Ultracold collisions and reactions of vibrationally excited OH radicals with oxygen atoms

2011 ◽  
Vol 13 (42) ◽  
pp. 19067 ◽  
Author(s):  
Juan Carlos Juanes-Marcos ◽  
Goulven Quéméner ◽  
Brian K. Kendrick ◽  
Naduvalath Balakrishnan
Keyword(s):  
Oh Radicals ◽  
Vibrationally Excited ◽  
Ultracold Collisions ◽  
Oxygen Atoms

Studies of the reactions of excited oxygen atoms and molecules produced in the flash photolysis of ozone

1960 ◽  
Vol 254 (1278) ◽  
pp. 317-326 ◽  
Keyword(s):  
Flash Photolysis ◽  
Vibrational Energy ◽  
Oh Radicals ◽  
Chain Reaction ◽  
Vibrationally Excited ◽  
Detailed Mechanism ◽  
Photolytic Decomposition ◽  
Excited Oxygen ◽  
Electronic Ground ◽  
Oxygen Atoms

The photolytic decomposition of ozone has been further investigated using the technique of flash photolysis. Earlier results have been extended and a detailed mechanism for the production of vibrationally excited oxygen molecules put forward. Comparative studies of the decomposition with and without traces of water present have shown that the 1 D oxygen atom must be responsible for the chain reaction in both cases. When dry ozone is photolyzed under isothermal conditions, absorption due to vibrationally excited oxygen molecules in their electronic ground states is detected. These molecules are produced by the reaction O + O 3 → O* 2 + O 2 with up to 17 quanta of vibrational energy, and are rotationally cold. When water is present, however, no absorption due to O* 2 occurs but strong OH absorption is seen and it is shown that OH radicals are responsible for propagating the chain reaction in this case. These radicals can only be formed by the reaction O( 1 D ) + H 2 O → 2OH + O 2 , leading to chain branching. It is an interesting observation that this reaction must be preferred to that with ozone stated above. This conclusion will be examined later. Reactions of 1 D oxygen atoms with fluorine, chlorine, bromine and hydrogen have also been investigated.

AN IMPROVED TECHNIQUE FOR THE OBSERVATION OF INFRARED CHEMILUMINESCENCE: RESOLVED INFRARED EMISSION OF OH ARISING FROM THE SYSTEM H + O2

1960 ◽  
Vol 38 (10) ◽  
pp. 1742-1755 ◽  
Author(s):  
P. E. Charters ◽  
J. C. Polanyi
Keyword(s):  
Infrared Spectrum ◽  
Electronic State ◽  
Vibrational Temperature ◽  
Infrared Emission ◽  
Multiple Reflection ◽  
Ground Electronic State ◽  
Oh Radicals ◽  
Vibrationally Excited ◽  
Improved Technique ◽  
First Time

A multiple reflection apparatus for the observation of infrared chemiluminescence is described. By means of this apparatus infrared emission from the system H + O2 has been identified as being due to vibrationally excited OH radicals in levels v = 1, 2, and 3 of the ground electronic state. The resolved infrared spectrum of the OH fundamental has been observed for the first time without interference from other emission. The most likely source of excited OH is the reaction H + HO2 → OH† + OH. The vibrational 'temperature' of OH† (vibrationally excited OH in its ground electronic state) in our system is in the region of TV = 2240 °K. These findings are discussed in relation to Krassovsky's suggestion that reaction between H and O2 could account for the Meinel hydroxyl bands in the night sky.

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.

Infrared Chemiluminescence from the Reactions of Oxygen Atoms with Halomethanes

1974 ◽  
Vol 52 (2) ◽  
pp. 271-280 ◽  
Author(s):  
S. J. Arnold ◽  
G. H. Kimbell ◽  
D. R. Snelling
Keyword(s):  
Reaction Step ◽  
Vibrationally Excited ◽  
Oxygen Atoms

Infrared chemiluminescence from vibrationally excited CO was observed when CH3Cl, CH2Cl2, CHCl3, or CH2Br2 was introduced into a stream of oxygen atoms. Emission from vibrationally excited HCl was also observed from CH2Cl2 and CHCl3. The mechanisms describing the reactions of oxygen atoms with these molecules are discussed in detail. The reaction step responsible for the formation of CO† is postulated to be[Formula: see text]and for HCl†[Formula: see text]

scholarly journals Direct Measurement of the Radiative Lifetime of Vibrationally Excited OH Radicals

2005 ◽  
Vol 95 (1) ◽  
Author(s):  
Sebastiaan van de Meerakker ◽  
Nicolas Vanhaecke ◽  
Mark van der Loo ◽  
Gerrit Groenenboom ◽  
Gerard Meijer
Keyword(s):  
Direct Measurement ◽  
Radiative Lifetime ◽  
Oh Radicals ◽  
Vibrationally Excited

Electron Resonance of Vibrationally Excited OH Radicals

1971 ◽  
Vol 49 (17) ◽  
pp. 2207-2210 ◽  
Author(s):  
K. P. Lee ◽  
W. G. Tam ◽  
R. Larouche ◽  
G. A. Woonton
Keyword(s):  
Hyperfine Interaction ◽  
Hydroxyl Radicals ◽  
Recent Experiment ◽  
Oh Radicals ◽  
Vibrationally Excited ◽  
Electron Resonance ◽  
Vibrational Levels ◽  
G Factors

Hydroxyl radicals in the vibrational levels ν = 1, 2, 3, and 4 of 2Π3/2, J = 3/2 state were observed by means of electron resonance at a frequency of 8.9 GHz. The lambda doubling frequencies, the g factors, and the hyperfine interaction constants are obtained and they are in agreement with the results of another recent experiment.

Sign in / Sign up

Export Citation Format

Share Document