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

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Kisiel Z., Pietrewicz B., Pszczółkowski L.

Acta Physica Polonica A

2002

vol. 101

issue 2

231-242

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.

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

1997

vol. 92

issue 3

507-516

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.

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2 Acta Physica Polonica A

1 2002

1 1997

2 Kisiel Z.

2 Pszczółkowski L.

1 Kosarzewski J.

1 Pietrewicz B.

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

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