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.

Rotational Spectra of Phosphorus Monosulfide up to 1 THz

1999 ◽  
Vol 54 (2) ◽  
pp. 137-145
Author(s):  
H. Klein ◽  
E. Klisch ◽  
G. Winnewisser
Keyword(s):  
Submillimeter Wave ◽  
Rotational Spectrum ◽  
Data Set ◽  
Rotational Spectra ◽  
Quantum Numbers ◽  
Hyperfine Constants ◽  
Vibrational Ground State ◽  
Structure Constants ◽  
First Time ◽  
Rotation Constant

Abstract The submillimeter-wave rotational spectrum of the PS radical in the electronic and vibrational ground state (X2 ΠI/2 , X2Π3/2) was recorded with the Cologne terahertz spectrometer in the fre-quency region between 540 GHz and 1.07 THz, covering rotational quantum numbers from J = 30.5 to 60.5. The PS radical has been produced by discharging PSCl3 buffered with Ar. For all transitions the Λ-doubling was resolved for both the 2ΠI/2 and 2Π3/2 states. For some transitions with ΔF = 0 the hyperfine structure (hfs) caused by the P-atom could partially be resolved even for rather high J values. Analysis of the complete rotational data set of PS allows the derivation of a full set of molecular parameters, including the rotational constants B, D, H, the fine-structure constants A,γ , Dγ , the parameters for the Λ-doubling p, Dp , q, and the magnetic hyperfine constants a, b, c, d, CI. All parameters have been determined, whereby a, c, and the nuclear spin rotation-constant CI were obtained for the first time.

The Centrifugally Induced Pure Rotational Spectrum and the Structure of Sulfur Trioxide. A Microwave Fourier Transform Study of a Nonpolar Molecule

1991 ◽  
Vol 46 (8) ◽  
pp. 710-714 ◽  
Author(s):  
Volker Meyer ◽  
Dieter Hermann Sutter ◽  
Helmut Dreizler
Keyword(s):  
Fourier Transform ◽  
Sulfur Trioxide ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Nonpolar Molecule ◽  
Centrifugal Distortion Constants ◽  
First Time

AbstractThe pure rotational spectrum of sulfur trioxide has been observed for the first time. A total of 25 high-J transitions could be assigned. The rotational constants, two quartic centrifugal distortion constants, and three sextic centrifugal distortion constants were determined as: B= 10 449.0667(23) MHz, C = 5216.0330(12) MHz, DJ = 9.2651 (18) kHz, DJK = -16.3922(18) kHz, HJ, = -8.8(34) • 10-3 Hz, HJK= -15.8(73) • 10-3 Hz, and HKJ = 34.2(73) • 10-3 Hz. An r0- and an re -structure are presented: r0= 1.4198(7) Å (calculated from B), r0 = 1.4210(7) Å (calculated from C), and re = 1.4175 Å

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.

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

The rQ2-branch of HOOH at 1.05 THz

1994 ◽  
Vol 49 (4-5) ◽  
pp. 525-529 ◽  
Author(s):  
A. F. Krupnov ◽  
S. P. Belov ◽  
G. Winnewisser ◽  
J. Behrend ◽  
M. Liedtke ◽  
...  
Keyword(s):  
Internal Rotation ◽  
Potential Barrier ◽  
Radiation Source ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Backward Wave Oscillator ◽  
Clear Separation ◽  
Wave Oscillator ◽  
Backward Wave ◽  
First Time

Abstract The lower frequency rQ2-branch o f the torsional split rotational spectrum of HOOH has been recorded for the first time near 1.05 THz with Doppler limited resolution employing a Backward Wave Oscillator as the radiation source. The position of the Q-branch lines can be predicted very closely from a set of effective rotational constants derived individually for the two torsionally split levels. The symmetry of the molecule, and the height of the potential barrier against internal rotation, are the two main reasons for the clear separation between the rotational and torsional contributions to the spectrum of HOOH as well as the analogous molecule HSSH.

