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Related Concept Videos

Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
Bond Polarity, Dipole Moment, and Percent Ionic Character02:48

Bond Polarity, Dipole Moment, and Percent Ionic Character

Bond Polarity
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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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

Published on: August 6, 2018

Neutral-ionic state correlations in strong-field molecular ionization.

Marija Kotur1, Congyi Zhou, Spiridoula Matsika

  • 1Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.

Physical Review Letters
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Strong-field ionization of molecules is complex. Electronic rearrangement, not just simple tunneling, significantly impacts ionization outcomes, challenging existing theories.

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Area of Science:

  • Physical Chemistry
  • Quantum Mechanics
  • Atomic and Molecular Physics

Background:

  • Strong-field molecular ionization is crucial for understanding light-matter interactions.
  • Existing theories like Keldysh and ADK models often simplify the complex dynamics.
  • The role of electron-core interactions and electronic rearrangement is not fully understood.

Purpose of the Study:

  • To investigate correlations between neutral and ionic states during strong-field molecular ionization.
  • To compare simplified theoretical predictions with detailed calculations including electron-core interactions.
  • To elucidate the significance of electronic rearrangement effects in intense ultrafast laser-driven ionization.

Main Methods:

  • Comparative analysis of Dyson orbital norms and quasistatic tunneling theories (Keldysh, MO-ADK).
  • Advanced calculations incorporating Coulomb interaction between continuum electron and parent ion.
  • Inclusion of electron-core interactions causing continuum state distortions.
  • Experimental measurements on excited uracil molecules.

Main Results:

  • Electronic rearrangement effects are prominent in strong-field ionization with ultrafast lasers.
  • The outgoing electron can induce electronic transitions in the parent molecular ion.
  • Keldysh-weighted Dyson norm predictions fail for ionization to different cation states under strong fields.
  • Detailed calculations reveal deviations from simpler theoretical models.

Conclusions:

  • Simple models are insufficient for accurately describing strong-field molecular ionization.
  • Electronic rearrangement plays a critical role, influencing ionization pathways and final states.
  • Further theoretical development is needed to incorporate these complex many-body effects.