Energy and pressure dependence of the CO2 laser induced dissociation of sulfur hexafluoride

1977 ◽  
Vol 12 (3) ◽  
pp. 265-276 ◽  
Author(s):  
W. Fu\ ◽  
T. P. Cotter
Keyword(s):  
Co2 Laser ◽  
Pressure Dependence ◽  
Sulfur Hexafluoride

scholarly journals A Sulfur Hexafluoride Sensor Using Quantum Cascade and CO2 Laser-Based Photoacoustic Spectroscopy

Sensors ◽  
2010 ◽  
Vol 10 (10) ◽  
pp. 9359-9368 ◽  
Author(s):  
Mila Rocha ◽  
Marcelo Sthel ◽  
Guilherme Lima ◽  
Marcelo da Silva ◽  
Delson Schramm ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Photoacoustic Spectroscopy ◽  
Sulfur Hexafluoride ◽  
Quantum Cascade

CO2 laser-induced formation of carbonyl fluoride and sulfur tetrafluoride from carbon monoxide and sulfur hexafluoride

1980 ◽  
Vol 45 (11) ◽  
pp. 2890-2894 ◽  
Author(s):  
Josef Pola
Keyword(s):  
Carbon Monoxide ◽  
Co2 Laser ◽  
Sulfur Hexafluoride ◽  
Consecutive Reactions ◽  
Major Reaction ◽  
Sulfur Tetrafluoride ◽  
Carbonyl Fluoride

Reaction of SF6 with CO was initiated with a cw CO2 laser and shown to represent a system of two competitive consecutive reactions, namely the reaction between SF6 and CO affording COF2 and SF4, and the reaction between SF4 and CO leading to SOF2 and CF4. The former, major, reaction is favored with lower consumption of SF6 and lower SF6/CO ratio in the initial SF6-CO mixture.

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.

Pressure and fluence dependence in the decomposition of cyclobutanone vaporby a pulsed CO2 laser

1982 ◽  
Vol 60 (20) ◽  
pp. 2542-2545 ◽  
Author(s):  
R. A. Back
Keyword(s):  
Energy Density ◽  
Co2 Laser ◽  
Pressure Dependence ◽  
High Fluence ◽  
Absorbed Energy ◽  
Product Ratio ◽  
Pulsed Co2 Laser ◽  
Low Pressures ◽  
Apparent Disagreement ◽  
Fluence Dependence

A re-examination of the decomposition of cyclobutanone vapor by a pulsed CO2 laser over a range of pressure and fluence has shown that the apparent disagreement in previous measurements of the pressure dependence of the C3H6/C2H4 product ratio can be explained by differences in absorbed energy density. At low pressures of cyclobutanone, the energy of the decomposing molecules is apparently higher at low fluence than at high fluence, and an explanation is suggested in terms of a variation in the relative proportions of "collision-modified" and "collision-free" reactions with changing pressure and absorbed energy density.

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.

CO2 Laser-induced fluorination of some carbon oxides and sulfides by sulfur hexafluoride

1982 ◽  
Vol 47 (3) ◽  
pp. 918-927 ◽  
Author(s):  
Josef Pola
Keyword(s):  
Laser Radiation ◽  
Co2 Laser ◽  
Sulfur Hexafluoride ◽  
Carbon Oxides ◽  
Thermally Induced ◽  
Carbon Compounds

The cw CO2 laser induced interactions between SF6 and carbon compounds as CO2, C3O2, CO, COS, and CS2 are reported and their mechanism is discussed. The results show SF6 activated by laser radiation to fluorinate carbon compounds of their fragments to yield COF2, SOF2, CF4 and C2F6. The laser-induced processes are shown to possess features different from those of the appropriate thermally induced reactions.

Continuous wave CO2 laser driven oxidation of 2-butene and 2-octafluorobutene

1989 ◽  
Vol 54 (11) ◽  
pp. 3083-3087
Author(s):  
Josef Pola ◽  
Josef Vítek
Keyword(s):  
Co2 Laser ◽  
Ground State ◽  
Carbonyl Compounds ◽  
Sulfur Hexafluoride ◽  
Continuous Wave ◽  
Molecular Ground State

CW CO2 laser induced reactions of 2-butene and 2-octafluorobutene with molecular ground state 3O2 oxygen in the presence of sulfur hexafluoride afford products that can be rationalized by means of the earlier proposed mechanism involving transient dioxetane and its cleavage into carbonyl compounds.

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