| 21. |
- Zhaunerchyk, Vitali, et al.
(författare)
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Investigation into the vibrational yield of OH products in the OH plus H plus H channel arising from the dissociative recombination of H3O
- 2009
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 130:21, s. 214302-
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Tidskriftsartikel (refereegranskat)abstract
- The vibrational population of the hydroxyl radical, OH, formed in the OH+H+H channel arising from the dissociative recombination of the hydronium ion, H3O+, has been investigated at the storage ring CRYRING using a position-sensitive imaging detector. Analysis shows that the OH fragments are predominantly produced in the v=0 and v=1 states with almost equal probabilities. This observation is in disagreement with earlier FALP experiments, which reported OH(v=0) as the dominant product. Possible explanations for this difference are discussed.
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| 22. |
- Zhaunerchyk, Vitali, et al.
(författare)
-
Sequential formation of the CH3+H+H channel in the dissociative recombination of CH5
- 2009
-
Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 79:3, s. 30701-
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Tidskriftsartikel (refereegranskat)abstract
- The fragmentation dynamics in the CH3+H+H channel arising from the dissociative recombination of protonated methane, CH5+, has been investigated with an imaging detector at the CRYRING storage ring. The experimental results imply that this channel proceeds via two-step break-up in which the intermediate CH4 molecule is sufficiently internally excited to further fragment. These observations could go some way to explaining the discrepancy in results reported from ion storage rings and FALP apparatus.
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| 23. |
- Kwiatkowski, A., et al.
(författare)
-
Magnetic properties of MnAs nanocrystals embedded in GaAs
- 2009
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853. ; 321:18, s. 2788-2791
-
Tidskriftsartikel (refereegranskat)abstract
- A phenomenological model for explaining the magnetic properties of MnAs nanocrystals embedded in GaAs is proposed. It is shown that experimental data of DC magnetization as a function of temperature, obtained according to zero-field-cooled and field-cooled protocols, can be understood assuming a transition of the system from a low temperature state in which very slow dynamics is observed(frozen state) to a high-temperature state in which dynamics is fast(quasi superparamagnetic state). (C) 2009 Elsevier B. V. All rights reserved.
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| 24. |
- Kwiatkowski, A., et al.
(författare)
-
MnAs Nanocrystals Embedded in GaAs
- 2008
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Ingår i: ACTA PHYSICA POLONICA A. - 0587-4246. ; 114:5, s. 1207-1211
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Konferensbidrag (refereegranskat)abstract
- Magnetic properties of MnAs nanocrystals embedded in GaAs are analyzed in the frame of phenomenological model proposed by Sasaki for ferritin superparamagnets. Our calculations explain qualitatively experimental data of magnetization versus temperature; obtained according to zero-field-cooled and field-cooled protocols. They show dynamics of magnetization of MnAs nanocrystals in range of temperature from 10 K to 320 K. There is transition from state in which very slow dynamics is observed (frozen state) to state in which dynamics is fast (quasi-superparamagnetic state).
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| 25. |
- Kwiatkowski, A., et al.
(författare)
-
Structure and magnetism of MnAs nanocrystals embedded in GaAs as a function of post-growth annealing temperature
- 2007
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Ingår i: Applied Physics Reviews. - : AIP Publishing. - 1931-9401. ; 101:11
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Tidskriftsartikel (refereegranskat)abstract
- Self-organized Ga(Mn)As nanoclusters, embedded in GaAs, were formed during post-growth thermal annealing of Ga1-xMnxAs layers. Structural and magnetic properties of such composites were systematically studied as a function of the annealing temperature. Small (similar to 3 nm) Mn-rich zinc-blende Mn(Ga)As clusters, coherent with the GaAs matrix, were formed at the annealing temperature of 500 degrees C. An increase of the annealing temperature of up to 600 degrees C led to the creation of 10-20 nm large NiAs-type hexagonal MnAs nanocrystals. Magnetization measurements showed that the MnAs nanoprecipitates were superparamagnetic, with a distribution of blocking temperatures that depended on the MnAs cluster size. Some intermediate paramagnetic clusters (structurally disordered clusters) were also observed. (c) 2007 American Institute of Physics.
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| 26. |
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