Possibility for an intermediate-spin ground state in the charge-transfer materialSrCoO3

1995 ◽  
Vol 51 (17) ◽  
pp. 11501-11506 ◽  
Author(s):  
R. H. Potze ◽  
G. A. Sawatzky ◽  
M. Abbate
Keyword(s):  
Charge Transfer ◽  
Ground State ◽  
Intermediate Spin ◽  
Spin Ground State

scholarly journals Magnetic circular dichroism study of the selenium-substituted form (Fe3Se4) of bovine heart aconitase

1995 ◽  
Vol 311 (1) ◽  
pp. 197-202 ◽  
Author(s):  
J L Breton ◽  
J A Farrar ◽  
M C Kennedy ◽  
H Beinert ◽  
A J Thomson
Keyword(s):  
Charge Transfer ◽  
Epr Spectroscopy ◽  
Ground State ◽  
Magnetic Circular Dichroism ◽  
Bovine Heart ◽  
Transition Wavelength ◽  
Inactive Form ◽  
Mitochondrial Aconitase ◽  
Charge Transfer Transitions ◽  
Spin Ground State

The selenium-substituted inactive form of mitochondrial aconitase contains one [3Fe-4Se]1+/0 cluster [Surerus, Kennedy, Beinert and Münck (1989) Proc. Natl. Acad. Sci. U.S.A. 87, 9846-9850]. This cluster was studied in both oxidized and reduced states by magnetic CD (MCD) and EPR spectroscopy. In the MCD spectra, intensity and transition wavelength shifts are observed when compared with the spectra of the native [3Fe-4S]1+/0 cluster. These changes are used to differentiate between the charge-transfer transitions originating from inorganic and cysteinyl sulphur. Using also the data from the EPR spectra, the spin ground state is assigned as S = 1/2 for the oxidized [3Fe-4Se]1+ cluster and S = 2 for the reduced [3Fe-4Se]0 cluster.

Intermediate spin ground state of an isosceles triangular [MnII3] complex

2009 ◽  
pp. 8162 ◽  
Author(s):  
Sima Haddadpour ◽  
Heiko Niedermeyer ◽  
Rodolphe Clérac ◽  
Stefanie Dehnen
Keyword(s):  
Ground State ◽  
Intermediate Spin ◽  
Spin Ground State

A Strongly Spin-Frustrated FeIII7Complex with a Canted Intermediate Spin Ground State ofS=7/2 or 9/2

2015 ◽  
Vol 21 (30) ◽  
pp. 10835-10842 ◽  
Author(s):  
Kartik Chandra Mondal ◽  
Valeriu Mereacre ◽  
George E. Kostakis ◽  
Yanhua Lan ◽  
Christopher E. Anson ◽  
...  
Keyword(s):  
Ground State ◽  
Intermediate Spin ◽  
Spin Ground State

Evidence for Magnetic Polarons in Hole-Doped Cobalt Perovskites

2010 ◽  
Vol 1256 ◽  
Author(s):  
Andrey Podlesnyak ◽  
Albert Furrer ◽  
Thierry Straessle ◽  
Ekaterina Pomjakushina ◽  
Kazimierz Conder ◽  
...  
Keyword(s):  
Spin State ◽  
Ground State ◽  
Magnetic Impurities ◽  
Natural Analog ◽  
Magnetic Polarons ◽  
Intermediate Spin ◽  
Nonmagnetic Matrix ◽  
Very High ◽  
Ferromagnetic Particles ◽  
Spin Ground State

AbstractA substitution of La3+ by Sr2+ in LaCoO3 induces holes in the low-spin ground state of the Co ions, which behave like magnetic impurities with a very high spin value (13 μB per hole). In this work, using single-crystal neutron spectroscopy, we prove that the charges introduced by strontium doping do not remain localized at the cobalt sites. Instead, each hole not only creates Co4+ in low-spin state, but it also transforms the six nearest neighboring Co3+ ions to the intermediate-spin state thereby forming a magnetic seven-site (heptamer) polaron. Spin-state polarons behave like magnetic nanoparticles embedded in an insulating nonmagnetic matrix. Therefore, lightly doped La1-xSrxCoO3 is a natural analog to artificial structures composed of ferromagnetic particles in insulating matrices.

