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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Valence Bond Theory

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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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Atomic Nuclei: Nuclear Spin State Overview01:03

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Related Experiment Video

Updated: Jul 8, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Inserting an "atomic trap" for directional dopant migration in core/multi-shell quantum dots.

Chun Chu1, Elan Hofman1, Chengpeng Gao1

  • 1Department of Chemistry, Syracuse University Syracuse New York 13244 USA wzhen104@syr.edu.

Chemical Science
|December 15, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed an "atomic trap" using a CdZnS interface layer to control manganese ion migration in quantum dots (QDs). This method enhances dopant migration by reducing lattice strain, enabling fine-tuning of nanomaterial properties.

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Area of Science:

  • Solid-state chemistry and materials science
  • Nanotechnology and quantum dot synthesis
  • Computational materials science

Background:

  • Ion diffusion in crystalline lattices is vital for solid-state technologies.
  • Controlling ion diffusion in nanoscale lattices presents significant challenges.
  • Dopant migration in quantum dots (QDs) impacts their properties but is difficult to manage.

Purpose of the Study:

  • To investigate a method for controlling dopant migration in core/multi-shell quantum dots (QDs).
  • To utilize an alloyed interface layer as an "atomic trap" to facilitate directional dopant migration.
  • To understand the influence of doping site and lattice environment on dopant mobility.

Main Methods:

  • Fabrication of core/multi-shell quantum dots with an inserted CdZnS alloyed interface layer.
  • Experimental observation and analysis of manganese (Mn(ii)) dopant migration.
  • Density functional theory (DFT) calculations to determine energy barriers for dopant hopping.

Main Results:

  • The CdZnS interface layer effectively acted as an "atomic trap," facilitating controlled Mn(ii) dopant migration.
  • Dopant migration was significantly influenced by the host lattice site; larger Cd(ii) sites promoted migration, while smaller Zn(ii) sites inhibited it.
  • DFT calculations confirmed higher energy barriers for Mn(ii) hopping from smaller Zn substitutional sites compared to larger Cd sites.

Conclusions:

  • Controlled dopant migration via "atomic trapping" is achievable in QDs using an alloyed interface layer.
  • The initial doping site and local lattice distortion critically influence dopant mobility and stability.
  • This approach offers a novel strategy for tuning the properties of doped nanomaterials.