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

Resolution of the 14N Nuclear Quadrupole Hvperfine Structure in the Rotational Spectrum of Hydrazoic Acid, HN3, and Evaluation of the Rotational Constants of H15NNN and HNN15N

1989 ◽  
Vol 44 (11) ◽  
pp. 1079-1086
Author(s):  
M. C. L. Gerry ◽  
N. Heineking ◽  
H. Mäder ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Ab Initio ◽  
Coupling Constants ◽  
Hydrazoic Acid ◽  
Rotational Spectrum ◽  
Rotational Constants ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Fourier Transform Spectra ◽  
First Time

Microwave Fourier transform spectra have been measured for hydrazoic acid as its normal isotopomer, H14N3, and two substituted isotopomers, H15N14N14N and H14N14N15N. The 14N quadrupole hyperfine structure has been resolved in all cases, and the quadrupole coupling constants of all 14N atoms have been determined. They are compared with those from ab initio predictions. Rotational constants A have been evaluated accurately for the first time for the two 15N species, and have been used to confirm a previously published structure

scholarly journals The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study

2021 ◽  
Author(s):  
Alessandro Chiarini ◽  
Maurizio Quadrio
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Direct Numerical Simulation ◽  
Finite Differences ◽  
Turbulence Models ◽  
Fine Tuning ◽  
Rectangular Cylinder ◽  
Budget Equation ◽  
Complete Set ◽  
First Time

AbstractA direct numerical simulation (DNS) of the incompressible flow around a rectangular cylinder with chord-to-thickness ratio 5:1 (also known as the BARC benchmark) is presented. The work replicates the first DNS of this kind recently presented by Cimarelli et al. (J Wind Eng Ind Aerodyn 174:39–495, 2018), and intends to contribute to a solid numerical benchmark, albeit at a relatively low value of the Reynolds number. The study differentiates from previous work by using an in-house finite-differences solver instead of the finite-volumes toolbox OpenFOAM, and by employing finer spatial discretization and longer temporal average. The main features of the flow are described, and quantitative differences with the existing results are highlighted. The complete set of terms appearing in the budget equation for the components of the Reynolds stress tensor is provided for the first time. The different regions of the flow where production, redistribution and dissipation of each component take place are identified, and the anisotropic and inhomogeneous nature of the flow is discussed. Such information is valuable for the verification and fine-tuning of turbulence models in this complex separating and reattaching flow.

The Millimeter‐ and Submillimeter‐Wave Spectrum of the G t Conformer of n ‐Propanol ( n ‐CH 3 CH 2 CH 2 OH)

2006 ◽  
Vol 162 (2) ◽  
pp. 428-435 ◽  
Author(s):  
Atsuko Maeda ◽  
Frank C. De Lucia ◽  
Eric Herbst ◽  
John C. Pearson ◽  
Joanna Riccobono ◽  
...  
Keyword(s):  
Wave Spectrum ◽  
Submillimeter Wave

Enzyme system of Clostridium stercorarium for hydrolysis of arabinoxylan: reconstitution of the in vivo system from recombinant enzymes

Microbiology ◽  
2004 ◽  
Vol 150 (7) ◽  
pp. 2257-2266 ◽  
Author(s):  
Helmuth Adelsberger ◽  
Christian Hertel ◽  
Erich Glawischnig ◽  
Vladimir V. Zverlov ◽  
Wolfgang H. Schwarz
Keyword(s):  
Extracellular Enzymes ◽  
Enzyme System ◽  
Thermophilic Bacterium ◽  
Recombinant Enzymes ◽  
Type Mode ◽  
Complete Set ◽  
First Time ◽  
Hydrolysis Of

Four extracellular enzymes of the thermophilic bacterium Clostridium stercorarium are involved in the depolymerization of de-esterified arabinoxylan: Xyn11A, Xyn10C, Bxl3B, and Arf51B. They were identified in a collection of eight clones producing enzymes hydrolysing xylan (xynA, xynB, xynC), β-xyloside (bxlA, bxlB, bglZ) and α-arabinofuranoside (arfA, arfB). The modular enzymes Xyn11A and Xyn10C represent the major xylanases in the culture supernatant of C. stercorarium. Both hydrolyse arabinoxylan in an endo-type mode, but differ in the pattern of the oligosaccharides produced. Of the glycosidases, Bxl3B degrades xylobiose and xylooligosaccharides to xylose, and Arf51B is able to release arabinose residues from de-esterified arabinoxylan and from the oligosaccharides generated. The other glycosidases either did not attack or only marginally attacked these oligosaccharides. Significantly more xylanase and xylosidase activity was produced during growth on xylose and xylan. This is believed to be the first time that, in a single thermophilic micro-organism, the complete set of enzymes (as well as the respective genes) to completely hydrolyse de-esterified arabinoxylan to its monomeric sugar constituents, xylose and arabinose, has been identified and the enzymes produced in vivo. The active enzyme system was reconstituted in vitro from recombinant enzymes.

Sign in / Sign up

Export Citation Format

Share Document