scholarly journals EPR study of NO radicals encased in modified open C<sub>60</sub> fullerenes

2020 ◽  
Vol 1 (2) ◽  
pp. 197-207
Author(s):  
Klaus-Peter Dinse ◽  
Tatsuhisa Kato ◽  
Shota Hasegawa ◽  
Yoshifumi Hashikawa ◽  
Yasujiro Murata ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Relaxation Times ◽  
Three Dimensional ◽  
Activation Temperature ◽  
Paramagnetic Resonance ◽  
Yield Information ◽  
G Value ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Partial Compensation

Abstract. Using pulsed electron paramagnetic resonance (EPR) techniques, the low-temperature magnetic properties of the NO radical being confined in two different modified open C60-derived cages are determined. It is found that the smallest principal g value g3, being assigned to the axis of the radical, deviates strongly from the free electron value. This behaviour results from partial compensation of the spin and orbital contributions to the g3 value. The measured g3 values in the range of 0.7 yield information about the deviation of the locking potential for the encaged NO from axial symmetry. The estimated 17 meV asymmetry is quite small compared to the situation found for the same radical in polycrystalline or amorphous matrices ranging from 300 to 500 meV. The analysis of the temperature dependence of spin relaxation times resulted in an activation temperature of about 3 K, assigned to temperature-activated motion of the NO within the modified open C60-derived cages with coupled rotational and translational degrees of freedom in a complicated three-dimensional locking potential.

scholarly journals EPR Study of NO radicals encased in modified open C60 Fullerenes

2020 ◽  
Author(s):  
Klaus-Peter Dinse ◽  
Tatsuhisa Kato ◽  
Shota Hasegawa ◽  
Yoshifumi Hashikawa ◽  
Yasujiro Murata ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Critical Temperature ◽  
Low Temperature ◽  
Degrees Of Freedom ◽  
Relaxation Times ◽  
3 Dimensional ◽  
Pulsed Epr ◽  
G Value ◽  
Partial Compensation ◽  
C60 Fullerenes

Abstract. Using pulsed EPR techniques, the low temperature magnetic properties of the NO radical being confined in a C60 derived cage are determined. It is found that the smallest principal g value g3, being assigned to the axis of the radical, deviates strongly from the free electron value. This behavior results from partial compensation of the spin and orbital contributions to the g3 value. The measured value g3 = 0.77(5) yields information about the deviation of the locking potential from axial symmetry. This 17 meV asymmetry is found to be quite small compared to the situation found for the same radical in polycrystalline or amorphous matrices ranging from 300 to 500 meV. The analysis of the temperature dependence of spin relaxation times resulted in a critical temperature of about 3.5 K, assigned to temperature activated motion of the radical with coupled rotational and translational degrees of freedom in the complicated 3-dimensional potential.

Temperature Dependent Line-Shape of the Silicon Dangling Bond EPR-Resonance in Polycrystalline Silicon

1996 ◽  
Vol 452 ◽  
Author(s):  
N. H. Nickel ◽  
E. A. Schiff
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Polycrystalline Silicon ◽  
Room Temperature ◽  
Dangling Bond ◽  
Temperature Dependent ◽  
Paramagnetic Resonance ◽  
Temperature Electron ◽  
Motional Narrowing ◽  
G Value ◽  
Electron Paramagnetic

AbstractThe temperature dependence of the silicon dangling-bond resonance in polycrystalline (poly-Si) and amorphous silicon (a-Si:H) was measured. At room temperature, electron paramagnetic resonance (EPR) measurements reveal an isotropie g-value of 2.0055 and a line width of 6.5 and 6.1 G for Si dangling-bonds in a-Si:H and poly-Si, respectively. In both materials spin density and g-value are independent of temperature. While in a-Si:H the width of the resonance did not change with temperature, poly-Si exhibits a remarkable T dependence of ΔHpp. In unpassivated poly-Si a pronounced decrease of ΔHpp is observed for temperatures above 300 K. At 384 K ΔHpp reaches a minimum of 5.1 G, then increases to 6.1 G at 460 K, and eventually decreases to 4.6 G at 530 K. In hydrogenated poly-Si ΔHpp decreases monotonically above 425 K. The decrease of ΔHpp is attributed to electron hopping causing motional narrowing. An average hopping distance of 15 and 17.5 Å was estimated for unhydrogenated and H passivated poly-Si, respectively.

