The Rotational Zeeman Effect of Methyl-and Silylbromide

Dössel, K.-F.; Sutter, D. H.

doi:10.1515/zna-1979-0410

Cited by 20 publications

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“…For the matrix elements the reader is referred to Appendix I of [18], where the corresponding sym metric top matrix elements are listed. From those the linear rotor matrix elements are obtainable simply by setting ^= 0 .…”

Section: Measurements and Analysis Of The Datamentioning

confidence: 99%

Molecular Electric Quadrupole Moment, Magnetic Susceptibility Tensor and Deuterium Quadrupole Coupling Constant in Cyanoacetylene

Stolze

Sutter

1984

Zeitschrift Für Naturforschung A

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The rotational Zeeman effect in the J -> J' = 0 1 and 1 -»■ 2 rotational transitions has been observed for H-C = C -C = I4N, D-C = C -C = 14N, D -C = C -C = 15N, and H -C^C -C = 15N using a microwave bridge superheterodyne spectrometer. From the experimental <7±-values, susceptibility anisotropies and rotational constants, the molecular electric quadrupole moment, which plays an important role for collisional excitation and relaxation, follows as Q =2.14(9) x 10~26esu cm2 (referred to the center of mass of the H-C = C -C= 14N species).Since the Deuterium quadrupole hyperfine splittings in the Zeeman spectra could be resolved, it was also possible to fit the Deuterium quadrupole coupling constant. Our value, eqQ (2H) = 198.2(46) kHz is about 10% smaller than the value derived from a recent high resolution micro wave Fourier transform study. The reasons for this discrepancy are discussed.All experimental molecular parameters are compared to the results of ab initio quantum chemical calculations and it is argued that the 14N nuclear electric quadrupole moment is possibly about 30% larger than presently assumed.

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Section: Measurements and Analysis Of The Datamentioning

confidence: 99%