Observed seasonal changes in Martian hydrogen chloride explained by heterogeneous chemistry

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Table D.1

Photolysis reactions of chlorine tracers used in the 1D photochemistry model.

Key	Reaction	Rate(s⁻¹) at 5.0 km	Rate (s⁻¹) at 69.5 km
j_HCl	HCl + hv → H + Cl	8.93E-8	8.22E-7
j_HOCl	HOCl + hv → OH + Cl	2.09E-4	2.80E-4
j_CIO	ClO + hv → Cl + O	2.37E-3	3.29E-3
$j_{C l_{2}}$ ${{\rm{j}}_{C{l_2}}}$	Cl₂ + hv → Cl + Cl	2.47E-3	2.75E-3
j_CIOO	ClOO + hv → ClO + O	6.46E-3	1.36E-2
j_OClO	OClO + hv → ClO + O	9.22E-2	1.02E-1
$j_{{Cl}_{2} O_{2}}$ ${{\rm{j}}_{{\rm{C}}{{\rm{l}}_2}{{\rm{O}}_2}}}$	Cl₂O₂ + hv → Cl + ClOO	3.87E-3	6.38E-3
$j_{C H_{3} OCl}$ ${{\rm{j}}_{C{H_3}{\rm{OCl}}}}$	CH₃OCl + hv → CH₃O + Cl	1.12E-4	1.59E-4
$j_{C H_{3} Cl}$ ${{\rm{j}}_{C{H_3}{\rm{Cl}}}}$	CH₃Cl +hv → 0.89CH₃ + O.89Cl + 0.11CH₂Cl + 0.11H	1.78E-7	7.16E-7

Rates are extracted for an atmosphere at perihelion (L_S = 251°) with solar zenith angle set to 60° and optical opacity at 7hPa of 0.2.

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