Surface-aligned reaction of photogenerated oxygen atoms with carbon monoxide targets

Nature ◽  
10.1038/19260 ◽  
1999 ◽  
Vol 398 (6728) ◽  
pp. 591-593 ◽  
Author(s):  
C. Emil Tripa ◽  
John T. Yates
Keyword(s):  
Carbon Monoxide ◽  
Oxygen Atoms

THE DECOMPOSITION OF CARBON DIOXIDE BY Hg 6(3P1) AND Hg 6(3P0) ATOMS

1961 ◽  
Vol 39 (11) ◽  
pp. 2244-2250 ◽  
Author(s):  
Otto P. Strausz ◽  
Harry E. Gunning
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Light Intensity ◽  
Chemical Method ◽  
Direct Evidence ◽  
Mercury Vapor ◽  
Maximum Effect ◽  
Electronically Excited ◽  
Oxygen Atoms

Carbon dioxide has been shown to decompose into carbon monoxide and oxygen atoms, when exposed to radiation at 2537 Å, in the presence of mercury vapor. The rate rises steeply with decreasing substrate pressure, and varies directly with the 1.8 ± 0.1 power of the light intensity. The proposed mechanism attributes reaction to the collision of electronically excited CO2 molecules with Hg 6(3P1) atoms. The suppression of reaction at higher substrate pressures is readily explained in terms of collisional deactivation of the excited CO2 species. Nitrogen was found to increase the rate of CO formation; the maximum effect was obtained for a mixture of 7.4 mm nitrogen and 3.74 mm carbon dioxide, in which case the rate was 1.58 times that for pure substrate. It is shown that nitrogen serves to generate metastable Hg 6(3P0) atoms, which can sensitize the decomposition. The reaction might serve as a chemical method for monitoring Hg 6(3P0) atoms. For CO2–N2 mixtures, the rate was found to rise when the reacting system was exposed to radiation at 4047 Å. This is taken as direct evidence of sensitization by higher states of mercury, generated by stepwise excitation, since radiation at 4047 Å converts Hg 6(3P0) to Hg 7(3S1).

Recombination of carbon monoxide and oxygen atoms

1978 ◽  
Vol 10 (5) ◽  
pp. 503-517 ◽  
Author(s):  
J. E. Hardy ◽  
W. C. Gardiner ◽  
A. Burcat
Keyword(s):  
Carbon Monoxide ◽  
Oxygen Atoms

Production of Vibrationally Excited Carbon Monoxide by the Reaction of Oxygen Atoms with Acetylene, Methylacetylene, and Methane

1973 ◽  
Vol 51 (3) ◽  
pp. 451-455
Author(s):  
S. J. Arnold ◽  
G. H. Kimbell
Keyword(s):  
Carbon Monoxide ◽  
Electrical Discharge ◽  
Population Inversion ◽  
Continuous Wave ◽  
Microwave Discharge ◽  
Vibrationally Excited ◽  
Vibrational Population ◽  
Oxygen Atoms

Infrared chemiluminescence attributed to the first overtone of CO was observed when either C2H2 or was introduced into a stream of oxygen which had been passed through a microwave discharge. The addition of vibrationally cold CO to these systems was found to produce a vibrational population inversion in the chemically formed CO. CO first overtone emission was not observed when CH4 was introduced into a similar stream of oxygen unless the CH4 had been subjected to a microwave discharge. These observations are used to clarify the mechanisms governing the formation of CO in continuous wave air–helium–hydrocarbon electrical discharge lasers.

PRELIMINARY STUDY OF PHOTOCHEMICAL BEHAVIOR IN THE SYSTEM NITROGEN DIOXIDE – ETHANE

1955 ◽  
Vol 33 (5) ◽  
pp. 843-848
Author(s):  
T. M. Rohr ◽  
W. Albert Noyes Jr.
Keyword(s):  
Nitric Oxide ◽  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Nitrogen Dioxide ◽  
Room Temperature ◽  
Reverse Reaction ◽  
Primary Process ◽  
Photochemical Behavior ◽  
Preliminary Study ◽  
Oxygen Atoms

The addition of ethane to nitrogen dioxide either during exposure to radiation transmitted by pyrex, or afterwards, reduces the amount of oxygen formed. At room temperature this is apparently due to the effectiveness of ethane in promoting the reverse reaction of nitric oxide and oxygen to form nitrogen dioxide. At temperatures over 100° there is a reaction which uses oxygen atoms produced in the primary process. Nitroethane (or nitrosoethane) is formed along with carbon monoxide, carbon dioxide, and some methane. The results suggest that acetaldehyde is an intermediate, but acetaldehyde could not be detected because it would react thermally with nitrogen dioxide. It is not possible to give a complete explanation of the results, but suggestions can be made which might form the basis for later work.

A shock tube study of the recombination of carbon monoxide and oxygen atoms

1977 ◽  
Vol 66 (2) ◽  
pp. 598-604 ◽  
Author(s):  
Anthony M. Dean ◽  
Don C. Steiner
Keyword(s):  
Carbon Monoxide ◽  
Shock Tube ◽  
Tube Study ◽  
Oxygen Atoms

REACTION OF OXYGEN ATOMS WITH BENZENE

1961 ◽  
Vol 39 (12) ◽  
pp. 2436-2443 ◽  
Author(s):  
G. Boocock ◽  
R. J. Cvetanović
Keyword(s):  
Activation Energy ◽  
Carbon Monoxide ◽  
Room Temperature ◽  
Main Reaction ◽  
Main Reaction Product ◽  
Kcal Mole ◽  
Volatile Material ◽  
Formed Adduct ◽  
Decomposition Of Nitrous Oxide ◽  
Oxygen Atoms

The reaction of benzene with oxygen atoms produced by mercury photosensitized decomposition of nitrous oxide has been studied in a circulating system at room temperature. The main reaction product is a non-volatile material probably largely aldehydic in character. This is tentatively assumed to result from the rearrangement and polymerization of the initially formed adduct. Smaller amounts of phenol and carbon monoxide are also formed. The rate of formation of carbon monoxide decreases with increasing pressure, suggesting an energy-rich precursor.Oxygen atoms react with benzene much more slowly than with olefines. At 120° cyclopentene reacts about 150 times more quickly than benzene. The activation energy of the reaction of oxygen atoms with benzene has been estimated at 4.6 to 4.9 kcal/mole, with an uncertainty of about 0.7 kcal/mole.

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