ISSN:0005-9021    

DOI:10.1002/bbpc.198800164

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.198800165

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.198800166

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.198800167

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.198800168

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

摘要:

AbstractThe reactions of fluorine atoms with normal and deuterated methanols have been studied at low pressure using a fast discharge flow reactor. Samples were withdrawn continuously via a molecular beam sampling system and were analyzed by a mass‐spectrometer. — The rate constants have been determined relative to the reactionfor the reactions (1)–(4) were found ask1a/k1b= 0.40/0.60;k2a/k2b= 0.37/0.63;k3a/k3b= 0.39/0.61; andk4a/k4b= 0.36

ISSN:0005-9021    

DOI:10.1002/bbpc.198800169

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

摘要:

AbstractGas phase reactions of CH2(ã1A1) with benzene C6H6and acetylene C2H2were investigated at room temperature. CH2(ã1A1) was generated by laser photolysis of CH2CO at λL= 308 nm and the reactions were monitored directly by measuring the removal of CH2(ã1A1) with laser‐induced fluorescence (LIF). For the measurement of the formation rate of3CH2by physical deactivation LMR detection was used. The total removal of CH2(ã1A1) was found to be very efficient with rate constants of 2.4 ± 0.5 and 2.2 ± 0.2 (in 1014cm3/mol s) for C6H6and C2H2, respectively. The physical deactivation of1CH2to3CH2is about 30 resp. 22 percent of the total removal rate. Activation rates of3CH2to1CH

ISSN:0005-9021    

DOI:10.1002/bbpc.198800170

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

摘要:

AbstractThe reaction between CH3radicals and NO was investigated behind incident shock waves at temperatures between 1800 and 2150 K and total densities near 2 · 10−6mol cm−3. — The consumption of CH3was followed by time‐resolved UV‐absorption measurements at λ = 216 nm. — A rate constant of 2·1010cm3mol−1s−1for the reaction\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm CH}_3 + {\rm NO} \to {\rm prod}} & {\left(1 \right)} \\\end{array} $$\end{document}at temperatures around 1900 K was determined. — An activation energy of about 8

ISSN:0005-9021    

DOI:10.1002/bbpc.198800171

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

摘要:

AbstractThe analysis of the measured temperature dependences of self‐diffusion coefficients for prolate ellipsoid type molecules of α,ω‐dibromo‐methane, ‐ethane, ‐octane, ‐decane and ‐dodecane performed in the frame of the modified Perrin model enabled to discover anisotropy of translational diffusion in liquids. On the basis of the Eyring theory the effect was confirmed and the jump length of about 7 Å for all the molecules was derived. The same jump length for longer molecules was obtained from the Cohen‐Turnbull

ISSN:0005-9021    

DOI:10.1002/bbpc.198800172

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY

摘要:

AbstractChemical reaction steps have been monitored by29Si NMR in the liquid stage of a sol‐gel process during the preparation of glasses in the ternary system 65SiO2—20TiO2—15ZrO2from the corresponding alkoxides. Most of the recorded signals could be assigned to monomer species and larger building units, and the time evolution of the spectra of the two‐component systems Si/Ti and Si/Zr has been correlated with that of the pure starting material TEOS. No evidence has been found for the formation of ≡Si —O—Ti≡ or ≡ Si —O —Zr≡ bonds in the early polymerization. Quantitative considerations of the29Si spectra have revealed the main condensation pathways in the Si/Ti system.29Si MAS NMR yields, as a preliminary result, a higher branching of the network when passing from the dried gel

ISSN:0005-9021    

DOI:10.1002/bbpc.198800173

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1988

数据来源: WILEY