Reaction of hydroiodic acid with a chlorine atom in the temperature range of 298–366 K

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Abstract

In this study, the rate constant of the reaction between hydroiodic acid and a chlorine atom was measured using the resonance fluorescence (RF) method in a flow reactor within the temperature range of 298–366 K. Measurements were performed by detecting the RF of both chlorine atoms and iodine atoms, the latter being a product of this reaction. In both cases, similar expressions describing the temperature dependence of the rate constant were obtained. A possible explanation for the observed decrease in the reaction rate constant with increasing temperature in the reactor is proposed.

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About the authors

I. K. Larin

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: eltrofimova@yandex.ru
Russian Federation, Moscow

G. B. Pronchev

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Email: eltrofimova@yandex.ru
Russian Federation, Moscow

E. M. Trofimova

Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences

Author for correspondence.
Email: eltrofimova@yandex.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Flow reactor diagram.

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3. Fig. 2. Dependence of the logarithm of the ratio of RF signals of chlorine atoms, ln(J₀/J), on the concentration of [HI] in reaction (1). Temperature T = 365 K, pressure P = 0.8 Torr, reaction time t = 0.0108 s.

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4. Fig. 3. Temperature dependence of the reaction rate constant (1), obtained by measuring the RF signal of Cl atoms.

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5. Fig. 4. Dependence of the RF signal of iodine atoms on the [HI] concentration. Temperature T = 365 K, pressure P = 1.0 Torr, reaction time t = 0.0091 s.

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6. Fig. 5. Dependence of the logarithm of the ratio obtained from the RF signals of iodine atoms ln[Jmax/(Jmax – J)] on the [HI] concentration. Temperature T = 365 K, pressure P = 1.1 Torr, reaction time t = 0.0088 s.

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7. Fig. 6. Temperature dependence of the reaction rate constant (1), obtained by measuring the RF signal of I atoms.

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