371 resultados para MN2
Resumo:
Time-resolved Kerr rotation measurement in the (Ga,Mn)As diluted magnetic semiconductor allows direct observation of the dynamical properties of the spin system of the magnetic ions and the spin-polarized holes. Experimental results show that the magnetic ions can be aligned by the polarized holes, and the time scales of spin alignment and relaxation take place in tens and hundreds of picoseconds, respectively. The Larmor frequency and effective g factor obtained in the Voigt geometry show an unusual temperature dependence in the vicinity of the Curie temperature due to the exchange coupling between the photoexcited holes and magnetic ions. Such a spin coherent precession can be amplified or destructed by two sequential excitation pulses with circularly copolarized or oppositely polarized helicity, respectively. (c) 2006 American Institute of Physics.
Resumo:
Magnetophotoluminescence properties of Zn0.88Mn0.12Se thin films grown by metal-organic chemical vapor deposition on GaAs substrates are investigated in fields up to 10 T. The linewidth of the excitonic luminescence peaks decreases with the increasing magnetic field (< 1 T), but the peak energy is almost unchanged. There is a crossover of the photoluminescence intensities between interband and bound excitonic transitions as the magnetic field is increased to about 1 T. These behaviors are interpreted by the strong tuning of the local alloy disorder potential by the applied magnetic field. In addition, the magnetic field-induced suppression of the energy transfers from excitons to Mn2+ ions is also observed.
Resumo:
Manganese-gallium oxide nanowires were synthesized via in situ Mn doping during nanowire growth using a vapor phase evaporation method. The microstructure and composition of the products were characterized via transmission electron microscopy (TEM), field emission scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy. The field and temperature dependence of the magnetization reveal the obvious hysteresis loop and large magnitude of Curie-Weiss temperature. The photoluminescence of the manganese-gallium oxide nanowires were studied in a temperature range between 10 and 300 K. A broad green emission band was observed which is attributed to the T-4(1)-(6)A(1) transition in Mn2+ (3d(5)) ions. (c) 2005 Elsevier B.V. All rights reserved.
Resumo:
The temperature dependences of the orange and blue emissions in 10, 4.5, and 3 nm ZnS:Mn nanoparticles were investigated. The orange emission is from the T-4(1)-(6)A(1) transition of Mn2+ ions and the blue emission is related to the donor-acceptor recombination in the ZnS host. With increasing temperature, the blue emission has a red-shift. On the other hand, the peak energy of the orange emission is only weakly dependent on temperature. The luminescence intensity of the orange emission decreases rapidly from 110 to 300 K for the 10 nm sample but increases obviously for the 3 nm sample, whereas the emission intensity is nearly, independent of temperature for the 4.5 nm sample. A thermally activated carrier-transfer model has been proposed to explain the observed abnormal temperature behaviour of the orange emission in ZnS:Mn nanoparticles.
Resumo:
(magnetic resonance imaging, MRI)MRI30%~40% (1) MRI Gd-DTPA(Gd-DTPA-CMAG-An)Gd-DTPA(Gd-DTPA-CMDn-Cyst)Gd-DTPA-CMAG-AnGd-DTPA-CMAG-AnGd-DTPA1.4Gd-DTPA-CMAG-A2Gd-DTPA2.0Gd-DTPA-CMAG-A2MRIGd-DTPA-CMDn-CystGd-DTPA-CMD4-CystGd-DTPA-CMD4-Cyst (2) MnNaY MRI Mn2+NaYMnNaYMnNaYGd-DTPAMn2+NaY(3.2%~5.2%)MnNaY (3.2% Mn) (3) MRI GL-(A-Gd-DTPA)3Gd-DTPA1.4()GLGAGd-DTPA GL (4) Gd-DTPA Gd-DTPAGd-DTPA-BBAGd-DTPA-BtBAGd-DTPA
Resumo:
Eu2+ab-Zn3(PO4)2:Mn2+-Zn3PO42:Mn2+Zn3B2O6:Mn2+Y2O3Eu3+Ca8MgSiO44Cl2:Eu2+Zn4B6O13:Mn2+-Zn3(PO4)2Mn2+Zn2SiO4:Mn2+Y2O2S:Eu3+caOEu3-Zn3(PO4)2:Mn2+Ga3+Zn2SiO4:Mn2+Al3+
Resumo:
Eu~3Sm~3Mn~2Fe~3Co~2Ni~2ZnOcccc10Onm15357-366nmEu3+Sm3Mn2+Fe3Co2Ni2Zn2+O2- Eu3+ZnO363nm368nmEg=3.423.40evEu3Zn1-xEux0.005x0.15Zn1-xTMxO356nm-369nm3.34-3.46eVCo2d-dZn1-xCoxO60Zn1-xEuxO90Zn1-xEuxO613nmEu37F5D378nmZnO394nmEu3+5D07FJJ1234zno378nmEu3+5D07F2znoE4-400KZn0.9Eu0.1OznogCooIO23oK200KM-HBr021emgHc327OeZn0.9Mn0.1OZn0.9Ni0.1OZn0.9Co0.1O80KZn0.9Eu0.1OZT110K14.53Zn1-xTMxOCoFeNiMnZn1-xTMxO80Co2DMSsol-gelZnoTMMCM-41AAOZnO:TMMCM-41MCM-41AAoloonmMCM-41Zn0.9Co0.1O80K-30OKMnFeNiZnoAAOZnO:TM(TM=MnFeCoNiSOK-30OKZnO:AABuSmcoZnlxCoxOPH5ZnORERE=EuSmZn0.98Co0.02O80KZnOREREEuSm80K
Resumo:
ZnS:Mn.,Mn2+4T1-6A1.10,4.5,3.5,3 nmZnS:MnMn2+-29.40.3-30.10.3,-33.30.6,-34.60.8,-391 meV/GPa,,DqRacahB.1nmMn2+,,Y.
