Boron and Nitrogen Hyperfine Structure in the Microwave Spectrum of Trimethylamine-Borane

1985 ◽  
Vol 40 (12) ◽  
pp. 1262-1264 ◽  
Author(s):  
W. Kasten ◽  
H. Dreizler ◽  
R.L. Kuczkowki
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Bond Order ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
A Value ◽  
Isotopic Species ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants

We investigated the microwave spectrum of trimethylamine-borane by microwave Fourier transform spectroscopy and determined the quadrupole coupling constants of 11B and 14N and the rotational and centrifugal distortion constants for the 11B isotopic species. The B-N bond order is discussed and a value for e Qq210(14N) is determined.

scholarly journals Boron Hyperfine Structure in Trifluorophosphine-Borane

1985 ◽  
Vol 40 (9) ◽  
pp. 920-922
Author(s):  
W. Kasten ◽  
H. Dreizler ◽  
R. L. Kuczkowski
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Bond Order ◽  
Fourier Transform Spectroscopy ◽  
Microwave Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants

Abstract We reinvestigated the microwave spectrum of trifluorophosphine-borane by microwave Fourier transform spectroscopy and determined the quadrupole coupling and centrifugal distortion constants for both isotopes 10B and 11B. The B-P bond order is discussed.

33S Nuclear Hyperfine Structure in the Rotational Spectrum of Thiazole

1993 ◽  
Vol 48 (12) ◽  
pp. 1219-1222 ◽  
Author(s):  
U. Kretschmer ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Microwave Spectroscopy ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

Abstract We investigated the 33S nuclear quadrupole coupling of thiazole- 33S in natural abundance by molecular beam Fourier transform microwave spectroscopy. In addition the 14N nuclear quadrupole coupling could be analyzed with high precision. We derived the rotational constants A = 8529.29268 (70) MHz, B = 5427.47098 MHz, and C = 3315.21676 (26) MHz, quartic centrifugal distortion constants and the quadrupole coupling constants of 33S χaa = 7.1708 (61) MHz and χbb= -26.1749 (69) MHz and of 14N χ aa = -2.7411 (61) MHz and χbb = 0.0767 (69) MHz.

The Centimeter and Millimeter Microwave Spectrum of 1,1-Difluoro-2-Chloroethylene

1993 ◽  
Vol 48 (3) ◽  
pp. 514-518 ◽  
Author(s):  
Luis A. Leal ◽  
J. C. López ◽  
J. L. Alonso ◽  
A. Guarnieri
Keyword(s):  
Microwave Spectrum ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
Frequency Range ◽  
Coupling Analysis ◽  
Rotational Spectra ◽  
First Order ◽  
Isotopic Species ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants

Abstract The rotational spectra of both 35Cl and 37Cl 1,1-difluoro-2-chloroethylene isotopomers have been measured in the frequency range 12-225 GHz. A first order quadrupole coupling analysis has been performed for both isotopic species. The calculated quadrupole coupling constants for the 37Cl species not previously reported are χaa = - 49.2 (2), χbb = 14.2 (1), and χcc = 28.7 (1). Accurate rotational constants, quartic and some sextic centrifugal distortion constants have also been determined for both isotopomers from the fit to the observed central frequencies.

Mikrowellenspektrum und rotationsspektroskopische Konstanten der Methylchlorsilane: CH3SiH2Cl, CH3SiD2Cl und CD3SiD2Cl / Microwave Spectrum and Rotational Spectroscopic Constants of Methyl-chloro-silane: CH3SiH2Cl, CH3SiD2Cl and CD3SiD2Cl

1975 ◽  
Vol 30 (11) ◽  
pp. 1441-1446
Author(s):  
W. Zeil ◽  
W. Braun ◽  
B. Haas ◽  
H. Knehr ◽  
F. Rückert ◽  
...  
Keyword(s):  
Microwave Spectrum ◽  
Coupling Constants ◽  
Spectroscopic Constants ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Microwave Spectra ◽  
Isotopic Species ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

The microwave spectra of the following isotopic species of Methyl-chloro-silane: CH3SiH2Cl, CH3SiD2 and CD3SiD2Cl have been measured and the rotational spectroscopic constants (rotational constants, centrifugal distortion constants and nuclear quadrupole coupling constants) have been determined

Effects of Centrifugal Distortion and Nuclear Quadrupole Coupling in the Microwave Spectrum of Vinyl Chloride

1971 ◽  
Vol 49 (2) ◽  
pp. 255-264 ◽  
Author(s):  
M. C. L. Gerry
Keyword(s):  
Vinyl Chloride ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
First Order ◽  
Isotopic Species ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants ◽  
Infrared Data

Both a- and b-type rotational transitions have been measured up to J = 30 for the two most abundant isotopic species of vinyl chloride, in the frequency region 8–18 GHz. These have enabled refinement of the rotational and chlorine nuclear quadrupole coupling constants, and evaluation of all first order centrifugal distortion constants. From the quadrupole coupling constants it is concluded that the field gradient around the C—Cl bond is somewhat more symmetric than previously reported. A comparison is made between the centrifugal distortion constants obtained from the microwave spectrum and those calculated using infrared data.

