The effect of vibrational excitation in the reactions of OH with H2

Reactions of OH radicals with inorganic compounds in the gas phase

“…In good agreement is the enhancement of k01/k00 = 155=k38 measured by Glass and Chaturvedi [41], using a DF-ESR apparatus with H2(v=l) produced by a low power microwave discharge in H2. These values are also consistent with an upper limit of k01/k00 ~ 800, estimated from experiments with vibrationally excited species by Light and Matsumoto [42], who also estimated an enhancement factor kll/k01 = 1.7 for the reaction of OH(v=I) with H2(v=l), i.e., similar to that for ground state H2. These results demonstrate experimentally that the rate of an atom exchange reaction, AB+CD --~ ABC+D, is enhanced more strongly by vibrational excitation of the broken bond (CD) than of the "spectator" bond (AB).…”

Plasma-assisted ignition and combustion

“…Model predicts the ratio k(v=1)/k(v=0) = 2795, which is in perfect agreement with experiments [Light& Matsumoto, 1978] (2600). Ratio of channels to OH(w=1) and OH(w=0) at T = 300 K estimated in ] is equal to k(w=1)/k(w=0) = 7.9, which also is in good agreement with experiments [Light& Matsumoto, 1978] (>2). The analysis of the reaction rate constant dependence on the vibrational excitation degree for reaction OH + H 2 (v)  H 2 O + H is shown on Figure 20,b.…”

“…The predictions of model are in a good agreement with calculations based on experimentally measured value of  = 0.24 [Fridman&Rusanov, 1985]. Work [Light& Matsumoto, 1978] gives an experimental estimation for ratio of the rate constants of processes OH + H 2 (v=0)  H 2 O + H and OH + H 2 (v=1)  H 2 O + H: k v=1 /k v=0 ≤ 1000 at T=298 K, which is in good agreement with the estimation by model [Zatsepin et al, 2001] shows the oxidation rate increase in H 2 -air mixture at T = 300K in 3-5 times. As an example of possible applications of vibrational excitation of the flow we will mention the paper [Bezgin et al, 2006].…”

“…It is shown in [Light& Matsumoto, 1978] that ratio of specific constants of the reaction rates at v=1 and v=0 is k(v=1)/k(v=0) = 2600 at T=300 K. The process at v=1 leads to formation of radical OH in vibrationaly excited state [Light& Matsumoto, 1978] H 2 (v=1) + O( 3 P)  H + OH(w=1) ( = . .…”

A molecular dynamics study of the reaction H2+OH→H2O+H

“…Brown et al, 1 determined ~ rate coefficient for the reac-. tion in low pr~ssure hyd~ogen/oxygen flame studies, ~nd Ravishankara et Mat's~moto 15 investigate~ the effect of vibrationally excited OH on the reaction.…”