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.

Rotational spectrum and spectroscopic constants of the phosphine molecule in the ground vibrational state

1981 ◽  
Vol 86 (1) ◽  
pp. 184-192 ◽  
Author(s):  
S.P. Belov ◽  
A.V. Burenin ◽  
L.I. Gershtein ◽  
A.F. Krupnov ◽  
V.N. Markov ◽  
...  
Keyword(s):  
Vibrational State ◽  
Spectroscopic Constants ◽  
Rotational Spectrum ◽  
Ground Vibrational State

The Submillimeter-wave Spectrum of Propyne, CH3CCH

2000 ◽  
Vol 55 (5) ◽  
pp. 491-494 ◽  
Author(s):  
Holger S. P. Müller ◽  
Sven Thorwirth ◽  
Luca Bizzocchi ◽  
Gisbert Winnewisser
Keyword(s):  
Ground State ◽  
Wave Spectrum ◽  
Submillimeter Wave ◽  
Rotational Spectrum ◽  
Quantum Numbers

Abstract The ground state rotational spectrum of propyne has been studied in selected regions between 509 and 820 GHz spanning the quantum numbers 29

Pure Rotation Spectrum of NNO in the Far Infrared Region

1990 ◽  
Vol 45 (6) ◽  
pp. 837-838 ◽  
Author(s):  
Koichi M. T. Yamada
Keyword(s):  
Vibrational State ◽  
Far Infrared ◽  
Infrared Region ◽  
Submillimeter Wave ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectrum ◽  
Precise Data ◽  
Pure Rotation ◽  
Least Squares Fit ◽  
Rotation Spectrum

AbstractThe pure rotational spectrum of NNO has been observed as an impurity in the NO spectrum which has been recorded with a high resolution Fourier transform spectrometer. The observed high-J transitions in the ground vibrational state were analyzed by a least-squares fit together with the available millimeter and submillimeter wave data. It has been proved that the highly precise data of Maki et al. [3] can be used as a wavenumber standard for the far infrared.

scholarly journals Ground State Centrifugal Distortion Constants of Vinyl Isocyanide, CH2-CH-NC, from the Microwave and Millimeter Wave Rotational Spectra

1975 ◽  
Vol 30 (5) ◽  
pp. 672-689 ◽  
Author(s):  
Koichi Yamada ◽  
Manfred Winnewisser
Keyword(s):  
Ground State ◽  
Hyperfine Splitting ◽  
Vibrational State ◽  
Frequency Region ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Ground Vibrational State ◽  
Rotational Spectra ◽  
Measured Absorption ◽  
Centrifugal Distortion Constants

Abstract The pure rotational spectrum of vinyl isocyanide in the ground vibrational state has been as-signed in the frequency region from 8 GHz to 180 GHz. The measured absorption lines encompass 157 a-type transitions from the qRK , qQ1, qQ2,qQ3, qQ4 and qQ5 branches and 48 b-type transitions from the rP0 , rP1, rP2, rP3 , rP4 , rP5, rQ0 , and rQ1 branches for values of J up to 54. The rotational constants have been refined and all quartic and sextic centrifugal distortion constants have been determined using Watson's reduced Hamiltonian. No quadrupole hyperfine splitting was observed.

The submillimeter-wave spectrum and spectroscopic constants of SO2 in the ground state

1984 ◽  
Vol 106 (1) ◽  
pp. 235-244 ◽  
Author(s):  
M. Carlotti ◽  
G. Di Lonardo ◽  
L. Fusina ◽  
B. Carli ◽  
F. Mencaraglia
Keyword(s):  
Ground State ◽  
Wave Spectrum ◽  
Submillimeter Wave ◽  
Spectroscopic Constants

scholarly journals J-Dependence of T2-Parameters for Rotational Transitions of SO2 and CH3OH in K-Band

1985 ◽  
Vol 40 (7) ◽  
pp. 683-685 ◽  
Author(s):  
S. C. Mehrotra ◽  
H. Dreizler ◽  
H. Mäder
Keyword(s):  
Fourier Transform ◽  
Quantum Number ◽  
Ground State ◽  
Significant Variation ◽  
Vibrational State ◽  
Rotational Quantum Number ◽  
Fourier Transform Spectrometer ◽  
Ground Vibrational State ◽  
Rotational Transitions ◽  
Upper Level

With the help of a microwave Fourier transform spectrometer in the range from 18 GHz to 26 GHz, the coefficients ß for the linear pressure depedence of collisional dephasing rates 1/T2 have been determined by the transient emission technique for fourteen pure rotational transitions of SO2 with 5 ≦ J' ≦ 66 in the ground vibrational state, twelve transitions with 8 ≦ J' ≦ 62 in the first excited bending vibrational state, and twelve transitions of methanol with 2 ≦ J' ≦ 11, where J' is the rotational quantum number of the upper level of a transition. The T2-parameter ß for the transition J(K-, K+) - 49(4, 46 ) - 48(5, 43) of SO2 in the ground state shows an anomalous behaviour, whereas the values for all other transitions show a J-dependence in accordance with previous results. No significant variation of T2-parameters with J has been found for the rotational transitions of CH3OH.

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

Spectroscopic investigations of hydrogen bonding interactions in the gas phase. IX. Vibrational satellites in the rotational spectrum of the hydrogen-bonded homodimer HCN • • • HCN

1985 ◽  
Vol 399 (1817) ◽  
pp. 377-390 ◽  
Keyword(s):  
Gas Phase ◽  
Ground State ◽  
Hydrogen Cyanide ◽  
Spectroscopic Constants ◽  
Rotational Spectrum ◽  
Optimum Conditions ◽  
Frequency Range ◽  
Hydrogen Bonding Interactions ◽  
Microwave Spectrometer ◽  
Simulation Of Spectra

The rotational spectrum of the hydrogen cyanide dimer has been observed in the frequency range 26-40 GHz by using a Stark-modulated microwave spectrometer. Although the spectrum is very weak, even under optimum conditions, it has been possible to assign vibrational satellites in the v β progression based on the ground state and in the v β progression based on v σ ═ 1 with the aid of the computer simulation of spectra and the ground-state spectroscopic constants. The spectroscopic constants now available for the hydrogen cyanide dimerare summarized as follows: (HC 14 N) 2 (DC 14 N) 2 (HC 15 N) 2 v β ═ 1 ← 0/cm -1 35±5 30±5 35±5 v σ ═ 1 ← 0/cm -1 101 ─ ─ B o /MHz 1745.80973(50) 1661.18(26) 1684.28825(25) D J /kHz 2.133(30) (1.873) 1.900(30) r c. m ./nm 44.496 ─ 44.499 K σ /(Nm -1 ) 8.14 ─ 8.51 α β /MHz ─20.07 (2) ─17.73 (27) ─18.74 (9) γ β /MHz 0.266 (4) 0.242 (36) 0.250 (17) q β /MHz 5.33 (4) 5.44 (13) 5.15 (10) α σ /MHz (31.44) ─ ─

Submillimeter Wave Spectrum of HS34SH

1989 ◽  
Vol 44 (8) ◽  
pp. 718-722 ◽  
Author(s):  
P. Mittler ◽  
G. Winnewisser ◽  
K. M. T. Yamada
Keyword(s):  
Wave Spectrum ◽  
Submillimeter Wave ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Complete Set ◽  
First Time

Abstract The rotational spectrum of 34S-substituted disulfane, HS34SH, has been measured between 60 and 420 GHz, yielding for the first time the rotational constants A = 146694.949 MHz, B = 6779.018 MHz and C = 6776.339 MHz, together with a complete set of J4 and J6 distortion constants.

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