Determination Of Magnetic Moment Research Articles

MAGNETIC FORM FACTOR STUDIES OF ACTINIDE COMPOUNDS

Investigations on form factor, magnetic moment and valence state determination were carried out on NpO2, NpAs2 and UNi2 compounds. First results are presented but must be improved due to the smallness of the samples.

Possible applications of the steering of charged particles by bent single crystals

This article reviews some aspects of the steering of charged particles using channeling in bent crystals. Crystal angular and spatial acceptance, deflection, dechanneling, and radiation damage are discussed. Examples of possible bent crystal applications are presented including extraction, beam transport, focusing, the possibility of charm particle separated beams, and magnetic moment determination.

Light scattering determination of magnetic moments of magnetotactic bacteria (invited)

Light scattering is used to determine the average lengths and magnetic moments of magnetotactic bacteria in culture. The results are consistent with estimates made from electron micrographs.

Potassium perchromate standard for determination of paramagnetic spin concentration, g values, and magnetic moments of fossil fuels

During electron paramagnetic resonance (EPR) studies of shales and related samples, it was found that the signals from these samples overlapped strongly those of the internal standards commonly available, such as DPPH (1,1-diphenyl-2-picryl-hydrazyl), nitroxides, and pitch. This paper reports that K/sub 3/CrO/sub 8/ (potassium perchromate), a Cr(V):3d paramagnetic compound can serve as a versatile internal standard for measuring paramagnetic spin concentration and g values of organic free radicals by EPR spectroscopy and for determining magnetic moments by static magnetic susceptibility techniques.

New techniques for magnetic moment measurements of short-lived excited states

The hyperfine interactions between fast ions moving through a magnetized medium and their electronic environment lead to very large magnetic fields at the nucleus. These fields have been exploited in the measurement of magnetic moments of very short-lived excited nuclear states. The present understanding of the origin and dynamic behavior of these fields is reviewed. The techniques used for the determination of magnetic moments are described and examples displaying the scope and limitations of the technique are presented. Strong directional hyperfine interactions are also manifested as fast ions exit into vacuum from foils tilted with respect to the beam. These phenomena have also been applied successfully to the measurement of nuclear magnetic moments and are briefly discussed.

Dimeric 5-and 6-coordinate complexes of tri and tetradentate ligands

Orthohydroxyacetophenone-picolinoylhydrazone (APH) and orthohydroxy-acetophenone-isonicotinoly hydrazone (AIH) react with divalent nickel and cobalt salts in methanolic medium and give complexes of the type [M(APH)X] 2 and [M(AIH)X] 2 where MNi(II) and Co(II), XCl, Br, NO 3, NCS or H 2O, depending upon the pH of the reaction mixture. The compounds are characterised by elemental analyses, conductance, molecular weight, magnetic, electronic and IR (including far. IR) spectral studies. The ligands act as tetra (APH) and tri (AIH)-dentate, conforming to 6 or 5-coordinate geometries at low and high pH. The IR spectral studies, molecular weight determination and subnormal values of magnetic moments indicate the dimeric nature of these complexes. The electronic spectra are consistent with the proposed stereochemistries. The complexes, however, have lower symmetries and the amount of distortion in terms of DT/DQ, applying NSH “Hamiltonian Theory” has been evaluated which indicate that the complexes are moderately distorted.

On the determination of the Hermaean magnetic moment: A critical review

The determination of Mercury's magnetic moment from the spatially and temporally limited observations obtained by the Mariner 10 mission is dependent upon the assumed nature of both the intrinsic planetary magnetic field and that of the magnetospheric current systems. In this paper the methods that have been used for this purpose are reviewed. The results that have been obtained are then considered in comparison with the constraints placed on the planetary field by the solar wind dynamic pressures and stand-off distances inferred from the Mariner 10 magnetic field data by Slavin and Holzer (1979) which are consistent with an effective dipole moment of 6 ± 2 × 10 22 G cm 3. It is found that the models which fit the observations with substantial quadrupole and octupole moments are not consistent with the magnetospheric boundary conditions, presumably owing to incorrect assumptions regarding the magnetopause position, incorrect assumptions regarding solar wind dynamic pressure, and/or averaging over temporal variations in the Mariner 10 data.

Determination of spin, magnetic moment and isotopic shift of neutron rich205Hg by optical pumping

Neutron rich205Hg (T 1/2=5.2 min) was produced and on-line mass separated at the ISOLDE facility at CERN. The polarization achieved by optical pumping via the atomic line (6s 21 S 0↔6s6p 3 P 1,λ=2 537A) was monitored by theβ decay asymmetry. Hyperfine structure and isotopic shift of the205Hg absorption line was determined by Zeeman scanning. In addition a magnetic resonance was performed on the polarized205Hg nuclei in the atomic ground state. The results are: $$I(^{205} Hg) = \tfrac{1}{2}$$ (confirmed);μ I (205Hg)=0.5915 (1)μ N (uncorrected for diamagnetism); isotopic shiftδv204/205=v(205Hg)-v(204Hg)=−1.8 (1) GHz.μ I and IS are discussed briefly in the frame of current literature.

