Recombination of hydrogen atoms in the presence of atmospheric gases

Abstract

A calorimetric technique has been used to determine the rate constants of the reactions : H+H+M = H2+M, H+02+M = H02+M, in discharge flow experiments. The mechanism of the decay of hydrogen and of oxygen atoms under conditions when [HI -g [0]< [02], [MI is discussed.

A flash photolysis‐resonance fluorescence study of the reaction of atomic hydrogen with molecular oxygen H + O2 + M → HO2 + M

“…I n the investigation by Larkin and Thrush [7] the third body Ar gave a rate constant =%yo higher than that observed in our work at 300°K.…”

“…These secondary reactions could have results from the very low ratios of 0 2 : H that were employed in the discharge-flow study by Larkin and Thrush [7] compared to this work.…”

“…In two of the earliest experiments on this system, Clyne and Thrush [3] and Larkin and Thrush [7] used discharge flow systems in which H atoms were produced by an electrodeless discharge in low pressures of pure H z or H z carrier gas mixtures. In the work of Only those kinetic studies of the H + 0 2 + M system in the vicinity of room temperature or below have been listed here, the high-temperature work by several investigators being reviewed by Baulch et al…”

Dynamics Study of the H + ArO2 Multichannel Reaction

“…A 98 k a B98 k b C (12) f(t) ) f A + f B ) ( f B 0 -k a f A 0 k bk a ) exp(-k b t) + ( k a f A 0 k bk a + f A 0 ) exp(-k a t) (13) cross sections for formation of stable HO 2 molecules have been shown to deacrease with increasing translational energy. In contrast, the opacity functions for the reaction H + ArO 2 f O 2 + H + Ar have been shown to have a maximum for impact parameters around zero, which indicates that head-on collisions with argon favor O 2 formation.…”

“…Regarding the high-temperature rate coefficient measurements, most studies have been obtained from shock tube or flame data using argon as the third body. [7][8][9][10][11] At 300 K, the available kinetic studies for the title reaction consist of scattered experiments using both direct [12][13][14][15][16][17][18] and indirect (see ref 3 and references therein) techniques. More recently, Carleton et al 2 have carried out studies using several third bodies, which include N 2 at 298 -580 K, H 2 O at 575-750 K, and Ar at 298 K.…”