Resumo:
/PncAPncA22.4 KDapH6.6 ~ 7.435 ~ 45 CPncAMn2+Fe2+1:1PncAPncA9PncA9D8K96C138PncAD49H51H57H71Y103S104Pyrococcus horikoshii PncA, , 19pncAPncA78.9 %16
Resumo:
1758-3600m 6175826203200350035873600m22540185225 1.2251028452251010928 1604511745B1394873U/ml16SrDNAB1394Bacillus subtilis60pH 8.0 405060 Mn2+ Mg2+ Ca2+Hg2+ Fe3+ Cu2+ Zn2+ Fe2+PMSF 2.10040 Rhizoctonia solaniCandida albicans373537%35%1845%SHA6Fusarium oxysporum10SHA6, SHA6Aurantimonas altamirensis 3.205SHA4100g/ml83%,400ppm48h38%SHA4Nocardiopsis sp
Resumo:
(CMC):(AA)/=10,()(N,N-)0.00140.0015.,CMC400~45016h,Zn2+Cu2+Pb2+Cd2+Cr2+Ni2+Mn2+.,CMC,pH,pH9;CMCPb2+Cu2+.
Resumo:
Synthetic procedures for new mixed-donor macrocycle compounds were reported. The macrocyclic compounds were used in solvent extraction metal picrates such as Ag+, Hg2+, Cd2+, Zn2+, Cu2+, Ni2+, Mn2+, Pb2+, and Co2+. The metal picrate extractions were investigated at 250.1C with the aid of UV-visible spectrometry. It was found that 6,7,9,10,12,13,23,24-octahydro-19H,26Hdibenzo[h,t](1,4,7,13,16,22,10,19) dioxatetrathiadiazasiclotetracosine-20,27(21H,28H)-dione showed selectivity towards Ag+, Hg2+, and Cd2+ among the other metals. The extraction constants (Log Kex) and complex compositions were determined for the Ag+ and Hg2+ complexes for this compound and 9,10,12,13,23,24,26,27,29,30-decahydro-5H,15H-dibenzo-[h,w][1,4,7,13,16,19,25-,10,22] dioxapentathiadiazacycloheptacosine-6,16(7H,17H)-dione.
Resumo:
3 200~3 600 m185,1B1394,873 U/mL16S rDNA,(Bacillus subtilis):60,pH 8.0,3040,40~60,;Mn2+Mg2+Ca2+,Hg2+Fe3+Cu2+Zn2+Fe2+;PMSF,
Resumo:
Mn2+Manganese-enhanced magnetic resonanceimagingMEMRI4.7TEEG MEMRIMn2+Ca2+Ca2+Ca2+Mg2+ (MILDVAN and COHN, 1963; EISINGER et al., 1965)Mn2+MEMRIMn2+Mn2+Mn2+80mMol/L200nlGlu 0.5mM/L-aminobutyric acidGABA 0.5M/LMn2+Mn2+ 358n=510Mn2+Mn2++Glu/Mn2+Mn2+20p=0.016, student t-test, *p <0.05Mn2++GABAp=0.047, *p<0.05Mn2+Ca2+Mn2+Mn2+Mn2+Mn2+ 5Mn2+3p0.0558p=0.004*p<0.052432Mn2+80mM/L,200nl510%(10mg/kg, 12)MEMRI16Mn2+( one-way ANOVA, Post Hoc Dunnetts C Tests), F (6,28)=7.242, P<0.001)357Mn2+(one-way ANOVA, *p<0.05)EEGgammaEEG(Two-way ANOVA, F(1,10)=13.626,p=0.006)1gammaEEG35gammaEEGMEMRI
Resumo:
Different effects of divalent metal ions on electrochemiluminescence (ECL) sensor with Ru(bPY)(3)(2+) immobilized in Eastman-AQ membrane were investigated. Mg2+,Ca2+ and Fe2+ can elevate the ECL of Ru(bpY)(3)(2+)/proline; while metal ions that underwent redox reactions on the electrode such as Mn2+ and Co2+ presented intensive quenching effects on Ru(bpy)(3)(2+) ECL. Also, the quenching effect of Mn2+ on the ECL sensor with Ru(bpY)(3)(2+) immobilized in Eastman-AQ membrane enhanced to about 30-folds compared with the case that Ru(bpy)(3)(2+) was dissolved in phosphate buffer, and the enhanced quenching effects of Mn2+ were studied.
