Temat: 33.35.-q - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spatial Localized Single Quantum Heteronuclear Polarization Transfer
Autorzy:: Demco, D. E.
Ardelean, I.
Powiązania:: https://bibliotekanauki.pl/articles/1931634.pdf
Data publikacji:: 1994-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.70.Fz
33.35.-q
76.70.-r
Opis:: The existence of a strong spatial localization for the efficiency of cross-polarization by single quantum transition in the presence of a main field gradient was evidenced . The case of the solids with strong dipolar interactions has been analyzed. The slice profile of the transferred polarization was evaluated for different cross-polarization procedures. The spatial localization is superior as compared with the spin-locking slice selection method.
Źródło:: Acta Physica Polonica A; 1994, 86, 3; 407-425
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Spatial Localized Double-Quantum NMR Heteronuclear Coherence Transfer in Solids by Indirect Detection
Autorzy:: Demco, D. E.
Ardelean, I.
Powiązania:: https://bibliotekanauki.pl/articles/1945433.pdf
Data publikacji:: 1996-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 76.70.-r
76.70.Fz
33.35.-q
Opis:: The spatial localization of the double-quantum NMR heteronuclear coherence transfer in solids, in the presence of a main magnetic field gradient is analyzed. The indirect detection procedure by which the dipolar order of the abundant spin system with I=1/2 is transferred to the double-quantum coherence of the quadrupole nucleus with S=1 and back to the I-spin dipolar order is considered. The slice profile and the cross-relaxation rates are evaluated as a function of the experimental parameters and the sample relevant NMR quantities. The possibility to use this slice selective procedure for imaging and volume localized spectroscopy of quadrupole nuclei in high magnetic fields is discussed.
Źródło:: Acta Physica Polonica A; 1996, 89, 5-6; 699-714
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: EMR Data on Mn(III; S=2) Ions in MnTPPCl Complex Modelled by Microscopic Spin Hamiltonian Approach
Autorzy:: Tadyszak, K.
Rudowicz, C.
Powiązania:: https://bibliotekanauki.pl/articles/1030216.pdf
Data publikacji:: 2017-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 33.35.+r
71.70.Ch
71.70.Ej
76.20.+q
76.30.-v
76.30.Fc
87.80.Lg
Opis:: The electron magnetic resonance data on high-spin (S =2) manganese(III) 3d⁴ ion in tetraphenylporphyrinato chloride complex (MnTPPCl) obtained by high-frequency techniques are reanalysed. Preliminary results of semiempirical modeling of the spin Hamiltonian parameters for Mn(III) in MnTPPCl are presented. The microscopic spin Hamiltonian approach is utilized to predict the zero-field splitting and the Zeeman electronic parameters. It is found that for Mn(III) ions in MnTPPCl matching the experimental spin Hamiltonian parameters and the theoretical ones based on the ligand-field energy levels (Δ_{i}) within the ⁵D multiplet only may not be suitable for this system. Contributions due to the levels arising from the higher-lying ³H multiplet need to be taken into account in order to determine the reasonable values of microscopic parameters describing Mn(III) ions in MnTPPCl.
Źródło:: Acta Physica Polonica A; 2017, 132, 1; 15-19
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Comparative analysis of experimental and theoretical zero-field splitting and Zeeman electronic parameters for Fe²⁺ ions in FeX₂·4H₂O (X = F, Cl, Br, I) and [Fe(H₂O)₆](NH₄)₂(SO₄)₂
Autorzy:: Zając, M.
Rudowicz, C.
Powiązania:: https://bibliotekanauki.pl/articles/1055040.pdf
Data publikacji:: 2017-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 33.35.+r
71.70.Ch
71.70.Ej
76.20.+q
76.30.-v
76.30.Fc
87.80.Lg
Opis:: Spectroscopic and magnetic properties of Fe²⁺ (3d⁶; S=2) ions at orthorhombic sites in FeX₂·4H₂O (X = F, Cl, Br, I) crystals are compared with those in [Fe(H₂O)₆](NH₄)₂(SO₄)₂ (FASH). The microscopic spin Hamiltonian modeling utilizing the package MSH/VBA enables prediction of the zero-field splitting parameters and the Zeeman electronic ones. Wide ranges of values of the microscopic parameters, i.e. the spin-orbit (λ), spin-spin (ρ) coupling constants, and the crystal-field (ligand-field) energy levels (Δp_{i}) within the ⁵D multiplet are considered to establish the dependence of the zero-field splitting parameters b_{k}^{q} (in the Stevens notation) and the Zeeman factors g_{i} on λ, ρ, and Δp_{i}. By matching the theoretical spin Hamiltonian parameters and the experimental ones measured by EMR, the suitable values of λ, ρ, and Δp_{i} are determined. The novel aspect is prediction of the fourth-rank zero-field splitting parameters and the ρ (spin-spin)-related contributions, not considered in previous studies. The MSH predictions provide guidance for high-magnetic field and high-frequency EMR measurements.
Źródło:: Acta Physica Polonica A; 2017, 132, 1; 19-23
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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