Search results

1

Nuclear Quadrupole Coupling Tensor of Ch_{2}Cl_{2}: Comparison of Quadrupolar and Structural Angles in Methylene Halides

100%

Kisiel Z., Kosarzewski J., Pszczółkowski L.

Acta Physica Polonica A

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1997

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vol. 92

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issue 3

507-516

EN

Nuclear quadrupole hyperfine structure in 2_{1,2} ← 3_{0,3} and 1_{1,1} ← 2_{0,2} rotational transitions of CH_{2}^{35}Cl_{2} at 9.2 and 15.9 GHz, respectively, was measured with a newly constructed pulsed supersonic beam, cavity Fourier transform microwave spectrometer. All components of nuclear quadrupole splitting tensors of the chlorine nuclei in inertial and in principal quadrupole axes were determined. It is shown that in methylene halide molecules nuclear quadrupole information leads to a value for ∠(XCX) which is systematically larger than ∠(XCX) defined by the positions of the nuclei. Some novel features of the spectrometer are also described.

2

Delocalization of the Cu^{2+} Unpaired Electron on the Next Nearest Ligands in Sr_2Pd_{0.99}Cu_{0.01}O_3 Ceramics

100%

Augustyniak-Jabłokow M., Yablokov Y., Jacyna-Onyszkiewicz I., Ivanova T., Shustov V., Polovniak V.

Acta Physica Polonica A

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2008

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vol. 114

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issue 1

197-201

EN

Supertransferred hyperfine interactions between the Cu^{2+} unpaired electron and the ^{105}Pd nuclei in the Sr_2Pd_{0.99}Cu_{0.01}O_3 ceramic were studied by the EPR method. The spectrum of isolated -Pd-O-CuO_2-O-Pd- units (g_∥ = 2.280±0.001; g_⊥ = 2.040±0.001; A_∥(^{63}Cu) = 13 mT±0.1; A_∥(^{65}Cu) = 13.9 ±0.1 mT; A_⊥(^{63,65}Cu) = 0.0 mT) overlaps the signal from small groups of exchange coupled Cu^{2+} ions (g_∥ = 2.278±0.002; g_⊥ = 2.041±0.001). The isotropic contribution was shown to dominate in the Cu-Pd supertransferred interactions (A_∥(^{105}Pd) = A_⊥ (^{105}Pd) = 1 mT = a_{iso} Pd).

3

Rotational Spectrum of the Most Abundant Isotopomers of the Van der Waals Dimer N_2···HBr

88%

Kisiel Z., Pietrewicz B., Pszczółkowski L.

Acta Physica Polonica A

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2002

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vol. 101

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issue 2

231-242

EN

The rotational spectrum of the two most abundant isotopomers of the weakly bound dimer between dinitrogen and hydrogen bromide, ^{14}N_2···H^{79}Br and ^{14}N_2···H^{81}Br, has been measured for the first time. The three lowest J transitions, at frequencies from 2 to 8 GHz, have been studied at conditions of supersonic expansion. The complicated hyperfine splitting structure arising from the three non-equivalent quadrupolar nuclei has been assigned and fitted. The resulting spectroscopic constants and the derived molecular quantities are compared with those for other isotopomers, as well as with experimental and calculated results for other linear dimers involving dinitrogen. A revised value for the nuclear quadrupole splitting constant for free nitrogen molecule,ρ(N)=-5.3(1) MHz, is also derived.

4

Observation and Properties of the van der Waals Dimer Ar· ··HCCCN Produced in Electrical Discharge

88%

Desyatnyk O., Kosarzewski J., Kisiel Z.

Acta Physica Polonica A

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2003

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vol. 104

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issue 5

415-424

EN

The weakly bound van der Waals dimer between a molecule of cyanoacetylene and an argon atom was observed by rotational spectroscopy of supersonic expansion. Cyanoacetylene was generated in situ from vinyl cyanide precursor by means of a high voltage discharge just downstream of the expansion nozzle. Both ^bR- and ^bQ-type rotational transitions were measured and rotational, centrifugal distortion, and nuclear quadrupole splitting constants were determined. Analysis of the data shows that ground state geometry of the dimer is characterised by R_{cm}=3.65Å andθ=94.9º, with the Ar atom shifted from the position above the cyanoacetylene centre of mass in the direction of the CN group.

5

EPR Study of Gamma Irradiated Cholestanone Single Crystal

51%

Caliskan B.

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vol. 125

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issue 1

135-138

EN

Cholestanone (C_{27}H_{46}O) single crystals were irradiated with ^{60}Co-γ rays at room temperature. The spectra were recorded for different orientations of the crystal in the magnetic field at 120 K using the EPR technique. Radiation damage center was attributed to ĊHCH_2 CH_2 radical. The principal values of the hyperfine coupling tensor of the unpaired electron with the protons and the principal values of the g tensor were determined. The results were found to be in good agreement with the existing literature.

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5 Acta Physica Polonica A

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3 Kisiel Z.

2 Kosarzewski J.

2 Pszczółkowski L.

1 Augustyniak-Jabłokow M.

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1 Ivanova T.

1 Jacyna-Onyszkiewicz I.

1 Pietrewicz B.

1 Polovniak V.

1 Shustov V.

1 Yablokov Y.

Nuclear Quadrupole Coupling Tensor of Ch_{2}Cl_{2}: Comparison of Quadrupolar and Structural Angles in Methylene Halides

Delocalization of the Cu^{2+} Unpaired Electron on the Next Nearest Ligands in Sr_2Pd_{0.99}Cu_{0.01}O_3 Ceramics

Rotational Spectrum of the Most Abundant Isotopomers of the Van der Waals Dimer N_2···HBr

Observation and Properties of the van der Waals Dimer Ar· ··HCCCN Produced in Electrical Discharge

EPR Study of Gamma Irradiated Cholestanone Single Crystal