scholarly journals ELECTRONIC POLARIZABILITIES OF NEODYMIUM AND ERBIUM MALEATES HYDRATED

2011 ◽  
Vol 08 (16) ◽  
pp. 67-73
Author(s):  
Francisco José Santos LIMA ◽  
Roseane Maria de MELO ◽  
Ademir Oliveira da SILVA
Keyword(s):  
Electric Field ◽  
Oscillator Strength ◽  
Coordination Compound ◽  
Electronic Transition ◽  
Low Energy ◽  
Ligand Field ◽  
Metallic Ions ◽  
Electronic Cloud ◽  
Spectral Area

The oscillator strength and the polarizability electronic have been used to evaluate modifications in the levels of energy of metallic ions in the coordination compound. The first property evaluates the disturbance in the states of energy caused by the force of the ligand field of the groups of atoms that are linked with the metal. The second property evaluates the easiness in which the electric field of the radiation promotes an electronic transition. In this work they were appraised these properties for the neodymium and erbium hydrated maleates. In agreement with the results, it was possible to observe that there is a significant increase in the deformation of the electronic cloud of the ion Nd3+, in the transition of smaller energy. In the erbium maleate an increase was also observed in the polarizability, in the transition of smaller energy.. We ended that, in these systems, the spectral area of low energy influenced more in the deformation of the electronic cloud of the species.

scholarly journals ELECTRONIC POLARIZABILITIES OF Nd 3+ and Er 3+ IONS IN SALTS Ln (ReO 4 ) 3 .9H 2 O AND ITS COMPLEXES WITH METHYLMORPHOLIN-N-OXIDE (MMNO) AS BINDING

2008 ◽  
Vol 05 (10) ◽  
pp. 46-50
Author(s):  
F.J.S LIMA ◽  
A.G. SILVA ◽  
V.D. SANTOS ◽  
D.C. LIRA
Keyword(s):  
Oscillator Strength ◽  
Electronic Spectra ◽  
Electronic Transition ◽  
Coordination Compounds ◽  
Electronic Polarizability ◽  
Electronic Cloud ◽  
Methanol Solutions ◽  
Dipole Polarizabilities

Electronic polarizability evaluates the deformation caused in the electronic cloud of a species, when it happens an electronic transition, usually due to the interaction of the radiation electromagnetic with the matter. Due to diversity of applications, experiments have been accomplished by our group, for the obtaining of the values of dipole polarizabilities starting from electronic spectra of the coordination compounds. In this work, they were appraised the electronic polarizabilities of the íons Nd3+ and Er3+ in the compounds Ln(ReO4)3(H2O)9 and Ln(ReO4)3(MMNO)6, where Ln = Nd and Er in methanol solutions. The programs SIMP2FOS and POLAZ-F were used to evaluate the oscillator strength experimental and for the study of the polarizabilities, respectively.

scholarly journals Breaching the Axial Limits in Ln(III) Single-Ion Magnets Using External Electric Field

2020 ◽  
Author(s):  
Arup Sarkar ◽  
Rajaraman Gopalan
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Barrier Height ◽  
Electric Fields ◽  
Single Molecule ◽  
Information Storage ◽  
Fine Tuning ◽  
Ligand Field ◽  
Nano Technology ◽  
Technology Applications

<i>Single-Molecule Magnets have potential applications in several nano-technology applications including in high-dense information storage devices and realization of this potential application lies in enhancing the barrier height for magnetization reversal (U<sub>eff</sub>). Recent literature examples suggest that the maximum values that one can obtain using a ligand field are already accomplished. Here we have explored using a combination of DFT and ab initio CASSCF calculations, the way to enhance the barrier height using an oriented external electric field for top three Single-ion Magnets ([Dy(Py)<sub>5</sub>(O<sup>t</sup>Bu)<sub>2</sub>]<sup>+</sup> (<b>1</b>) and [Er{N(SiMe<sub>3</sub>)<sub>2</sub>}<sub>3</sub>Cl]<sup>-</sup> (<b>2</b>) and [Dy(Cp<sup>Me3</sup>)Cl] (<b>3</b>)). For the first time our study reveals that, for apt molecules, if appropriate direction and value of electric fields are chosen, the barrier height could be enhanced twice that of the limit set by the ligand field. This novel non-chemical-fine tuning approach to modulate the magnetic anisotropy is expected to yield new generation SIMs.</i>

Migration-assisted, moisture gradient process for ultrafast, continuous CO2 capture from dilute sources at ambient conditions

2022 ◽  
Author(s):  
Aditya Prajapati ◽  
Rohan Sartape ◽  
Tomás Rojas ◽  
Naveen K. Dandu ◽  
Pratik Dhakal ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Electric Field ◽  
Co2 Capture ◽  
Moisture Gradient ◽  
Low Energy ◽  
Ambient Conditions ◽  
Capture Process ◽  
Low Energy Consumption

An ultrafast, continuous CO2 capture process driven by moisture gradient and electric field with low energy consumption to capture and concentrate CO2 from dilute sources.

