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The study aims to determine the rate constant of the reaction HCl + M → H + Cl + M at high temperatures and pressures using shock tube techniques.

A Shock‐Tube Study of the HCl + M → H + Cl + M (M = Ar) Rate Constant Using HCl Laser Absorption Near 3.3 µm

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Experimental investigation measures HCl decomposition rate constant in argon, indicating high-temperature behavior.

The study aims to determine the rate constant of the reaction HCl + M → H + Cl + M at high temperatures and pressures using shock tube techniques.
Conducted pyrolysis of 0.5% HCl in argon behind reflected shock waves.
Utilized a laser to measure HCl's R(8) transition near 3.3 µm.
Analyzed temperatures from 2290 to 3490 K and pressures from 0.7 to 3.6 atm.
Isolated the reaction HCl + M to retrieve its rate constant from experimental data.
Measured bimolecular reaction rate constant under varying pressure conditions.
Defined pressure dependence of HCl decomposition between 1.5 atm and up to 3.6 atm.
Established a generalized equation for the unimolecular reaction HCl → H + Cl.

Grégoire et al. (2026) studied this question.

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