Fluorescence Quenching of Aminodiphenylamines with Chloromethanes

2002 ◽  
Vol 67 (8) ◽  
pp. 1154-1164 ◽  
Author(s):  
Nachiappan Radha ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Charge Transfer ◽  
Fluorescence Quenching ◽  
Ground State ◽  
Rate Constants ◽  
Quenching Mechanism ◽  
Quenching Rate ◽  
Charge Transfer Interaction ◽  
Electronically Excited ◽  
A Charge

The fluorescence quenching of 2-aminodiphenylamine (2ADPA), 4-aminodiphenylamine (4ADPA) and 4,4'-diaminodiphenylamine (DADPA) with tetrachloromethane, chloroform and dichloromethane have been studied in hexane, dioxane, acetonitrile and methanol as solvents. The quenching rate constants for the process have also been obtained by measuring the lifetimes of the fluorophores. The quenching was found to be dynamic in all cases. For 2ADPA and 4ADPA, the quenching rate constants of CCl4 and CHCl3 depend on the viscosity, whereas in the case of CH2Cl2, kq depends on polarity. The quenching rate constants for DADPA with CCl4 are viscosity-dependent but the quenching with CHCl3 and CH2Cl2 depends on the polarity of the solvents. From the results, the quenching mechanism is explained by the formation of a non-emissive complex involving a charge-transfer interaction between the electronically excited fluorophores and ground-state chloromethanes.

Charge Transfer Between CO22+ and Ar or Ne at Collision Energies 3-10 eV

2003 ◽  
Vol 68 (1) ◽  
pp. 178-188 ◽  
Author(s):  
Libor Mrázek ◽  
Ján Žabka ◽  
Zdeněk Dolejšek ◽  
Zdeněk Herman
Keyword(s):  
Charge Transfer ◽  
Excited States ◽  
Ground State ◽  
Scattering Method ◽  
Translational Energy ◽  
Centre Of Mass ◽  
Energy Distributions ◽  
Zener Model ◽  
Beam Scattering ◽  
Product Ions

The beam scattering method was used to investigate non-dissociative single-electron charge transfer between the molecular dication CO22+ and Ar or Ne at several collision energies between 3-10 eV (centre-of-mass, c.m.). Relative translational energy distributions of the product ions showed that in the reaction with Ar the CO2+ product was mainly formed in reactions of the ground state of the dication, CO22+(X3Σg-), leading to the excited states of the product CO2+(A2Πu) and CO2+(B2Σu+). In the reaction with Ne, the largest probability had the process from the reactant dication excited state CO22+(1Σg+) leading to the product ion ground state CO2+(X2Πg). Less probable were processes between the other excited states of the dication CO22+, (1∆g), (1Σu-), (3∆u), also leading to the product ion ground state CO2+(X2Πg). Using the Landau-Zener model of the reaction window, relative populations of the ground and excited states of the dication CO22+ in the reactant beam were roughly estimated as (X3Σg):(1∆g):(1Σg+):(1Σu-):(3∆u) = 1.0:0.6:0.5:0.25:0.25.

EPR Study on the complex formed by charge-transfer process between ground-state acceptor chloranil and nine donors

2010 ◽  
Vol 16 (5) ◽  
pp. 397-403
Author(s):  
Shi Ji-Liang ◽  
Zhou Cheng-Ming ◽  
Yi Hu-Nan ◽  
Qiu Zhi-Hai ◽  
Fu Yao-Hong ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transfer Process ◽  
Ground State ◽  
Charge Transfer Process
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