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1989 (1)
1978 (1)
1974 (1)
1Author    G. Gassler, B. Reißenauer, W. HüttnerRequires cookie*
 Abstract    u n a b le D io d e L a s e r S p e c tr a a n d A s s ig n m e n t o f th e 7 4 8 c m -1 B a n d o f P r o p a n e The rotational structure of the 748 cm"1 otype CH2-rocking fundamental of propane was analysed using tunable diode laser (TDL) techniques. On grounds of a low-resolution Fourier transform (FTIR) spectrum and of the known ground-state rotational and centrifugal-distortion constants, some 700 transitions were measured and assigned in several regions of the band. The upper-state constants determined in this way allow the prediction of rovibrational frequencies to within 0.003 cm""1, covering quantum states up to J = 50 and Ka = 20. The band appears un­ perturbed. 
  Reference    Z. Naturforsch. 44a, 316—324 (1989); received February 18 1989 
  Published    1989 
  Keywords    Propane, Diode laser spectra, Excited state, Rotational constants, Centrifugal distortion constants 
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 TEI-XML for    default:Reihe_A/44/ZNA-1989-44a-0316.pdf 
 Identifier    ZNA-1989-44a-0316 
 Volume    44 
2Author    Walter FabianRequires cookie*
 Title    W. Fabian * Eigenschaften von Molekülen in angeregten Zuständen 348 Properties of Molecules in Excited States  
 Abstract    Using bisisochinolin derivatives and related compounds it is shown that information about the fluorescent state can be obtained by comparison of experimental fluorescence data and calculated energies of the Si-state assuming various geometries. 
  Reference    Z. Naturforsch. 33b, 332—335 (1978); eingegangen am 7. September 1977 
  Published    1978 
  Keywords    Excited States, Fluorescence, PPP-Calculations, Phototautomerism, Bisisochinolin Deri-vatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0332.pdf 
 Identifier    ZNB-1978-33b-0332 
 Volume    33 
3Author    Wanda Wagner, Maria Zaborowska, Wlodzimierz Puzyna, David ShugarRequires cookie*
 Title    Studies on Purine-Pyrimidine Hydrogen Bonded Base Pairing by Means of Absorption and Emission Spectroscopy  
 Abstract    Procedures are described for measurement of association constants between potentially com­ plementary purine and pyrimidine bases by hydrogen bonding in non-aqueous medium by means of absorption and emission spectroscopy. The methods require that one of the two constituents be fluorescent and exhibit a long wavelength absorption band not, or only partially, overlapped by the second constituent. The foregoing has been applied to measurements of the association constants, and other parameters, of hydrogen-bonded complexes of 2-aminopurine with 1-substituted uracil, thymine and barbital in chloroform solution, both in the ground and excited states. It was estab­ lished that the 1:1 hydrogen-bonded base pairs 2-aminopurine : 1-cyclohexyluracil and 2-amino­ purine: 1-octylthymine maintain the ground-state equilibrium during the life time of the excited state, whereas for the corresponding pair 2-aminopurine: 1-methylbarbital this equilibrium is per­ turbed on excitation. The influence of N-alkylation of the 2-aminopurine residue on base-pairing with the pyrimidines has also been examined. The results are compared with those obtained by other methods. The specific advantages of the procedures employed, and their possible applications to studies on the behaviour of fluorescent residues in polynucleotides, are discussed. 
  Reference    (Z. Naturforsch. 29c, 672 [1974]; received August 1 1974) 
  Published    1974 
  Keywords    Purines and Pyrimidines, Hydrogen Bonding, Base-pairing, Excited States, Fluorescence 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0672.pdf 
 Identifier    ZNC-1974-29c-0672 
 Volume    29