The Millimeter- and Submillimeter-Wave Spectra of Acetaldehyde: Centrifugal Distortion and Internal Rotation Analysis

1987 ◽  
Vol 42 (1) ◽  
pp. 97-102 ◽  
Author(s):  
H. Maes ◽  
G. Wlodarczak ◽  
D. Boucher ◽  
J. Demaison
Keyword(s):  
Internal Rotation ◽  
Submillimeter Wave ◽  
Accurate Prediction ◽  
Wave Spectra ◽  
Centrifugal Distortion ◽  
Astrophysical Interest

141 internal rotation doublets (282 transitions, among which 174 new measurements) of acetaldehyde in its ground torsional state have been measured up to 600 GHz (J ≦ 32). An overall fit of the measurements (including the lines identified by previous workers) using the Internal Axis Method has allowed us to accurately determine the rotational, centrifugal distortion and internal rotation constants. The quality of the fit is good enough to permit the accurate prediction of transition frequencies of possible astrophysical interest.

Centrifugal Distortion and Internal Rotation Analysis of the Rotational Spectrum of Methyl Thiocyanate

1986 ◽  
Vol 41 (5) ◽  
pp. 743-746 ◽  
Author(s):  
H. Maes ◽  
B. P. van Eijck ◽  
A. Dubrulle ◽  
J. Demaison
Keyword(s):  
Internal Rotation ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Astrophysical Interest ◽  
Rotation Parameters ◽  
Methyl Thiocyanate

The ground state rotational spectrum of methyl thiocyanate has been investigated between 7 and 300 GHz (J ≦ 38 and K_ ≦ 25). An overall fit of the measurements using the Internal Axis Method has allowed us to accurately determine the internal rotation parameters. For the A substate effective rotational parameters are given which allow the calculation of transition frequencies of possible astrophysical interest.

The Millimeter and Submillimeter-Wave Spectrum of Dimethylether

1990 ◽  
Vol 45 (5) ◽  
pp. 702-706 ◽  
Author(s):  
W. Neustock ◽  
A. Guarnieri ◽  
J. Demaison ◽  
G. Wlodarczak
Keyword(s):  
Internal Rotation ◽  
Wave Spectrum ◽  
Submillimeter Wave ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Centrifugal Distortion Constants

Abstract We report the analysis of the rotational spectrum of dimethylether measured between 60 and 400 GHz. Rotational and quartic centrifugal distortion constants are given. Internal rotation splittings are analysed with the I AM method. The value of is compared to the values obtained for similar molecules

Millimeter- and submillimeter-wave spectra of AuCl and AuBr in the X1Σ+ electronic ground states

2003 ◽  
Vol 220 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Toshiaki Okabayashi ◽  
Emi Yamazaki ◽  
Kazuhiro Tsukamoto ◽  
Mitsutoshi Tanimoto
Keyword(s):  
Ground States ◽  
Submillimeter Wave ◽  
Wave Spectra ◽  
Electronic Ground

scholarly journals Millimeter and submillimeter wave spectra of mono-13C-acetaldehydes

2015 ◽  
Vol 579 ◽  
pp. A46 ◽  
Author(s):  
L. Margulès ◽  
R. A. Motiyenko ◽  
V. V. Ilyushin ◽  
J. C. Guillemin
Keyword(s):  
Submillimeter Wave ◽  
Wave Spectra

The Rotational Spectrum of Monothioformic Acid. I. cis-and trans-HC(:O)SH1,2

1976 ◽  
Vol 31 (5) ◽  
pp. 422-437
Author(s):  
William H. Hocking ◽  
Gisbert Winnewisser
Keyword(s):  
Frequency Region ◽  
Absorption Lines ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Astrophysical Interest ◽  
Rotational Spectra ◽  
Measured Line ◽  
Centrifugal Distortion Constants ◽  
Cis And Trans ◽  
Line Positions

Abstract The rotational spectra of the two abundant isomers of monothioformic acid, cis- and trans- HC(:O)SH, have been assigned in the frequency region 8 -250 GHz. Over 90 a-type transitions and over 60 b-type transitions have been measured for each rotamer. The a-type transitions belong to the qRK , qQ1, qQ2, qQ3 and qQ4 branches and the b-type absorption lines encompass the Ka = 1 - 0, 2 - 1, 3 - 2, 4 - 3 and 5 - 4 rotational sub-bands. The rotational constants and all quartic and sextic centrifugal distortion constants have been determined for each rotamer using Watson's reduced Hamiltonian. In addition to the measured line positions the frequencies of some selected low-J transitions, not observed in this work but of potential astrophysical interest, have been listed as an aid in the interstellar search for monothioformic acid.

Millimeter-Wave Spectrum of Ethyl Acetylene Centrifugal Distortion, Coriolis Interaction and Internal Rotation

1983 ◽  
Vol 38 (4) ◽  
pp. 447-451 ◽  
Author(s):  
J. Demaison ◽  
D. Boucher ◽  
J. Burie ◽  
A. Dubrulle
Keyword(s):  
Excited State ◽  
Internal Rotation ◽  
Plane Deformation ◽  
Wave Spectrum ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Coriolis Interaction ◽  
Methyl Group ◽  
First Excited State ◽  
Methyl Torsion

The rotational spectrum of ethyl acetylene has been investigated between 70 and 320 GHz. A Coriolis interaction has been found between the first excited state of the methyl torsion and the C - C = C in plane deformation. Splittings of transitions in the first excited torsional state show that the barrier hindering internal rotation of the methyl group amounts to 3271 cal/mole.

Microwave and submillimeter-wave spectra of CH3OH

1984 ◽  
Vol 103 (2) ◽  
pp. 486-494 ◽  
Author(s):  
K.V.L.N. Sastry ◽  
R.M. Lees ◽  
F.C. De Lucia
Keyword(s):  
Submillimeter Wave ◽  
Wave Spectra

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.

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