IR laser induced decomposition of trifluoroacetic, pentafluoropropionic and heptafluorobutyric anhydrides

1990 ◽  
Vol 55 (10) ◽  
pp. 2460-2467 ◽  
Author(s):  
Pavel Kubát ◽  
Josef Pola
Keyword(s):  
Gas Phase ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Parent Compound ◽  
Theoretical Treatment ◽  
Phase Decomposition ◽  
Ir Laser ◽  
Mndo Calculations ◽  
Induced Decomposition ◽  
Heptafluorobutyric Anhydride

The continuous-wave CO2 laser induced gas-phase decomposition of trifluoroacetic, pentafluoropropionic and heptafluorobutyric anhydride, sensitized by sulfur hexafluoride was studied in order to determine the course of the reactions in the absence of wall effects. The decompositions of all the compounds are assumed to involve cleavage of parent compound into acyl fluoride F(CF2)nCOF and .(CF2)nCO2. biradical, the latter undergoing decay into CO and F(CF2)n-1COF compounds. The theoretical treatment of the biradical by MNDO calculations as well as trapping with ethene are presented.

Carbonyl fluoride formation by cw-CO2 laser-induced and sulfur hexafluoride-sensitized decomposition of hexafluoroacetone

1981 ◽  
Vol 46 (5) ◽  
pp. 1254-1257 ◽  
Author(s):  
Josef Pola ◽  
Pavel Engst ◽  
Milan Horák
Keyword(s):  
Gas Phase ◽  
Co2 Laser ◽  
Sulfur Hexafluoride ◽  
Phase Decomposition ◽  
First Order ◽  
First Order Kinetics ◽  
Cw Co2 Laser ◽  
Carbonyl Fluoride

The cw-CO2 laser-induced gas phase decomposition of hexafluoroacetone sensitized with sulfur hexafluoride (both 0.7-5.2 kPa) affords, besides perfluorinated hydrocarbons and minor amounts of trifluoroacetyl fluoride, carbonyl fluoride the formation of that obeys first-order kinetics and is favored with higher SF6 content.

IR laser-induced decomposition in thiirane for gas-phase deposition of conjugated organosulfur polymer incorporating cycloheptasulfur

2012 ◽  
Vol 93 ◽  
pp. 165-169 ◽  
Author(s):  
Jadranka Blazevska-Gilev ◽  
Markéta Urbanová ◽  
Dana Pokorná ◽  
Jan Šubrt ◽  
Josef Pola
Keyword(s):  
Gas Phase ◽  
Ir Laser ◽  
Induced Decomposition ◽  
Gas Phase Deposition

CO2 laser-induced decomposition of methyl iodide sensitized by sulfur hexafluoride

1980 ◽  
Vol 45 (7) ◽  
pp. 1910-1919 ◽  
Author(s):  
Klaus Dathe ◽  
Pavel Engst ◽  
Josef Pola ◽  
Milan Horák
Keyword(s):  
Methyl Iodide ◽  
Co2 Laser ◽  
Decomposition Rate ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Gaseous Mixtures ◽  
Exciting Photon ◽  
Irradiation Energy ◽  
Induced Decomposition

Gaseous mixtures of methyl iodide and sulfur hexafluoride yield upon irradiation by a continuous-wave CO2 laser iodine, methane, ethane, ethylene and acetylene - the products of methyl iodide decomposition. The decomposition rate and the mutual ratio of the products is dependent on the delivered irradiation energy, the methyl iodide/sulfur hexafluoride ratio and the energy of the exciting photon. Methyl iodide-d3 in the mixture with SF6 behaves similarly as methyl iodide yielding perdeuterated methane, ethane, ethylene, acetylene and iodine.

LASER-DRIVEN SYNTHESIS OF CARBON AND SILICON CLUSTERS FROM GAS-PHASE REACTANTS

1996 ◽  
Vol 03 (01) ◽  
pp. 807-811 ◽  
Author(s):  
M. EHBRECHT ◽  
H. FERKEL ◽  
V.V. SMIRNOV ◽  
O. STELMAKH ◽  
W. ZHANG ◽  
...  
Keyword(s):  
Gas Phase ◽  
Flow Reactor ◽  
Carbon Clusters ◽  
Molecular Flow ◽  
Silicon Cluster ◽  
Nanosized Particles ◽  
Silicon Clusters ◽  
Molecular Gases ◽  
Induced Decomposition ◽  
Cluster Beams

A newly developed technique is employed for the production of carbon and silicon cluster beams starting from gaseous compounds. It is based on the CO 2-laser-induced decomposition of molecular gases containing carbon and silicon, such as CO 2H2 and SiH 4, in a flow reactor. In order to decompose acetylene, SF 6 is used as a sensitizer. By introducing a skimmer into the reaction zone, the generated silicon and carbon clusters are transferred to free molecular flow and analyzed with a time-of-flight mass spectrometer. It is shown that the technique can be efficiently employed to produce fullerenes C 60 and C 70 and, in the case of silicon, ultrapure nanosized particles of up to 3-nm diameter.

IR laser-induced decomposition of poly(vinyl chloride-co-vinyl acetate): Control of products by irradiation conditions

2006 ◽  
Vol 91 (11) ◽  
pp. 2560-2566 ◽  
Author(s):  
Jaroslav Kupčík ◽  
Jadranka Blazevska-Gilev ◽  
Jan Šubrt ◽  
Vladimír Vorlíček ◽  
Josef Pola
Keyword(s):  
Vinyl Acetate ◽  
Vinyl Chloride ◽  
Ir Laser ◽  
Poly Vinyl Chloride ◽  
Induced Decomposition

Catalysis by hydrogen halides in the gas phase. XIX. 2,3-Dimethylbutan-2-ol and hydrogen bromide

1968 ◽  
Vol 21 (10) ◽  
pp. 2385 ◽  
Author(s):  
RL Johnson ◽  
VR Stimson
Keyword(s):  
Gas Phase ◽  
Arrhenius Equation ◽  
Hydrogen Bromide ◽  
Phase Decomposition ◽  
Hydrogen Halides ◽  
First Order

The gas-phase decomposition of 2,3-dimethylbutan-2-ol into 2,3-dimethylbut-1-ene, 2,3-dimethylbut-2-ene, and water, catalysed by hydrogen bromide at 303-400�, is described. The rate is first-order in each reactant and the Arrhenius equation k2 = 1011.88 exp(-26490/RT) sec-l ml mole-1 is followed. The olefins appear to be in their equilibrium proportions. The effects of substitutions in the alcohol at Cα and Cβ on the rate are discussed.

scholarly journals Gas-phase aluminium acetylacetonate decomposition: Revision of the current mechanism by VUV synchrotron radiation

2021 ◽  
Author(s):  
Sebastian Grimm ◽  
Seung-Jin Baik ◽  
Patrick Hemberger ◽  
Andras Bodi ◽  
Andreas Kempf ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Synchrotron Radiation ◽  
Gas Phase ◽  
Vapor Deposition ◽  
Aluminium Oxide ◽  
Chemical Vapor ◽  
Phase Decomposition ◽  
Common Precursor ◽  
Current Mechanism

Although aluminium acetylacetonate, Al(C5H7O2)3, is a common precursor for chemical vapor deposition (CVD) of aluminium oxide, its gas phase decomposition is not very well investigated. Here, we studied its thermal...

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