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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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.

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Related Experiment Video

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
11:45

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Electronically excited cold ion crystals.

Weibin Li1, Igor Lesanovsky

  • 1Midlands Ultracold Atom Research Centre (MUARC), School of Physics and Astronomy, The University of Nottingham, Nottingham, United Kingdom.

Physical Review Letters
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Researchers used laser excitation of ion crystals to high-lying states to achieve coherent manipulation. This enables the creation of nonclassical motional states and the study of quantum phenomena in Paul traps.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Many-body physics

Background:

  • Laser excitation of ion crystals can involve complex many-body interactions.
  • Strong coupling between electronic and vibrational dynamics is crucial in ion crystals, especially near phase transitions.

Purpose of the Study:

  • To explore the use of highly excited electronic states for coherent manipulation of ion crystals.
  • To investigate a new pathway for creating nonclassical motional states in a Paul trap.
  • To study quantum phenomena arising from strong electronic-vibrational coupling.

Main Methods:

  • Laser excitation of ion crystals to high-lying, long-lived electronic states.
  • Utilizing the strong coupling between internal electronic and external motional dynamics.
  • Employing a Paul trap for ion confinement and manipulation.

Main Results:

  • Demonstrated that laser excitation to highly excited states is a viable method for coherent ion crystal manipulation.
  • Showcased a novel approach to generating nonclassical motional states.
  • Established a platform for investigating quantum phenomena driven by strong electronic-vibrational coupling.

Conclusions:

  • Highly excited electronic states provide a powerful tool for controlling ion crystals.
  • This technique opens new avenues for quantum state engineering and fundamental quantum studies.