Bromine Spin-Rotation Coupling Constants of Cyclopropylbromide-79Br and -81Br

1992 ◽  
Vol 47 (3) ◽  
pp. 507-510
Author(s):  
N. Heineking ◽  
J. Gripp ◽  
H Dreizler
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectroscopy ◽  
Microwave Spectrum ◽  
Spin Rotation ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Diagonal Component ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants

AbstractWe reinvestigated the microwave spectrum of cyclopropylbromide with the increased resolution of pulsed microwave Fourier transform spectroscopy. Because of the higher frequency precision, it was possible to determine the spin-rotation coupling constants of bromine. Global fits of rotational constants, quartic centrifugal distortion constants, quadrupole coupling constants including the off-diagonal component χac , and spin-rotation coupling constants simultaneously to almost one hundred hyperfine components for each of the two bromine isotopomers resulted in overall standard deviations of well below 5 kHz

The 33S Nuclear Hyperfine Structure in the Rotational Spectrum of Isothiazole

1994 ◽  
Vol 49 (11) ◽  
pp. 1059-1062
Author(s):  
J. Gripp ◽  
U. Kretschmer ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Microwave Spectroscopy ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

Abstract We investigated the 33S nuclear quadrupole coupling in the rotational spectrum of isothiazole in natural abundance by molecular beam Fourier transform microwave spectroscopy. In addition the 14N nuclear quadrupole coupling could be analyzed with high precision. We derived the rotational constants A = 8275.51880(80) MHz, B = 5767.06181 (40) MHz, and C = 3396.85702(36) MHz, quartic centrifugal distortion constants, and the quadrupole coupling constants χaa (33S) = 8.7015 (57) MHz, χbb(33S) = -32.9696(60) MHz, χaa(14N) = 1.0732(47) MHz and χbb(14N) = -2.4753(46) MHz.

The Microwave Spectrum and Nuclear Quadrupole Coupling Constants of HNC17O

1989 ◽  
Vol 44 (12) ◽  
pp. 1187-1190
Author(s):  
M. C. L Gerry ◽  
S. J. Howard ◽  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Ab Initio ◽  
Hyperfine Structure ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
Ab Initio Prediction ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
First Time

Abstract The microwave spectrum of HNC17O is reported for the first time. The measurements were made with both Stark modulated and microwave Fourier transform spectrometers. The 17O and 14N quadrupole hyperfine structure has been resolved and rotational, centrifugal distortion and 17O and 14N quadrupole coupling constants have been evaluated. The 17O coupling constants are compared with those from an ab initio prediction.

Investigation of the Microwave Spectrum of Cyclopropyl Isocyanate. An Example for the Failure of Centrifugal Distortion Theory

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1175-1184 ◽  
Author(s):  
C. Heldmann ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Ground State ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational Ground State ◽  
Quadrupole Coupling

Abstract The vibrational ground state microwave spectrum of cyclopropyl isocyanate was investigated in the region from 8.4 to 40 GHz by microwave Fourier transform (MWFT) spectroscopy. The quadru-pole hyperfine structure was resolved and assigned. The quadrupole coupling constants are given. With respect to the data given in the literature up to now, this work led to a more profound description of the pure rotational spectrum. Furthermore, some interesting and surprising results concerning the effect of centrifugal distortion are presented. Compared to hitherto existing investi-gations, these results indicate a more complicated conformational behaviour of cyclopropyl iso-cyanate.

14N Nuclear Quadrupole Hyperfine Structure in the Rotational Spectrum of Thionyl Aniline

1991 ◽  
Vol 46 (11) ◽  
pp. 989-992 ◽  
Author(s):  
N. Heineking ◽  
J.-U. Grabow ◽  
K. Vormann ◽  
W. Stahl
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants ◽  
Hyperfine Structures

AbstractNuclear quadrupole hyperfine structures have been resolved in the rotational spectrum of thionyl aniline, C6H5NSO, using pulsed molecular beam microwave Fourier transform spectroscopy. High precision nuclear quadrupole coupling constants, rotational and quartic centrifugal distortion constants have been determined from the analysis of 12 low-J transitions. Coupling constants are χaa = + 1.5730(14) MHz and (χbb - χcc)= -5.6499(13) MHz. rotational constants are A-4026.72i5(4) MHz, B = 860.64732(8) MHz, and C = 709.52027(7) MHz, and centrifugal distortion constants are ΔJ - 36.6(5) Hz, ΔJK= -107.5(20) Hz, ΔK = 703(68) Hz, δJ = 8.1(5) Hz, and δK=111(19) Hz (representation I' used).

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