Modeling the structure of the dayside Venusian ionosphere: Impacts of protonation and Coulomb interaction

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Volume 685 (May 2024)

A&A, 685 (2024) A160

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Table A.1

Compilation of molecular diffusion coefficients*

Gas mixture	Diffusion coefficient cm² s⁻¹	Reference
Ar–CO₂	$17.6 T_{n}^{1.65} \exp (- 89.1 / T_{n}) / p_{{CO}_{2}}$ ${17.6T_n^{1.65}\exp \left( { - 89.1/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	Mason & Marrero (1970)
Ar–O	$7.61 T_{n}^{1.84} / p_{O}$ ${7.61T_n^{1.84}/{p_{\rm{O}}}}$	Mason & Marrero (1970)
O₂–CO₂	$15.8 T_{n}^{1.66} \exp (- 61.3 / T_{n}) / p_{{CO}_{2}}$ ${15.8T_n^{1.66}\exp \left( { - 61.3/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	Mason & Marrero (1970)
O₂–O	$17.9 T_{n}^{1.73} \exp (- 16.7 / T_{n}) / p_{O}$ $17.9T_n^{1.73}\exp \left( { - 16.7/{T_n}} \right)/{p_{\rm{O}}}$	García Muñoz (2007)
H₂–CO₂	$31.8 T_{n}^{1.75} \exp (- 11.7 / T_{n}) / p_{{CO}_{2}}$ ${31.8T_n^{1.75}\exp \left( { - 11.7/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	Mason & Marrero (1970)
H₂–O	$108 T_{n}^{1.63} \exp (- 22 / T_{n}) / p_{O}$ ${108T_n^{1.63}\exp \left( { - 22/{T_n}} \right)/{p_{\rm{O}}}}$	García Muñoz (2007)
H–CO₂	$74.4 T_{n}^{1.71} \exp (- 12 / T_{n}) / p_{{CO}_{2}}$ ${74.4T_n^{1.71}\exp \left( { - 12/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	García Muñoz (2007)
H–O	$100 T_{n}^{1.71} / p_{O}$ $100T_n^{1.71}/{p_{\rm{O}}}$	García Muñoz (2007)
NO–CO₂	$15.2 T_{n}^{1.67} \exp (- 42 / T_{n}) / p_{{CO}_{2}}$ ${15.2T_n^{1.67}\exp \left( { - 42/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	García Muñoz (2007)
NO–O	$33.8 T_{n}^{1.63} \exp (- 33 / T_{n}) / p_{O}$ ${33.8T_n^{1.63}\exp \left( { - 33/{T_n}} \right)/{p_{\rm{O}}}}$	García Muñoz (2007)
N–O	$21.3 T_{n}^{1.74} \exp (- 2 / T_{n}) / p_{O}$ ${21.3T_n^{1.74}\exp \left( { - 2/{T_n}} \right)/{p_{\rm{O}}}}$	García Muñoz (2007)
O–CO₂	$27.8 T_{n}^{1.63} \exp (- 48 / T_{n}) / p_{{CO}_{2}}$ ${27.8T_n^{1.63}\exp \left( { - 48/{T_n}} \right)/{p_{{\rm{C}}{{\rm{O}}_2}}}}$	García Muñoz (2007)

^* All values in the tabulated expressions are in Gaussian units: $p_{{CO}_{2}}$ ${p_{{\rm{C}}{{\rm{O}}_2}}}$ and p_O stand for the CO₂ and O partial pressures in dyns cm^–2, whereas T_n stands for the neutral temperature in K.

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