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2001 (2)
1Author    A. Guarnieri, A. HuckaufRequires cookie*
 Title    The Rotational Spectrum of (170)Ketene  
 Abstract    The rotational spectrum of H2CC17O in the ground vibrational state has been investigated between 20 and 330 GHz. From 82 /?-branch transitions a set of rotational constants and several centrifugal distortion constants could be derived, employing the Watson 5-reduction formalism. The obtained rotational constants in MHz are: A = 282071.6(223), B = 10013.4764(28), C = 9655.9118(24). The nuclear quadrupole coupling structure of the J'KaiKci <— JKaKc = loi Ooo line has been recorded by means of molecular beam Fourier transform microwave spectroscopy allowing the determination o f the nuclear quadrupole constant Xaa. = -1.534(54) MHz (without considering the spin-rotation interaction). A recalculation of the rs-structure has also been carried out, using the constants of the new isotopomer. The result agrees with the values reported by East et al. in 1995. This is, to our knowledge, the first reported investigation of the H2CC170 rotational spectrum. 
  Reference    Z. Naturforsch. 56a, 440—446 (2001); received April 9 2001 
  Published    2001 
  Keywords    Rotational Spectra, Structure, Ketene, Isotopomer 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0440.pdf 
 Identifier    ZNA-2001-56a-0440 
 Volume    56 
2Author    C. Thomsen, H. DreizlerRequires cookie*
 Title    The Microwave Spectra of m-Xylene and m-Xylene-d10. Determination of the Low Methyl Internal Rotation Barrier  
 Abstract    The rotational spectra of m-xylene, (CHahCöH^ and of m-xylene-dio, (CDs^CöD,*, have been recorded between 6 and 26.5 GHz using pulsed beam Fourier transform microwave spectroscopy. The clue for the assignment of the internal rotation multiplets was the inertial defect derived from the ^4i^4i species transitions. The rotational constants for m-xylene and m-xylene-dio are A = 3572.1117(1) MHz / 2896.1195(17) MHz, B = 1761.8621(1) MHz / 1446.0236(15) MHz, C =1197.3943(2) MHz / 988.2357(7) MHz, the barrier to internal rotation of the two methyl groups are V3 = 53.7(16) J/mol / 39.8(5) J/mol, their moments of inertia were assumed to be Ia = 3.14 uA2 / 6.28 uA2. 
  Reference    Z. Naturforsch. 56a, 635—640 (2001); received August 29 2001 
  Published    2001 
  Keywords    Rotational Spectra, Low Methyl Internal Rotation Barriers, Two Top Molecules, Molecular Beam Fourier Transform Microwave Spectroscopy 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0635.pdf 
 Identifier    ZNA-2001-56a-0635 
 Volume    56