Resonance between ground and excited vibrational state due to centrifugal distortion coupling in the rotational spectrum of HNCO

1980 ◽  
Vol 81 (1) ◽  
pp. 139-151 ◽  
Author(s):  
Koichi Yamada
Keyword(s):  
Vibrational State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Excited Vibrational State

Ground State Centrifugal Distortion Constants of Trans-Acrolein, CH2 = CH — CHO from the Microwave and Millimeter Wave Rotational Spectra 1,2

1975 ◽  
Vol 30 (8) ◽  
pp. 1001-1014 ◽  
Author(s):  
Manfred Winnewisser ◽  
Gisbert Winnewisser ◽  
T. Honda ◽  
E. Hirota
Keyword(s):  
Ground State ◽  
Vibrational State ◽  
Line Search ◽  
Frequency Region ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Measured Absorption ◽  
Centrifugal Distortion Constants ◽  
Line Positions

Abstract The pure rotational spectrum of trans-acrolein in the ground vibrational state has been assigned in the frequency region from 8 GHz to 180 GHz. The measured absorption lines encompass a-type transitions from the qRK, qQ1, qQ2 branches and 6-type transitions from the rP0, rP1, rP2, rR0 brandies for values of J up to 23. The rotational constants have been refined and all quartic and sextic centrifugal distortion constants have been determined using Watson's reduced Hamiltonian. This information has been used to predict line positions of astrophysical interest to warrant the interstellar line search for trans-acrolein.

Rovibrational Analysis of the ν3 Band of Diazomethane, H2CNN

1983 ◽  
Vol 38 (10) ◽  
pp. 1138-1145 ◽  
Author(s):  
Jürgen Vogt ◽  
Manfred Winnewisser
Keyword(s):  
Vibrational State ◽  
Centrifugal Distortion ◽  
Excited Vibrational State ◽  
Type Band ◽  
Centrifugal Distortion Constants ◽  
First Time

Abstract The ν3 fundamental of diazomethane. which essentially corresponds to a symmetric methylene deformation has been reinvestigated at a resolution of 0.07 cm-1 . The J- and Ka-structures of this A-type band have been resolved and analysed for the first time. The rovibrational assignment is given and, using Watson's S-reduced Hamiltonian, the rotational and quartic centrifugal distortion constants could be determined for the first excited vibrational state of the symmetric methylene deformation.

The Rotational Spectrum of Ketene Isotopomers with 18O and 13C Revisited

2003 ◽  
Vol 58 (5-6) ◽  
pp. 275-279 ◽  
Author(s):  
A. Guarnieri ◽  
A. Huckaufa
Keyword(s):  
Vibrational State ◽  
Frequency Region ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Ground Vibrational State ◽  
Rotational Spectra ◽  
Main Species ◽  
Centrifugal Distortion Constants

The pure rotational spectra of [18O]ketene, H2C=C18O, [1-13C]ketene, H2C=13CO, and [2-13C]ketene, H213C=CO, have been revisited in the frequency region 200 - 350 GHz in the ground vibrational state.From more than 100 R-branch transitions for each isotopomer a set of rotational and centrifugal distortion constants could be derived using the Watson S-reduction formalism. The values obtained for the rotational constants B and C agree very well with results of former investigations. The agreement is worse with respect to the A constants, but our newly determined A values agree well with the corresponding values of the main species and the 17O isotopomer.

Detection of the Infrared Spectrum of Cyanobutadiyne, HC5N

1981 ◽  
Vol 36 (10) ◽  
pp. 1052-1056 ◽  
Author(s):  
Koichi Yamada ◽  
Gisbert Winnewisser
Keyword(s):  
Infrared Spectrum ◽  
Diode Laser ◽  
Vibrational State ◽  
Tunable Diode Laser ◽  
Centrifugal Distortion ◽  
Laser Spectrometer ◽  
Excited Vibrational State ◽  
Diode Laser Spectrometer ◽  
Band Origin ◽  
Centrifugal Distortion Constants

The CN stretching band, ν2, of cyanobutadiyne has been detected by a tunable diode laser spectrometer in the wavenumber range from 2250 to 2260 cm-1. The P-and R-branch transitions, up to P(77) and R(75), of the fundamental band were identified and measured with the accuracy of 0.001 cm-1. The band origin was obtained to be 2256.12406(13) cm-1. The rotational and centrifugal distortion constants in the excited vibrational state, B′ and D′, were also determined.

Analysis of Centrifugal Distortion Effects in the Rotational Spectrum of Formyl Fluoride

1981 ◽  
Vol 36 (10) ◽  
pp. 1057-1061 ◽  
Author(s):  
Harold Jones ◽  
Volker Typke
Keyword(s):  
Ground State ◽  
Vibrational State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Distortion Analysis

The measurements of the ground state spectra of both HCOF and DCOF have been extended to high-J transition. The centrifugal distortion analysis clearly showed that in HCOF the inclusion of sextic terms is absolutely necessary, whereas the effects from this source in DCOF are smaller but not negligible. The planarity condition for the sextic terms was introduced to reduce the number of parameters. Spectra in the lowest vibrational state of both HCOF and DCOF were also treated.

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