An Uncertainty in Magnetic Moment Determination Imposed by Powder Neutron‐Diffraction Method

physica status solidi (b)Volume 71, Issue 1 p. K99-K100 Short Note An Uncertainty in Magnetic Moment Determination Imposed by Powder Neutron-Diffraction Method A. M. Murasik, A. M. Murasik Institute of Nuclear Research, Świerk Research Establishment, WarsawSearch for more papers by this author A. M. Murasik, A. M. Murasik Institute of Nuclear Research, Świerk Research Establishment, WarsawSearch for more papers by this author First published: 1 September 1975 https://doi.org/10.1002/pssb.2220710164AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume71, Issue11 September 1975Pages K99-K100 RelatedInformation

ChemInform Abstract: TRINUCLEAR INTERMEDIATES ISOLATED IN THE REACTIONS OF BIS(ACETYLACETONATO)‐NICKEL(II) WITH DRY HYDROGEN BROMIDE

AbstractIn Mischungen von Dichlormethan und Petroläther bei Zimmer‐ oder tieferen Temperaturen und bei Verwendung geringer Mengen HBr können aus der sonst zu wasserfreiem Nißr, führenden Reaktion von Bis‐[acetylacetonato]‐nickel mit wasserfreiem HBr die Produkte (I) bis (III).

Trinuclear Intermediates Isolated in the Reactions of Bis(acetylacetonato)-nickel(II) with Dry Hydrogen Bromide

Abstract The reactions of bis(acetylacetonato)nickel(II) with restricted amounts of dry hydrogen bromide have been performed in appropriate mixtures of dichloromethane and petroleum ether at room temperature or lower in order to isolate the intermediary products, Ni3Br(acac)5, Ni3Br2(acac)4, and Ni3Br4(acac)2. The essentially octahedral trinuclear structure of Ni3Br(acac)5 was established on the basis of elemental analysis, by molecular-weight and magnetic-moment determinations, and by studying the electronic and IR spectra. Ni3Br2(acac)4 and Ni3Br4(acac)2 were characterized less satisfactorily because of their lower solubilities. The reactions of these mixed complexes with pyridine have also been examined; a new complex NiBr(acac)(py)3 was thus obtained in addition to the known compound, Ni(acac)2(py)2.

Precision Magnetic Moment Determinations for 43-minHg199mand Other Isomers of Mercury

Precision Magnetic Moment Determinations for 43-min<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Hg</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mn>9</mml:mn><mml:mn>9</mml:mn><mml:mi>m</mml:mi></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and Other Isomers of Mercury

Perturbed Angular Correlation of Gamma Rays

When radiative decay takes place through a three-level system via the successive emission of two photons, an angular correlation may exist between their propagation directions k, and k2• For a system in field-free space this correlation depends upon, and contains information about, radiation param­ eters alone, i.e. spins and transition multipolarities. The angular correlation may be perturbed, however, if the intermediate level of the three-level system can interact with the environment. Studies of perturbed angular correlations (PAC) can yield useful information either about the system itself or about its environment. Many examples could be given illustrating the application of PAC in molecular, atomic, nuclear, and even mesic systems. In fact with a little generalization all optical pumping and double resonance experiments could be treated within the same formalism. Such generalization is useful and instructive, but it lies outside the scope of this article, which deals with PAC of gamma quanta emitted in nuclear decay. Gamma-ray angular correlations have been of interest in nuclear physics for over three decades. In 1 940 Hamilton (1) gave a theoretical description of angular correlations. The first successful experiments were reported by Brady & Deutsch (2) in 1 947. Goertzel (3) described perturbed angular correlations in 1946, and Frauenfelder et al (4) reported the observation of perturbations in 1 951 . Comprehensive theoretical descriptions of perturbed angular correla­ tions were presented in 1953 by Alder et al (5) and by Abragam & Pound (6), among others. Many other workers contributed to thc development of per­ turbed angular correlations in this period. In the years that followed, nuclear physicists applied this method widely to the determination of nuclear magnetic dipole moments. Frauenfelder & Steffen gave a detailed discussion of the development of the field in their extensive review article (7) published in 1 965. Their article also contains a thorough and lucid description of the theory of

Anomalous Magnetic Moment of the Charged Intermediate Vector Boson

Assuming that the intermediate vector boson for weak interactions has no strong interactions, we reinvestigate the Corben-Schwinger problem of the scattering of a charged vector meson with anomalous magnetic moment by an external static Yukawa potential, or in particular a static Coulomb field. Meixner's corner condition of finite integrated energy in every bounded region is applied in the neighborhood of the singularity of the Yukawa potential, and it is found that the Corben-Schwinger problem, although nonrenormalizable, possesses a finite, unique solution if and only if the anomalous magnetic moment is larger than unity. It is therefore a characteristic of nonrenormalizable theories that there may be lower bounds to coupling constants. Experimental determination of the anomalous magnetic moment of the intermediate vector boson is thus of great importance. Furthermore, because certain differential equations happen to be solvable in terms of Bessel functions, an explicit perturbation expansion for weak coupling can be given for this scattering process.

