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1991 (1)
1Author    Uwe Hohm, Klaus KerlRequires cookie*
 Title     
 Abstract    n o m a lo u s B e h a v io u r o f th e M e a n D ip o le P o la r iz a b ility a o f N e o p e n ta n e C (C H 3) 4 in th e T e m p e r a tu r e R a n g e b e tw e e n 2 5 0 K a n d 3 6 0 K The temperature dependence of the dynamic dipole polarizability ot(Ä) of gaseous neopentane has been re-examined in the temperature range between T = 250 K and T — 360 K at the four HeNe-laser wavelengths a = 543.51 nm, 594.11 nm, 611.97 nm, and 632.99 nm. These interferometric mea­ surements are compared with former determinations of the dynamic as well as the static dipole polarizability in the solid, liquid and gaseous state. In all cases, a shape of a(T) in the range between 290 K and 310 K has been observed which is similar to the shape of a (A) in an absorption band. This observation is connected with other physico-chemical quantities of neopentane. 
  Reference    Z. Naturforsch. 46a, 983—988 (1991); received July 6 1991 
  Published    1991 
  Keywords    Thermal excitation, Refractive index, Polarizability, Gases, Neopentane 
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 TEI-XML for    default:Reihe_A/46/ZNA-1991-46a-0983.pdf 
 Identifier    ZNA-1991-46a-0983 
 Volume    46 
2Author    J. Nolte, J. Grußdorf, F. Temps, H. Gg, WagnerRequires cookie*
 Title    Kinetics of the Reaction HOCO + 0 2 in the Gas Phase  
 Abstract    Using the discharge flow method, the kinetics of the gas phase reaction HOCO + 0 2 products (1) was investigated at room temperature and pressures around p « 2.0 mbar with Far Infrared Laser Magnetic Resonance (FIR-LMR) detection of HOCO, H0 2 , and OH. From the measured concen-tration-versus-time decay profiles of HOCO in the absence and presence of a large excess of 0 2 , the overall rate constant of the reaction was found to be k, (296 K) = (9.9 ±1.5) • 10 11 cm 3 /mol • s. The main reaction channel, which leads to production of H0 2 + C0 2 , could be established. 
  Reference    Z. Naturforsch. 48a, 1234—1238 (1993); received November 3 1993 
  Published    1993 
  Keywords    Chemical kinetics, Gases, Radicals, Spectroscopy, Laser Magnetic Resonance 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1234.pdf 
 Identifier    ZNA-1993-48a-1234 
 Volume    48 
3Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    Acceleration of mass transfer in gas I liquid-reactions by sonic vibrations: fat hydrogenation as a test reaction A method for increasing the mass transfer in gas/liquid-reactions by application of sonic vibration is described. The operating frequencies have been chosen such that the surfaces of the gas bubbles vibrate in resonance. At these operating frequencies (up to 1000 Hz), the damping of sound waves by the bubbly liquid is low, which is important in large-scale applications. Hydrogenation of soybean oil in a bubble column has been carried out as a test reaction. An increase in mass transfer from dispersed bubbles to the liquid in terms of fcL aG of up to 36% has been effected by a relatively small amount of sonic power. B e s c h le u n ig u n g d e s S to f f a u s ta u s c h e s von G a s -F lü s s ig k e its -R e a k tio n e n d u rc h S c h a llw e lle n a m B e isp ie l d e r F e tth ä r tu n g 
  Reference    Z. Naturforsch. 50a, 228—234 (1995); received November 14 
  Published    1995 
  Keywords    Mass transfer, Fat hydrogenation, Gas, Liquid, Sound, Surface waves 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0228.pdf 
 Identifier    ZNA-1995-50a-0228 
 Volume    50