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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...
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...
Alkali Metals03:06

Alkali Metals

Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals

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Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping
09:40

Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping

Published on: August 26, 2010

Conduction electron spin resonance in AlB2.

L M Holanda1, L Mendonça-Ferreira, R A Ribeiro

  • 1Instituto de Fisica Gleb Wataghin, UNICAMP, Campinas, SP, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 1, 2013
PubMed
Summary
This summary is machine-generated.

Electron spin resonance experiments confirm conduction electron spin resonance in aluminum diboride (AlB2). The signal

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Phase-Dependent Control of Trap Depth and Persistent Luminescence in Strontium Aluminate Phosphors

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Hexagonal aluminum diboride (AlB2) possesses a layered honeycomb structure.
  • Conduction electron spin resonance (CESR) is a sensitive probe of electron dynamics in metals.
  • Understanding CESR in AlB2 can provide insights into electron behavior in related materials.

Purpose of the Study:

  • To investigate and confirm the presence of conduction electron spin resonance in oriented single crystals of AlB2.
  • To characterize the temperature dependence of the CESR signal in AlB2.
  • To explore the relationship between CESR and electronic structure in layered borides.

Main Methods:

  • X-band electron spin resonance (ESR) spectroscopy on oriented single crystals of AlB2.
  • Measurement of temperature-dependent anisotropic linewidth (ΔH) and g-value.
  • Comparison of experimental results with theoretical calculations of electronic structure.

Main Results:

  • Observed metallic Dysonian resonance in X-band ESR spectra of AlB2.
  • CESR signal showed g-value and intensity independent of temperature.
  • Thermal broadening of the anisotropic ESR linewidth (ΔH) correlated with electrical resistivity below 100 K.

Conclusions:

  • Confirmed the observation of conduction electron spin resonance in AlB2.
  • Concluded that covalent B-B layers in layered honeycomb structures are likely to produce CESR signals.
  • Suggested that this finding may illuminate CESR-like signals in complex f-electron systems like β-YbAlB4.