Infrared Spectra of α‐Thenoyl‐trifluoroacetonates of Metal Ions of the First Transition Series

AbstractThe IR. spectra of α‐thenoyl‐trifluoroacetone (HTTA) and seventeen of its chelates with metal(II) and ‐(III) ions of the first transition series have been determined. Three series of complexes are represented: the anhydrous metal(II) species, [M(TTA)2]n (M  Ca, Mn, Co, Ni, Cu, Zn); metal(II) dihydrates, [M(TTA)2(H2O)2] (M  Mn, Fe, Co, Ni, Zn); and the metal(III) chelates, [M(TTA)3] (M  Sc, V, Cr, Mn, Fe, Ga). For each metal(II) complex, the spectra of the anhydrous and hydrated compounds are practically identical, suggesting that the anhydrous complexes have the polynuclear octahedral structure established for the corresponding acetylacetonates. Magnetic moment determinations reveal that complexes of the 3d4−3d7 ions all have spin‐free configuration. Several vibrational bands with frequencies &lt; 700 cm−1 are found to exhibit a frequency variation with d‐orbital population which is consistent with the order of crystal field stabilization energies and hence with their assignment as coupled metal‐oxygen stretching modes. Unique features of the spectra of [Cu(TTA)2] and [Mn(TTA)3] are ascribed to structural differences arising from Jahn‐Teller distortion. Tentative assignments for the majority of the ligand vibrations are given.

Erratum: The Molecular Zeeman Effect and the Determination of the Molecular Magnetic Moments (g Values), Magnetic Susceptibilities, and Molecular Quadrupole Moments in Methyl Formate and Glycolaldehyde

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Determination of magnetic moments of paramagnetic ions in microgram quantities using ion-exchange resins

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of magnetic moments of paramagnetic ions in microgram quantities using ion-exchange resinsToshio Ikeda, Sumio Oe, and Kazuaki YamanariCite this: J. Phys. Chem. 1971, 75, 19, 2981–2986Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://doi.org/10.1021/j100688a018RIGHTS & PERMISSIONSArticle Views60Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (642 KB) Get e-Alerts

The molecular Zeeman effect in diamagnetic molecules and the determination of molecular magnetic moments (gvalues), magnetic susceptibilities, and molecular quadrupole moments

The experimental and theoretical literature on the molecular Zeeman effect is surveyed. The observation of the linear (H) and quadratic (H 2) Zeeman effect leads to a direct determination of the molecular g values, magnetic susceptibility anisotropies and molecular quadrupole moments. The recent results are discussed and the available molecular g values, magnetic susceptibility anisotropies, and molecular quadrupole moments are tabulated.

Molecular Zeeman Effect and the Determination of the Molecular Magnetic Moments (g Values), Magnetic Susceptibilities, and Molecular Quadrupole Moments in Methyl Formate and Glycolaldehyde

The high-field first- and second-order Zeeman effect has been observed in methyl formate and glycolaldehyde. The molecular parameters in the inertial axis system for both molecules are listed below. Only the relative signs of the molecular g values are obtained experimentally. However, the absolute signs are conclusively assigned in both molecules by an analysis of the second moment of the charge distribution or molecular quadrupole moments. For methyl formate, the measured g values and magnetic susceptibility anisotropies are gaa = − 0.1267 ± 0.0013, gbb = − 0.0391 ± 0.0010, gcc = − 0.0168 ± 0.0017, 2χaa − χbb − χcc = (11.0 ± 1.0) × 10−6erg/G2·mol, and 2χbb − χcc − χaa = (3.1 ± 1.0) × 10−6erg/G2·mol. The molecular quadrupole moments are Qaa = (2.3 ± 0.8), Qbb = (4.2 ± 1.0), and Qcc = − (6.5 ± 1.3) all in units of 10−26 esu·cm2. For glycolaldehyde, the measured g values and magnetic susceptibility anisotropies are gaa = − 0.1239 ± 0.0013, gbb = − 0.0726 ± 0.0010, gcc = − 0.0178 ± 0.0010, 2χaa − χbb − χcc = (7.1 ± 2.5) × 10−6erg/G2·mol, and 2χbb − χcc − χaa = (18.8 ± 2.0) × 10−6erg/G2·mol. The molecular quadrupole moments are Qaa = − (5.6 ± 2.0), Qbb = (3.8 ± 1.8) and Qcc = (1.8 ± 3.3) in units of 10−26 esu·cm2. Using the molecular structures allows a determination of the diagonal elements in the paramagnetic susceptibility tensor and the anisotropies in the second moment of the charge distribution. Using the bulk susceptibilities, gives the diagonal elements in the total magnetic susceptibility tensor and the individual elements of the second moment of the charge distribution. The results in these two molecules are compared to similar systems.

Determination of Magnetic Moments of Copper Ions in Water by the Viscometer Method

Abstract The viscometer method was applied to determine the magnetic susceptibilities of aqueous solutions of cupric salts. The effective magnetic moments of the cupric ions obtained were in agreement with values in literature, except for cupric nitrate and acetate. The former showed a relatively high value and the latter gave variable values, which suggest some dimerization effect occuring in aqueous solution with increasing concentration.