scholarly journals Coherent manipulation and quantum phase interference in a fullerene-based electron triplet molecular qutrit

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Ye-Xin Wang ◽  
Zheng Liu ◽  
Yu-Hui Fang ◽  
Shen Zhou ◽  
Shang-Da Jiang ◽  
...  
Keyword(s):  
Quantum Information Processing ◽  
Quantum Phase ◽  
Information Storage ◽  
Paramagnetic Resonance ◽  
Molecular Electron ◽  
Phase Interference ◽  
Superposition States ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Coherent Manipulation

AbstractHigh-spin magnetic molecules are promising candidates for quantum information processing because their intrinsic multiplicity facilitates information storage and computational operations. However, due to the absence of suitable sublevel splittings, their susceptibility to environmental disturbances and limitation from the selection rule, the arbitrary control of the quantum state of a molecular electron multiplet has not been realized. Here, we exploit the photoexcited triplet of C70 as a molecular electron spin qutrit with pulsed electron paramagnetic resonance. We prepared the system into 3-level superposition states characteristic of a qutrit and validated them by the tomography of their density matrices. To further elucidate the coherence of the operation and the nature of the system as a qutrit, we demonstrated the quantum phase interference in the superposition. The interference pattern is further interpreted as a map of possible evolution paths in the space of phase factors, representing the quantum nature of the 3-level system.

scholarly journals Probing the Hydrogen Bonding of the Ferrous–NO Heme Center of nNOS by Pulsed Electron Paramagnetic Resonance

2015 ◽  
Vol 119 (25) ◽  
pp. 6641-6649 ◽  
Author(s):  
Andrei V. Astashkin ◽  
Li Chen ◽  
Bradley O. Elmore ◽  
Deepak Kunwar ◽  
Yubin Miao ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hydrogen Bonding ◽  
Paramagnetic Resonance ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic

scholarly journals Tuning Properties of Partially Reduced Graphene Oxide Fibers upon Calcium Doping

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 957 ◽  
Author(s):  
Krzysztof Tadyszak ◽  
Jacek K. Wychowaniec ◽  
Karol Załęski ◽  
Emerson Coy ◽  
Łukasz Majchrzycki ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Chemical Properties ◽  
Fiber Axis ◽  
Paramagnetic Resonance ◽  
Physico Chemical ◽  
Reduced Graphene ◽  
Calcium Doping ◽  
Bulk Structures ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic

The arrangement of two-dimensional graphene oxide sheets has been shown to influence physico-chemical properties of the final bulk structures. In particular, various graphene oxide microfibers remain of high interest in electronic applications due to their wire-like thin shapes and the ease of hydrothermal fabrication. In this research, we induced the internal ordering of graphene oxide flakes during typical hydrothermal fabrication via doping with Calcium ions (~6 wt.%) from the capillaries. The Ca2+ ions allowed for better graphene oxide flake connections formation during the hydrogelation and further modified the magnetic and electric properties of structures compared to previously studied aerogels. Moreover, we observed the unique pseudo-porous fiber structure and flakes connections perpendicular to the long fiber axis. Pulsed electron paramagnetic resonance (EPR) and conductivity measurements confirmed the denser flake ordering compared to previously studied aerogels. These studies ultimately suggest that doping graphene oxide with Ca2+ (or other) ions during hydrothermal methods could be used to better control the internal architecture and thus tune the properties of the formed structures.

250 MHz crossed-loop resonator for pulsed electron paramagnetic resonance

2002 ◽  
Vol 15 (1) ◽  
pp. 37-46 ◽  
Author(s):  
George A. Rinard ◽  
Richard W. Quine ◽  
Gareth R. Eaton ◽  
Sandra S. Eaton
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic

The Interplay of manganese and nitrate in hydroxyapatite nanoparticles as revealed by pulsed EPR and DFT

2015 ◽  
Vol 17 (31) ◽  
pp. 20331-20337 ◽  
Author(s):  
Marat Gafurov ◽  
Timur Biktagirov ◽  
Georgy Mamin ◽  
Elena Klimashina ◽  
Valery Putlayev ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Hydroxyapatite Nanoparticles ◽  
Paramagnetic Resonance ◽  
Functional Theory ◽  
Pulsed Epr ◽  
Pulsed Electron Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Oppositely Charged

The interplay of oppositely charged substitutions in the structure of hydroxyapatite nanopowders is investigated by pulsed electron paramagnetic resonance and ab initio density functional theory calculations.

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