The Microwave Spectrum of the Thiophene-Argon van der Waals Complex

1993 ◽  
Vol 48 (11) ◽  
pp. 1107-1110 ◽  
Author(s):  
U. Kretschmer ◽  
W. Stahl ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Molecular Beam ◽  
Argon Atom ◽  
Microwave Spectrum ◽  
Centrifugal Distortion ◽  
Ring Plane ◽  
Rotational Spectra ◽  
Van Der Waals Complex ◽  
Centrifugal Distortion Constants ◽  
Wave Spectrometer

Abstract The rotational spectra of the 32S-and 34S-thiophene-argon complex have been studied in the microwave region between 6 and 18 GHz using a pulsed molecular beam Fourier transform micro-wave spectrometer. The rotational and centrifugal distortion constants of the 32S-thiophene-argon complex were found to be A = 3280.38865(15) MHz, B = 1203.32018(15) MHz, C = 1123.45120(11) MHz, ΔJ = 3.3311 (33) kHz, ΔJK = 16.9015(31) kHz, ΔK = -18.302(14) kHz, δj = 0.235074(86) kHz, δK = 4.340(33) kHz. For the 34S-isotopomer A = 3231.16878(15) MHz, B = 1194.05602(58) MHz and C = 1109.53497(30) MHz with almost the same centrifugal distortion constants were obtained. The argon atom is placed 3.59 Å above the ring plane.

The Rotational Spectrum of the Fluorobenzene-Argon Van der Waals Complex

1992 ◽  
Vol 47 (5) ◽  
pp. 681-684 ◽  
Author(s):  
W. Stahl ◽  
J.-U. Grabow
Keyword(s):  
Fourier Transform ◽  
Molecular Beam ◽  
Van Der Waals ◽  
Argon Atom ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Ring Plane ◽  
Van Der Waals Complex ◽  
Centrifugal Distortion Constants

AbstractThe rotational spectrum of the fluorobenzene-argon complex has been studied in the microwave region between 7 and 18 GHz using a pulsed molecular beam microwave Fourier transform spectrometer. The rotational constants were found to be A = 1811.81369(11) MHz, B= 1105.12965(15) MHz, C = 901.84281(5) MHz, the centrifugal distortion constants are ΔJ = 2.6886(17) kHz, ΔJK = 8.3761 (52) kHz ΔJK= -8.278(5) kHz, ρJ, =0.65993(72) kHz, and ρK = 6.013(11) kHz. The argon atom is placed 3.55 Å above the ring plane

The Microwave Spectrum and Dipole Moment of Hexafluoropropanone

1991 ◽  
Vol 46 (3) ◽  
pp. 229-232 ◽  
Author(s):  
J.-U. Grabow ◽  
N. Heineking ◽  
W. Stahl
Keyword(s):  
Fourier Transform ◽  
Dipole Moment ◽  
Molecular Beam ◽  
Stark Effect ◽  
Microwave Spectrum ◽  
Fourier Transform Spectrometer ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Centrifugal Distortion Constants

AbstractWe recorded the microwave spectrum of hexafluoropropanone between 7 and 15 GHz using a pulsed molecular beam microwave Fourier transform spectrometer. The rotational constants were determined to be A = 2181.71980(14) MHz, B= 1037.22930(7) MHz, C = 934.89233(8) MHz, the quartic centrifugal distortion constants are D'J= 0.07378 (39) kHz, D'JK = 0.10002(75) kHz, D'K = -0.07269(266) kHz, δ'J = 0.00623(29) kHz and R' 6= 0.00755(12) kHz. Stark effect measurements yielded a dipole moment μ = μb= 0.3949 (18) D

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.

Microwave spectrum and molecular structure of silacyclopropenylidene c-C2H2Si

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1206-1212 ◽  
Author(s):  
Mitsuaki Izuha ◽  
Satoshi Yamamoto ◽  
Shuji Saito
Keyword(s):  
Microwave Spectrum ◽  
Frequency Region ◽  
Spectral Lines ◽  
Absorption Cell ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Rotational Spectra ◽  
Isotopic Species ◽  
Microwave Spectrometer ◽  
Centrifugal Distortion Constants

The rotational spectra of silacyclopropenylidene, c-C2H2Si, and its isotopic species (C2H229Si, C2D2Si, 13C2H2Si) were observed in the frequency region of 220–400 GHz by using a source-modulated microwave spectrometer combined with a free space absorption cell. c-C2H2Si was produced in the cell by discharging a mixture of SiH4, C2H2, and He. Least-squares analyses of the observed spectral lines yielded the rotational constants and the centrifugal distortion constants for the normal and its isotopic species. From the observed rotational constants, the rs structure was determined: rs (C=C) = 1.3458 Å, rs (C—Si) = 1.8200 Å rs (C—H) = 1.0795 Å, and [Formula: see text]. (1 Å = 10−10 m.)

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 Rotational Spectra of the 32S-, 33S-, and 34S-Isotopomers of Thiophene

1993 ◽  
Vol 48 (5-6) ◽  
pp. 733-736
Author(s):  
U. Kretschmer ◽  
W. Stahl ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Spectroscopy ◽  
Coupling Constants ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants

The rotational spectra of the 32S-, 34S- and 33S-isotopomers of thiophene have been studied in their natural abundances using microwave Fourier transform spectroscopy. For the 32S-isotopomer the rotational and centrifugal distortion constants were found to be A' = 8041.59407(46) MHz, B' = 5418.26219(17) MHz, C' = 3235.78061(16) MHz, D'J = 0.6967(96) kHz, D'JK = 0.530(14) kHz, D'K = 1.789(49) kHz, δ'K = 0.3067(21) kHz, R'6 = - 0.0738(12) kHz. For the 34S-isotopomer A' = 8041.7055(84) MHz, B'= 5274.1837(23) MHz, C' = 3183.8432(23) MHz, and for the 33S-isotopomer A'= 8041.651 (10) MHz, B' = 5344.2988(15) MHz, C' = 3209.25777(66) MHz with almost the same centrifugal distortion constants were obtained. The 33S-quadrupole coupling constants of the 33S-thiophene are χaa = 6.8610(64) MHz and χbb - χcc = -48.766(11) MHz.

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.

scholarly journals The Microwave Q-branch Spectrum of Germane in the Vibrational Ground State

1986 ◽  
Vol 41 (5) ◽  
pp. 747-751 ◽  
Author(s):  
W. Stahl ◽  
H. Dreizler ◽  
L. Jörissen ◽  
W. A. Kreiner
Keyword(s):  
Fourier Transform ◽  
Ground State ◽  
Spin Rotation ◽  
Subsequent Paper ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Vibrational Ground State ◽  
Spin Interactions ◽  
Centrifugal Distortion Constants

We present an analysis of the rotational spectra of 70GeH4, 72GeH4 and 74GeH4 in the vibrational ground state measured by microwave Fourier transform (MWFT) spectroscopy. All quartic, sextic and octic tensor centrifugal distortion constants have been determined. A discussion of spin-rotation and spin-spin interactions will be given in a subsequent paper.

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