On the effects of the Lorentz symmetry violation in a magnetic medium at a low energy scenario

2018 ◽  
Vol 33 (36) ◽  
pp. 1850216
Author(s):  
K. Bakke ◽  
C. Salvador ◽  
H. Belich
Keyword(s):  
Magnetic Field ◽  
Scalar Field ◽  
Electric Field ◽  
Anharmonic Oscillator ◽  
Lorentz Symmetry ◽  
Low Energy ◽  
Symmetry Violation ◽  
Magnetic Medium ◽  
Energy Scenario ◽  
The Magnetic Field

It is analyzed the influence of a fixed background that breaks the Lorentz symmetry on the scalar field in the nonrelativistic regime. It is considered a medium with a nonuniform magnetization and the presence of an induced electric field. Then, due to the effects of the Lorentz symmetry violation, it is shown that the interaction of the scalar field with the magnetic field (produced by the nonuniform magnetization) and the induced electric field yields an effective potential analogous to the double anharmonic oscillator. Thereby, a discrete spectrum of energy can stem from the effects of the violation of the Lorentz symmetry on the scalar field.

Solvent Effects on Nonradiative Relaxation Dynamics of Low-Energy Ligand-Field Excited States: A CuCl42– Complex

2017 ◽  
Vol 121 (17) ◽  
pp. 4562-4568 ◽  
Author(s):  
Andrey S. Mereshchenko ◽  
Olesya S. Myasnikova ◽  
Maxim S. Panov ◽  
Vladimir A. Kochemirovsky ◽  
Mikhail Yu. Skripkin ◽  
...  
Keyword(s):  
Excited States ◽  
Solvent Effects ◽  
Low Energy ◽  
Ligand Field ◽  
Relaxation Dynamics ◽  
Nonradiative Relaxation

scholarly journals Mechanisms of vortices termination in the cardiac muscle

2017 ◽  
Vol 4 (3) ◽  
pp. 170024 ◽  
Author(s):  
D. Hornung ◽  
V. N. Biktashev ◽  
N. F. Otani ◽  
T. K. Shajahan ◽  
T. Baig ◽  
...  
Keyword(s):  
Ventricular Fibrillation ◽  
Electric Field ◽  
Cardiac Muscle ◽  
Success Rate ◽  
Direct Observation ◽  
Time Windows ◽  
Critical Time ◽  
Low Energy ◽  
Isolated Hearts ◽  
Standing Problem

We propose a solution to a long-standing problem: how to terminate multiple vortices in the heart, when the locations of their cores and their critical time windows are unknown. We scan the phases of all pinned vortices in parallel with electric field pulses (E-pulses). We specify a condition on pacing parameters that guarantees termination of one vortex. For more than one vortex with significantly different frequencies, the success of scanning depends on chance, and all vortices are terminated with a success rate of less than one. We found that a similar mechanism terminates also a free (not pinned) vortex. A series of about 500 experiments with termination of ventricular fibrillation by E-pulses in pig isolated hearts is evidence that pinned vortices, hidden from direct observation, are significant in fibrillation. These results form a physical basis needed for the creation of new effective low energy defibrillation methods based on the termination of vortices underlying fibrillation.

scholarly journals Electric field measurements on Cluster: comparing the double-probe and electron drift techniques

2006 ◽  
Vol 24 (1) ◽  
pp. 275-289 ◽  
Author(s):  
A. I. Eriksson ◽  
M. André ◽  
B. Klecker ◽  
H. Laakso ◽  
P.-A. Lindqvist ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Cold Plasma ◽  
Field Measurements ◽  
Low Energy ◽  
Electron Drift ◽  
Double Probe ◽  
Flow Energy ◽  
Potential Control ◽  
Spacecraft Potential

Abstract. The four Cluster satellites each carry two instruments designed for measuring the electric field: a double-probe instrument (EFW) and an electron drift instrument (EDI). We compare data from the two instruments in a representative sample of plasma regions. The complementary merits and weaknesses of the two techniques are illustrated. EDI operations are confined to regions of magnetic fields above 30 nT and where wave activity and keV electron fluxes are not too high, while EFW can provide data everywhere, and can go far higher in sampling frequency than EDI. On the other hand, the EDI technique is immune to variations in the low energy plasma, while EFW sometimes detects significant nongeophysical electric fields, particularly in regions with drifting plasma, with ion energy (in eV) below the spacecraft potential (in volts). We show that the polar cap is a particularly intricate region for the double-probe technique, where large nongeophysical fields regularly contaminate EFW measurments of the DC electric field. We present a model explaining this in terms of enhanced cold plasma wake effects appearing when the ion flow energy is higher than the thermal energy but below the spacecraft potential multiplied by the ion charge. We suggest that these conditions, which are typical of the polar wind and occur sporadically in other regions containing a significant low energy ion population, cause a large cold plasma wake behind the spacecraft, resulting in spurious electric fields in EFW data. This interpretation is supported by an analysis of the direction of the spurious electric field, and by showing that use of active potential control alleviates the situation.

Sign in / Sign up

Export Citation Format

Share Document