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2000 (2)
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1997 (3)
1Author    Ralf Schmidt, Christian Gebauer, Olaf Klein, Wolfhart SeidelRequires cookie*
 Title    Anisotropie Interaction Potentials for He-Pyrrole, He-Furane and He-Thiophene from total Differential Cross Section Measurements  
 Abstract    Differential cross section measurements are reported for scattering of an improved He-atomic beam by crossed beams of Pyrrole, Furane and Thiophene. The damping of the DCS diffraction oscillations is used to extract reliable anisotropic intermolecular potentials, applying the infinite order sudden approximation (IOSA). 
  Reference    Z. Naturforsch. 52a, 317—322 (1997); received September 19 1996 
  Published    1997 
  Keywords    Molecular Beams, Helium, Interaction Potentials, Aromaticity, Heterocyclic Compounds 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0317.pdf 
 Identifier    ZNA-1997-52a-0317 
 Volume    52 
2Author    Markus Hammer, Wolfhart SeidelRequires cookie*
 Title    Helium Atom Scattering from C 2 H 6 , F 2 HCCH 3 , F 3 CCH 2 F and C 2 F 6 in Crossed Molecular Beams  
 Abstract    Rotationally unresolved differential cross sections were measured in crossed molecular beam exper-iments by scattering Helium atoms from Ethane, 1,1-Difluoroethane, 1,1,1,2-Tetrafluoroethane and Hexafluoroethane. The damping of observed diffraction oscillations was used to extract anisotropic interaction potentials for these scattering systems applying the infinite order sudden approximation (IOSA). Binary macroscopic parameters such as second heterogeneous virial coefficients and the coefficients of diffusion and viscosity were computed from these potentials and compared to results from macroscopic experiments. 
  Reference    Z. Naturforsch. 52a, 695—701 (1997); received August 8 1997 
  Published    1997 
  Keywords    Molecular beams, Helium, Interaction potential, Fluoroethanes, Binary coefficients 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0695.pdf 
 Identifier    ZNA-1997-52a-0695 
 Volume    52 
3Author    H. Dreizler, N. HansenRequires cookie*
 Title    High Resolution Microwave Spectroscopy of Ethyl Vinyl Ether: Accurate Determination of the Methyl Top Internal Rotation Barrier  
 Abstract    We have performed an investigation of the internal rotation of the methyl group in trans-cis ethyl vinyl ether by using molecular beam-Fourier transform Microwave (MB-FTMW) spectroscopy. Rotational spectra (up to J = 20) were recorded in the frequency region 4-19 GHz. Due to the internal rotation of the methyl group, some rotational transitions were split and the torsional barrier could be determined to V 3 (CH 3) = 1074.4(4) cm -1 . 
  Reference    Z. Naturforsch. 55a, 481—185 (2000); received February 9 2000 
  Published    2000 
  Keywords    Molecular Beam, Microwave Spectroscopy, Internal Rotation 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0481.pdf 
 Identifier    ZNA-2000-55a-0481 
 Volume    55 
4Author    Christian Gebauer, Olaf Klein, Ralf Schmidt, Wolfhart SeidelRequires cookie*
 Title    Helium Atom Scattering from Cyclopentane, Pyrrolidine and Tetrahydrofurane in Crossed Molecular Beams  
 Abstract    Scattering of helium atoms by cyclopentane, pyrrolidine and tetrahydrofurane molecules was ob-served in crossed molecular beam experiments. The intensity of scattered helium atoms, depending on the scattering angle, was measured with high resolution, and the damping of the diffraction oscil-lations of the differential cross sections was used to extract elastic anisotropic interaction potentials for these molecules. The evaluation included a geometric transformation concerning the puckered states of the envelope and the twisted conformation of the molecules. The potentials were found to be rather similar. 
  Reference    Z. Naturforsch. 52a, 425—431 (1997); received February 27 1997 
  Published    1997 
  Keywords    Molecular beams, helium, saturated 5-rings, interaction potentials, ring puckering 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0425.pdf 
 Identifier    ZNA-1997-52a-0425 
 Volume    52 
5Author    H. MayerRequires cookie*
 Title    Reflection of Cluster Beams on Metal Surfaces: Momentum and Heat Transfer  
 Abstract    Beams of clusters, the latter containing about 10 6 nitrogen molecules, were reflected by polished met-al surfaces, and the direction, the velocity and the composition of the reflected beams were studied as functions of the direction of the incident beam. It turned out that the clusters leave the reflector surface almost tangentially, with reduced velocity, and that besides the clusters the beams contain gaseous ni-trogen formed during the impact. 
  Reference    Z. Naturforsch. 53a, 663—669 (1998); received March 8 1998 
  Published    1998 
  Keywords    Cluster Beams, Molecular Beams, Beam Surface Interaction, Cluster Reflection, Heat Transfer 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0663.pdf 
 Identifier    ZNA-1998-53a-0663 
 Volume    53 
6Author    D. H. Sutter, H. DreizlerRequires cookie*
 Title    Observation of Carbonyl Fluoride, Ketene, Acetic Acid and Fluorocarbene Produced by an Electric Discharge within a Nozzle by Molecular Beam Fourier Transform Microwave Spectroscopy. A Reaction via a Cycloaddition for Carbonyl Fluoride and Keten?  
 Abstract    A molecular beam Fourier transform microwave spectrometer, designed for the study of chemical reactions within electrical discharges, is described in detail. Applications include the production of carbonyl fluoride, ketene, acetic acid, and difluorocarbene. For the production of carbonyl fluoride and ketene with 1,1-difluoroethylene and carbon dioxide as precursor molecules a reaction path via a 2+2 cycloaddition is proposed. 
  Reference    Z. Naturforsch. 55a, 695—705 (2000); received June 10 2000 
  Published    2000 
  Keywords    Reactions and Syntheses in Electric Discharges, Molecular Beam, Product Identifica-tion by Fourier Transform Microwave Spectroscopy 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0695.pdf 
 Identifier    ZNA-2000-55a-0695 
 Volume    55