The recombination of oxygen atoms in a discharge flow system

1964 ◽  
Vol 41 (8) ◽  
pp. 429 ◽  
Author(s):  
B. A. Thrush
Keyword(s):  
Flow System ◽  
Discharge Flow ◽  
Oxygen Atoms

Kinetics and detection of F(2P) atoms in a discharge flow system

1983 ◽  
Vol 79 (3) ◽  
pp. 351-360 ◽  
Author(s):  
M.A.A. Clyne ◽  
A. Hodgson
Keyword(s):  
Flow System ◽  
Discharge Flow

THE SILVER CATALYZED OXIDATION OF ETHYLENE: I. SLOW PROCESSES ON THE CATALYST SURFACE

1954 ◽  
Vol 32 (4) ◽  
pp. 388-398 ◽  
Author(s):  
A. Orzechowski ◽  
K. E. MacCormack
Keyword(s):  
Ethylene Oxide ◽  
Reaction Temperature ◽  
Catalyst Surface ◽  
Flow System ◽  
Catalyst Activity ◽  
Reference State ◽  
Silver Catalyst ◽  
Kinetic Measurements ◽  
Catalyzed Oxidation ◽  
Oxygen Atoms

In the silver catalyzed oxidation of ethylene or ethylene oxide (EtO), the silver catalyst activity measured under constant standard conditions in a flow system was found to be dependent on the conditions of previous catalyst treatment such as reaction temperature and reactant composition. The results are explained on the basis of slow establishment of equilibrium respecting fixation of stably sorbed oxygen atoms and surface products of oxidation. It is emphasized that in view of the slow processes observed, the kinetic measurements must be punctuated by frequent stabilizing check runs in order to maintain the catalyst in the same reference state.

The reactions of atomic oxygen with phosphorus and with phosphine

1968 ◽  
Vol 302 (1469) ◽  
pp. 243-252 ◽  
Keyword(s):  
Atomic Oxygen ◽  
Flow System ◽  
Bond Energies ◽  
Chain Reaction ◽  
Ultraviolet Emission ◽  
Discharge Flow ◽  
Mechanisms Of Formation

A discharge flow system has been used to study the stoichiometry and chemiluminescence of the reaction of atomic oxygen with phosphorus and with phosphine. Visible chemilumi­nescence in both reactions extending down to 3600 Å and ultraviolet emission in the O + PH 3 reaction are attributed respectively to the processes O + PO → PO 2 and OH + PO → HOPO. Bond energies of these species and the mechanisms of formation of excited PO are discussed. It is deduced that P and PO only play minor roles in the O + P 4 reaction and in the chain reaction between phosphorus and oxygen.

THE REACTION OF NITROGEN ATOMS WITH OXYGEN ATOMS IN THE ABSENCE OF OXYGEN MOLECULES

1961 ◽  
Vol 39 (8) ◽  
pp. 1601-1607 ◽  
Author(s):  
C. Mavroyannis ◽  
C. A. Winkler
Keyword(s):  
Nitric Oxide ◽  
Nitrogen Atom ◽  
Rate Constant ◽  
Rate Constants ◽  
Flow System ◽  
Titration Method ◽  
Active Nitrogen ◽  
Reaction Tube ◽  
Fast Flow ◽  
Oxygen Atoms

The reaction has been studied in a fast-flow system by introducing nitric oxide in the gas stream with excess active nitrogen. The nitrogen atom consumption was determined by titrating active nitrogen with nitric oxide at different positions along the reaction tube. The rate constant is found to be k1 = 1.83(± 0.2) × 1015 cc2 mole−2 sec−1 at pressures of 3, 3.5, and 4 mm, and with an unheated reaction tube.The homogeneous and surface decay of nitrogen atoms involved in the above system were studied using the nitric oxide titration method, and the rate constants were found to be k3 = 1.04 ± 0.17 × 1016 cc2 mole−2 sec−1, and k4 = 2.5 ± 0.2 sec−1 (γ = 7.5 ± 0.6 × 10–5), respectively, over the range of pressures from 0.5 to 4 mm with an unheated reaction tube.

Rates of elementary processes in the chain reaction between hydrogen and oxygen I. Reactions of oxygen atoms

1963 ◽  
Vol 275 (1363) ◽  
pp. 544-558 ◽  
Keyword(s):  
Rate Constant ◽  
Atomic Oxygen ◽  
Elevated Temperatures ◽  
Collision Frequency ◽  
Flow System ◽  
Chain Reaction ◽  
Elementary Processes ◽  
A Value ◽  
Good Agreement ◽  
Oxygen Atoms

The rates of reaction of 3 P oxygen atoms with hydroxyl and hydrogen have been measured in a flow system at pressures around 2 mmHg. The former reaction, O + OH -> H + O 2 , ( — 4) occurred in the products of the rapid reaction between H and NO 2 , and was followed by measurements of atomic oxygen concentrations. k -4 was found to be 5±2 x 10 -11 cm 3 molecule -1 s -1 at 265 and 293 °K. This result, when combined with data on the reverse reaction at elevated temperatures, gives a value of k -4 which is virtually independent of temperature and equal to about 1/20 of the bimolecular collision frequency. The reaction O + H 2 -> OH + H (3) was studied in the absence of molecular oxygen and found to have a rate constant of 6 x 10 -13 exp (-8900/ RT ) cm 3 molecule -1 s -1 in the range 409 to 733 °K. This is in good agreement with values obtained at higher temperatures. The rate constant for O + D 2 was significantly less than that for O + H 2 at temperatures between 491 and 671 °K.

Rate of Reaction of OH with HCN Between 298 and 563 K

1979 ◽  
Vol 32 (12) ◽  
pp. 2571 ◽  
Author(s):  
LF Phillips
Keyword(s):  
Numerical Integration ◽  
Rate Constant ◽  
Flow System ◽  
Rate Equations ◽  
Side Reactions ◽  
Resonance Fluorescence ◽  
Discharge Flow ◽  
Temperature Range ◽  
Rate Of Reaction ◽  
Estimated Error

Hyroxyl resonance fluorescence was used to study the reaction of OH with HCN in a discharge-flow system. The effect of side reactions involving OH was assessed by numerical integration of the rate equations for the system. The rate constant for the reaction: OH + HCN → products as measured at pressures above 10 Torr and under conditions where side reactions were believed to be unimportant, is given by the expression: k = 1.60 ° 10-11 T-1exp(-1.86 × 103/T) cm3 molecule -1 s-1 with an estimated error of � 20% over the temperature range from 298 to 563 K.

Ne Emissions from a He Discharge Flow System: I. Relative Transition Probabilities of Ne

1980 ◽  
Vol 35 (12) ◽  
pp. 1337-1341 ◽  
Author(s):  
H. K. Haak ◽  
C. Zetzsch ◽  
F. Stuhl
Keyword(s):  
Microwave Discharge ◽  
Transition Probabilities ◽  
Flow System ◽  
Theoretical Work ◽  
Discharge Flow ◽  
Line Intensities ◽  
Relative Transition

Abstract A windowless microwave discharge in He was used to generate Ne emissions in a flow system. Relative transition probabilities for a number of emission arrays were determined from the observed line intensities. Agreement is generally obtained with previous experimental and theoretical work.

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