scholarly journals Millimeter Wave Spectrum and Centrifugal Distortion Analysis of Difluorochloromethane CHF2Cl in the Ground State

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1165-1168 ◽  
Author(s):  
R. Spiehl ◽  
A. Guarnieri
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum ◽  
Sixth Order ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Vibrational Ground State ◽  
Distortion Analysis

Abstract The rotational spectra of CHF235Cl and CHF237Cl (CFC22) in the vibrational ground state between 42 and 214 GHz are reported. A centrifugal distortion analysis up to the sixth order is carried out.

Determination of a High Potential Barrier Hindering Internal Rotation from the Ground State Spectrum. The Methylbarrier of Ethylbromide

1985 ◽  
Vol 40 (6) ◽  
pp. 575-587 ◽  
Author(s):  
J. Gripp ◽  
H. Dreizler ◽  
R. Schwarz
Keyword(s):  
Hyperfine Structure ◽  
Internal Rotation ◽  
Potential Barrier ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational Ground State ◽  
Distortion Analysis ◽  
High Potential Barrier

For ethylbromide a determination of the parameters of internal rotation is given derived from the rotational spectrum of the torsional and vibrational ground state. The Br-hyperfine structure is reanalysed with higher precision. As high J transitions were measured a centrifugal distortion analysis was necessary.

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.

Centrifugal Distortion Parameters of Fulminic Acid, HCNO, from the Millimeter-Wave Rotational Spectra

1971 ◽  
Vol 26 (1) ◽  
pp. 128-131 ◽  
Author(s):  
Manfred Winnewisser ◽  
Brenda P. Winnewisser
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Molecular Constants ◽  
Rotational Spectra ◽  
First Excited State ◽  
Bending Modes ◽  
Distortion Parameters

Abstract A newly designed millimeter-wave spectrometer has been employed for precise measurements of the millimeter-wave rotational spectrum of HCNO. Absorptions in several excited vibrational states as well as the ground state could be measured. The present paper presents the observed frequen­ cies and molecular constants obtained for the ground state and the first excited state of v4 and of v5, the vibrational bending modes

Millimeter Wave Rotational Spectrum and Centrifugal Distortion of Thioketene, H2C==C=S

1980 ◽  
Vol 35 (5) ◽  
pp. 483-489 ◽  
Author(s):  
Manfred Winnewisser ◽  
Eckhard Schäfer
Keyword(s):  
Dipole Moment ◽  
Ground State ◽  
Wavelength Region ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Millimeter Wavelength ◽  
Vibrational Ground State ◽  
Distortion Analysis ◽  
Centrifugal Distortion Constants

Abstract a-type rotational transitions of molecules in the vibrational ground state of thioketene, H2C=C=S, have been measured in the millimeter wavelength region. The measurements yielded improved rotational constants:A = 286 655(82) MHz,B = 5 659.47596(72) MHz,C = 5 544.51269(72) MHz.A detailed centrifugal distortion analysis by means of Watson's S-reduced Hamiltonian led to the determination of four quartic, two sextic and two higher order distortion constants:DJ = 1.08569(4) kHz, HJK = 0.716(20) Hz, DJK = 168.269(77) kHz, HKJ = -408.7(73) Hz, D1 = -25.46(68) Hz, LKJ = 0.65(24) Hz, d2 = - 5.21(35) Hz, SKJ = -0.0533(24) Hz. Effective rotational and centrifugal distortion constants using planarity conditions were calculated. The electric dipole moment of thioketene was determined to be μ = 1.01(3) D.

The Millimeter Wave Rotational Spectra of Carbonyl Sulfide

1980 ◽  
Vol 35 (5) ◽  
pp. 471-474 ◽  
Author(s):  
A. Dubrulle ◽  
J. Demaison ◽  
J. Burie ◽  
D. Boucher
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Vibrational State ◽  
Carbonyl Sulfide ◽  
Molecular Constants ◽  
Rotational Spectra ◽  
Vibrational Ground State ◽  
Isotopic Species ◽  
Absorption Spectrometer

Abstract The following rotational spectra of carbonyl sulfide have been accurately remeasured with a beam-absorption spectrometer:16O12C32S in the vibrational ground state and in the vibrational state 0 11 0.16O12C34S in the vibrational ground state.The ground state spectra of the following isotopic species have been measured with a video spectrometer:17O12C32S, 18O12C32S, 16O13C32S, 16O12C33S, 16O12C36S, and 16O13C34S.Our measurements have enabled us to improve the molecular constants notably for these cases.

scholarly journals The Rotational Spectrum of Propane Centrifugal Distortion Analysis

1985 ◽  
Vol 40 (5) ◽  
pp. 508-510 ◽  
Author(s):  
G. Bestmann ◽  
H. Dreizler ◽  
J. M. Vacherand ◽  
D. Boucher ◽  
B. P. van Eijck ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Millimeter Wave ◽  
Ground State ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Astrophysical Interest ◽  
Distortion Analysis ◽  
Wave Spectrometer

The ground state rotational spectrum of propane has been investigated between 6.4 and 26.5 GHz with a microwave Fourier transform spectrometer and between 140 and 300 GHz with a millimeter-wave spectrometer. High J transitions have been measured and fitted to a centrifugally distorted Hamiltonian including some sextic coefficients. The results of the analysis are sufficiently accurate for the prediction of all strong transitions of astrophysical interest.

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