Vibrationally Excited OD Radicals from the Reaction of Oxygen Atoms with Chemisorbed Deuterium on Tungsten

1998 ◽  
Vol 102 (13) ◽  
pp. 2372-2380 ◽  
Author(s):  
H. K. Shin
Keyword(s):  
Vibrationally Excited ◽  
Oxygen Atoms

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

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 An Experimental Study of the Products of Dissociative Recombination of Molecular Ions with Electrons

1987 ◽  
Vol 120 ◽  
pp. 29-30
Author(s):  
F. Vallée ◽  
J.C. Gomet ◽  
B.R. Rowe ◽  
J.L. Quéffelec ◽  
M. Morlais
Keyword(s):  
Experimental Study ◽  
Experimental Method ◽  
Charge Exchange ◽  
Total Yield ◽  
Dissociative Recombination ◽  
Molecular Ions ◽  
Vibrationally Excited ◽  
Large Yield ◽  
Oxygen Atoms

A new experimental method has been developed which allows determination of the products nature in dissociative recombination (D.R.) of molecular ions. Results are presented on H2O+ D.R. which show that there is a large yield of oxygen atoms in this reaction. the measurements give a total yield for the two channel O + H + H and O + H2 of 0.45 and therefore a yield of 0.55 for OH + H. H2O+ ions are formed by charge exchange from N+ ions and are probably vibrationally excited in this experiment.

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.

Infrared Chemiluminescence from the Reaction of Oxygen Atoms with Chloroethylenes

1974 ◽  
Vol 52 (14) ◽  
pp. 2608-2612 ◽  
Author(s):  
S. J. Arnold ◽  
G. H. Kimbell ◽  
D. R. Snelling
Keyword(s):  
Initial Step ◽  
Reaction Step ◽  
Vibrationally Excited ◽  
Cis And Trans ◽  
Oxygen Atoms

Infrared chemiluminescence from vibrationally excited CO and from vibrationally excited HCl was observed when C2H3Cl, 1,1-C2H2Cl2, cis- and trans-1,2-C2H2Cl2, or C2HCl3 was introduced into a stream of oxygen atoms. The mechanisms describing the reactions of oxygen atoms with these molecules are discussed in detail. The initial step is postulated to involve the formation of an aldehyde and a carbene. The reaction step responsible for the formation of CO† is postulated to be[Formula: see text]and for HCl†[Formula: see text]

Study of the reaction of oxygen atoms with vibrationally excited ozone molecules

1979 ◽  
Vol 68 (2-3) ◽  
pp. 386-390 ◽  
Author(s):  
S.K. Chekin ◽  
Yu.M. Gershenzon ◽  
A.V. Konoplyov ◽  
V.B. Rozenshtein
Keyword(s):  
Vibrationally Excited ◽  
Oxygen Atoms

Catalytic CO Oxidation on Unreconstructed Cu(110) by Reactive As-Adsorbed Oxygen Atoms below 230 K

1996 ◽  
Vol 100 (3) ◽  
pp. 1048-1054 ◽  
Author(s):  
Tsuyoshi Sueyoshi ◽  
Takehiko Sasaki ◽  
Yasuhiro Iwasawa
Keyword(s):  
Co Oxidation ◽  
Adsorbed Oxygen ◽  
Catalytic Co Oxidation ◽  
Oxygen Atoms

Modification of optical properties of PC-PBT/Cr2O3 and PC-PBT/CdS nanocomposites by gamma irradiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20402
Author(s):  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Color Difference ◽  
Band Gap Energy ◽  
Polybutylene Terephthalate ◽  
Γ Irradiation ◽  
Gap Energy ◽  
Vis Spectroscopy ◽  
Oxygen Atoms

Nanocomposite (NCP) films of polycarbonate-polybutylene terephthalate (PC-PBT) blend as a host material to Cr2O3 and CdS nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Samples from the PC-PBT/Cr2O3 and PC-PBT/CdS NCPs were irradiated using different doses (20–110 kGy) of γ radiation. The induced modifications in the optical properties of the γ irradiated NCPs have been studied as a function of γ dose using UV Vis spectroscopy and CIE color difference method. Optical dielectric loss and Tauc's model were used to estimate the optical band gaps of the NCP films and to identify the types of electronic transition. The value of optical band gap energy of PC-PBT/Cr2O3 NCP was reduced from 3.23 to 3.06 upon γ irradiation up to 110 kGy, while it decreased from 4.26 to 4.14 eV for PC-PBT/CdS NCP, indicating the growth of disordered phase in both NCPs. This was accompanied by a rise in the refractive index for both the PC-PBT/Cr2O3 and PC-PBT/CdS NCP films, leading to an enhancement in their isotropic nature. The Cr2O3 NPs were found to be more effective in changing the band gap energy and refractive index due to the presence of excess oxygen atoms that help with the oxygen atoms of the carbonyl group in increasing the chance of covalent bonds formation between the NPs and the PC-PBT blend. Moreover, the color intensity, ΔE has been computed; results show that both the two synthesized NCPs have a response to color alteration by γ irradiation, but the PC-PBT/Cr2O3 has a more response since the values of ΔE achieved a significant color difference >5 which is an acceptable match in commercial reproduction on printing presses. According to the resulting enhancement in the optical characteristics of the developed NCPs, they can be a suitable candidate as activate materials in optoelectronic devices, or shielding sheets for solar cells.

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