Ground state spectroscopic constants of isothiocyanic acid, HNCS, from its microwave and millimeter wave spectra combined with far infrared data

1979 ◽  
Vol 78 (2) ◽  
pp. 189-202 ◽  
Author(s):  
Koichi Yamada ◽  
Manfred Winnewisser ◽  
Gisbert Winnewisser ◽  
L.B. Szalanski ◽  
M.C.L. Gerry
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Far Infrared ◽  
Spectroscopic Constants ◽  
Wave Spectra ◽  
Infrared Data

Infrared spectrum of HNCO between 8 and 80 cm−1

1984 ◽  
Vol 62 (12) ◽  
pp. 1452-1466 ◽  
Author(s):  
L. Fusina ◽  
M. Carlotti ◽  
B. Carli
Keyword(s):  
Infrared Spectrum ◽  
Ground State ◽  
Far Infrared ◽  
Spectroscopic Constants ◽  
Centrifugal Distortion ◽  
Excited Vibrational State ◽  
Millimetre Wave ◽  
Band Origin ◽  
Centrifugal Distortion Constants ◽  
Infrared Data

The infrared spectrum of isocyanic acid, HNCO, has been recorded in the range 8–80 cm−1 with a resolution of about 0.004 cm−1a-type and b-type rotational transitions have been measured and assigned in the ground state and in the ν4 = 1, ν5 = 1, ν6 = 1, and ν5 = 2 vibrational states.Improved values of the ground state rotational and centrifugal distortion constants in the Ir S-reduced Hamiltonian of Watson have been obtained in a simultaneous analysis of our measurements and microwave, millimetre-wave, and far infrared data reported previously. Sub-band origins and effective spectroscopic constants have been determined for each excited vibrational state. An accurate value for the ν6 band origin, at 656.287 cm−1, has been deduced.

scholarly journals The Submillimeter-wave Spectrum of the Formaldehyde Isotopomer H2C18O in its Ground Vibrational State

2000 ◽  
Vol 55 (5) ◽  
pp. 486-490 ◽  
Author(s):  
Holger S. P. Müller ◽  
Ralf Gendriesch ◽  
Frank Lewen ◽  
Gisbert Winnewisser
Keyword(s):  
Ground State ◽  
Vibrational State ◽  
Wave Spectrum ◽  
Far Infrared ◽  
Submillimeter Wave ◽  
Spectroscopic Constants ◽  
Published Data ◽  
Rotational Spectrum ◽  
Natural Isotopic Composition ◽  
Ground Vibrational State

Abstract The ground state rotational spectrum of H2C18O has been studied between 485 and 835 GHz with a sample of natural isotopic composition. Additional lines have been recorded around 130 GHz and near 1.85 THz, using a recently developed far-infrared laser-sideband spectrometer. The accurate new line frequencies were fit together with previously published data to obtain greatly improved spectroscopic constants. Both Watson's S and A reduced Hamiltonians have been employed yielding the rotational constants AA = 281 961.215 (82), BA = 36 902.275 51 (36), CA = 32 513.405 89 (36), AA = 281 961.371 (82), BA = 36 904.173 32 (91), and CA = 32 511.524 65 (86) MHz, respectively.

Ground state parameters of BiH3 from infrared and millimeter-wave spectra: ground state and equilibrium structures

2004 ◽  
Vol 226 (1) ◽  
pp. 24-31 ◽  
Author(s):  
W. Jerzembeck ◽  
H. Bürger ◽  
F.L. Constantin ◽  
L. Margulès ◽  
J. Demaison
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectra ◽  
Equilibrium Structures

Sub-millimeter Wave Spectra of Cyanoacetylene and Revised Ground State Constants

1995 ◽  
Vol 50 (12) ◽  
pp. 1179-1181 ◽  
Author(s):  
K. M. T. Yamada ◽  
A. Moravec ◽  
G. Winnewisser
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Vibrational State ◽  
Frequency Region ◽  
Wave Spectra ◽  
Centrifugal Distortion ◽  
Ground Vibrational State ◽  
Wave Data ◽  
Centrifugal Distortion Constants ◽  
Wave Spectrometer

Abstract Sixteen new rotational transitions of cyanoacetylene in the ground vibrational state have been measured in the frequency region from 570 GHz to 710 GHz by the Cologne sub-millimeter wave spectrometer. The observed transition frequencies were analyzed together with unpublished millimeter wave data of our group and with the data available in the literature. Precise rota­ tional constant and the quartic and sextic centrifugal distortion constants have been determined; B = 4549.058224(37) MHz, D = 0.544110(19) kHz, and H = 0.0345(21) mHz.

scholarly journals Rotational Spectrum of Methylcyanoacetylene A New Millimeter Wave Spectrometer

1983 ◽  
Vol 38 (1) ◽  
pp. 64-67 ◽  
Author(s):  
M. Bester ◽  
M. Tanimoto ◽  
B. Vowinkel ◽  
G. Winnewisser ◽  
Koichi Yamada
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectra ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Reflex Klystron ◽  
Wave Spectrometer

Abstract The ground state rotational spectrum of methylcyanoacetylene, CH3CCCN, has been observed between 8 and 90 GHz, yielding precise rotational constants and a determination of the nuclear hyperfine costant eqQ = -4.0 ± 0.2 MHz. The millimeter wave spectra (70 - 90 GHz) were obtained with a newly constructed spectrometer, employing a synthesizer - controlled reflex klystron as source.

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