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1996 (1)
1991 (1)
1Author    Kirsten Vormann, Helmut DreizlerRequires cookie*
 Abstract    o ro n a n d N itr o g e n H y p e rfin e S tr u c tu r e in th e R o ta tio n a l S p e c tr u m o f A m in o d iflu o ro b o ra n e The boron and nitrogen hyperfine structure in the rotational spectra of aminodifluoroborane has been investigated and the quadrupole coupling constants of1 and nitrogen have been determined. We get the following results for the nuclear quadrupole coupling constants: ^aa(n B) = —1.971 (6) MHz, xbh(11B) = -0.500(11) MHz, *cc(n B) -2.471 (11) MHz, and *aa(14N) = 0.890 (5) MHz, Zbfc(14N) = 2.303 (7) MHz, xcc(14N) = -3.193 (8) MHz. Additionally we determined rotational and centrifugal distortion constants according to Watson's A reduction. 
  Reference    Z. Naturforsch. 46a, 909—913 (1991); received July 11 1991 
  Published    1991 
  Keywords    Microwave spectroscopy, nuclear quadrupole hyperfine structure, aminodifluoroborane 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0909.pdf 
 Identifier    ZNA-1991-46a-0909 
 Volume    46 
2Author    Jürgen Preusser, Manfred WinnewisserRequires cookie*
 Title    Nuclear Quadrupole Hyperfine Structure of the Direct /-Type Transitions of the Fulminic Acid Isotopomers H 12 C 14 N 16 0 and H 13 C 14 N 16 0  
 Abstract    The direct I-type transitions of H l3 C ,4 N l6 0 in the vibrational states (i^i's) = (01) and (03) were measured in the frequency range from 18 to 40 GHz. These transitions show a nuclear quadrupole hyperfine structure caused by the l4 N nucleus, which could partially be resolved at Doppler-limited resolution. The analogous transitions of the parent species. H l2 C l4 N 16 0, were remeasured. They displayed a very similar hyperfine structure, also partially resolved. The hyperfine patterns of both H l2 C l4 N l6 0 and H 13 C 14 N 16 0 were analysed by means of contour fitting s to the absorption profiles. The parameter l^eQq, which is responsible for the splittings, is determined to be 645(20) kHz for the vibrational state (01) and 890(44) kHz for the vibrational state (03) for H l2 C l4 N l6 0 and 642(32) kHz for (01) and 898(22) kHz for (03) for H 13 C l4 N 16 0. This unexpectedly large splitting parameter for states involving the large amplitude motion (HCN bending) is discussed as another consequence of the quasilinearity of fulminic acid, in view of the fact that the analogous transitions for the vibrational state (10) (NCO bending) do not split or even show a significant line broadening at the resolution used for the present measurements. 
  Reference    Z. Naturforsch. 51a, 207—214 (1996); received February 17. 1996 
  Published    1996 
  Keywords    Nuclear quadrupole hyperfine structure, quasilinear molecule, microwave spectroscopy 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0207.pdf 
 Identifier    ZNA-1996-51a-0207 
 Volume    51