionization properties.
  • To illustrate these ideas with literature examples and discuss rotational effects.

Main Methods:

  • Utilizing properties of vibrational autoionization (the inverse of capture).
  • Applying the Δv = -1 propensity rule for vibrational autoionization.
  • Analyzing low-temperature experimental data for H(3)(+) dissociative recombination.

Main Results:

  • Vibrational autoionization's Δv = -1 rule predicts thresholds in DR cross sections and rates.
  • These thresholds correspond to vibrational energy levels.
  • Rotational effects in DR of H(3)(+) are examined.

Conclusions:

  • Vibrational autoionization characteristics provide insights into indirect dissociative recombination mechanisms.
  • The Δv = -1 rule is crucial for understanding DR thresholds.
  • Rotational excitation plays a role in low-temperature DR processes.