Spin-only Magnetic Moment
Spin-only Magnetic Moment - Related Videos
01:23
Magnetic Moment of an Electron
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2025
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
07:33
Magnetic Resonance Spectroscopy of live Drosophila melanogaster using Magic Angle Spinning
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Cited by 5 •
2010
This technique enables the use of high-resolution magic angle spinning proton MR spectroscopy (HRMAS 1H-MRS) for molecular characterization of live Drosophila melanogaster with a conventional 14.1 tesla spectrometer equipped with an HRMAS probe.
00:59
Atomic Nuclei: Nuclear Magnetic Moment
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2024
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
12:29
Magnetic Resonance Imaging Quantification of Pulmonary Perfusion using Calibrated Arterial Spin Labeling
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Cited by 18 •
2011
A MR imaging method to study the distribution of pulmonary blood flow under a variety of physiological conditions, in this case exposure to three different inspired oxygen concentrations: hypoxia, normoxia, and hyperoxia, is described. This technique utilizes human pulmonary physiology research techniques in an MR scanning environment.
01:08
Spin–Spin Coupling Constant: Overview
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2024
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1. Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
FAQs
The number of unpaired electrons, n, determines the value through μ = √[n(n + 2)] Bohr magnetons. Because n appears inside a nonlinear expression, adding an unpaired electron changes the predicted moment according to the full equation rather than through a simple one-to-one scale. The calculation therefore provides a quantitative way to compare different electron configurations.
The spin-only calculation assumes that orbital contributions to magnetism are negligible. If an experimental magnetic moment differs from the calculated value, that comparison may indicate that this assumption is not fully adequate for the atom, ion, or complex being studied. The difference becomes scientifically useful because it helps chemists evaluate the electronic model rather than treating the calculated number as universally exact.
High-spin and low-spin arrangements contain different numbers of unpaired electrons, so they produce different spin-only values. Comparing the values associated with possible arrangements allows chemists to assess which electron configuration better matches a coordination compound. This links magnetic behavior to ligand-field effects, since those effects influence the electronic arrangement used in interpreting the compound.
First determine the number of unpaired electrons in the atom, ion, or coordination complex under consideration. Substitute that number for n in μ = √[n(n + 2)] and report the result in Bohr magnetons. The calculated value can then be compared with an experimental magnetic measurement to test the proposed electron configuration or spin arrangement.
A measured magnetic moment can be compared with values calculated for possible electron configurations. If one configuration gives a better match, the result supports the associated oxidation state and number of unpaired electrons. In transition-metal chemistry, this approach therefore connects magnetic data with assignments that may otherwise remain uncertain from the compound's composition alone.
Magnetic susceptibility data provide experimental information about how a substance responds magnetically, while the spin-only calculation supplies a reference based on its unpaired electrons. Comparing the two helps chemists judge whether the proposed electronic structure is reasonable and whether neglected orbital contributions may matter. This makes the calculation an interpretive tool rather than merely an isolated numerical exercise.
The calculated moment gives insight into the electronic structures of inorganic materials by relating their magnetic behavior to unpaired electrons. In coordination compounds, comparison with experimental results can also support interpretations of bonding and ligand-field effects. Consequently, magnetic measurements help connect observable properties with electron configurations and the chemical interactions that shape them.