Recombination of Iodine Atoms by Flash Photolysis over a Wide Temperature Range. V. I2 in CF4, SF6, CO2, Ne, Kr

1973 ◽  
Vol 51 (20) ◽  
pp. 3394-3397 ◽  
Author(s):  
Hen Won Chang ◽  
George Burns
Keyword(s):  
Wide Temperature Range ◽  
Rate Constants ◽  
Recombination Rate ◽  
Flash Photolysis ◽  
Temperature Range ◽  
Recombination Reactions

Recombination rate constants for iodine atoms in CF4, SF6, CO2, Ne, and Kr were studied by flash photolysis. The results can be summar ized as follows:[Formula: see text]These rate constants are compared with those available in the literature, and analyzed, qualitatively, in terms of current theories of recombination reactions.

Flash photolysis under non-isothermal conditions

1967 ◽  
Vol 45 (20) ◽  
pp. 2369-2374 ◽  
Author(s):  
George Burns
Keyword(s):  
Temperature Rise ◽  
Rate Constants ◽  
Recombination Rate ◽  
Reaction Rate ◽  
Flash Photolysis ◽  
Bromine Atom ◽  
Fold Increase ◽  
Reaction Vessel ◽  
Reaction Rate Constants ◽  
Three Body

The temperature rise which accompanies every flash photolytic reaction interferes with, and often makes impractical, measurements of the reaction rate constants. This difficulty may be partly overcome if the whole reaction vessel is uniformly irradiated by both the photolytic and the analyzing flash lamps.A flash photolysis apparatus with these characteristics was used to study bromine atom recombination. A 10 to 15 fold gain in atomic concentration, which corresponds to a 100 to 225 fold increase in three-body recombination rate, compared with the work of previous authors, was achieved with this apparatus. The reaction rate constants were determined from the changes in absorption of Br2 at either 4 035 Å or at 4 980 Å. The recombination rate constant of bromine in an excess of helium at 90 ± 20 °C was found to be equal to (0.8 ± 0.3)109 l2 mole−2 s−1 (measured at 4 980 Å) and (0.5 ± 0.1)109 l2 mole−2 s−1 (measured at 4 035 Å). The results suggest that the technique herein described can yield meaningful data, even though the reaction was accompanied by a 105 °C temperature rise. There was little heat exchanged between the reacting gas and the walls of the reaction vessel. Consequently the reaction vessel behaved as an effective calorimeter throughout the reaction.

Recombination of Iodine Atoms by Flash Photolysis over a Wide Temperature Range. II I2 in He, Ar, Xe, N2, CO

1972 ◽  
Vol 56 (6) ◽  
pp. 3155-3161 ◽  
Author(s):  
J. K. K. Ip ◽  
George Burns
Keyword(s):  
Wide Temperature Range ◽  
Flash Photolysis ◽  
Temperature Range

Recombination of Br Atoms by Flash Photolysis over a Wide Temperature Range. III. Br2 in Xe, CF4, SF6

1971 ◽  
Vol 54 (4) ◽  
pp. 1835-1837 ◽  
Author(s):  
S. K. Chang ◽  
A. G. Clarke ◽  
G. Burns
Keyword(s):  
Wide Temperature Range ◽  
Flash Photolysis ◽  
Temperature Range

Recombination of iodine atoms by flash photolysis over a wide temperature range. VI. I2 in HCl, DCl, HBr, and SO2

1975 ◽  
Vol 62 (6) ◽  
pp. 2426-2428 ◽  
Author(s):  
H. W. Chang ◽  
George Burns
Keyword(s):  
Wide Temperature Range ◽  
Flash Photolysis ◽  
Temperature Range

Recombination of Br atoms by flash photolysis over a wide temperature range

1967 ◽  
Vol 44 ◽  
pp. 241 ◽  
Author(s):  
J. K. K. Ip ◽  
George Burns
Keyword(s):  
Wide Temperature Range ◽  
Flash Photolysis ◽  
Temperature Range
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