Astrochemical effect of the fundamental grain surface processes - I. The diffusion of grain surface species and the pre-exponential factor

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Volume 685 (May 2024)

A&A, 685 (2024) A55

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Table 1

Desorption energy (E_des) and diffusion barrier (E_dif) of the species obtained from experiments.

Species	E_des (K)	E_dif (K)	Reference
H	650	230	Cuppen & Herbst (2007)
H₂	440	220	Cuppen & Herbst (2007)
CO	1600	490	He et al. (2018)
N₂	1320	447	He et al. (2018)
O₂	1520	446	He et al. (2018)
CH₄	1600	547	He et al. (2018)
H₂CO	2980	–^(a)	He et al. (2022)
CH₃OH	4400	–	He et al. (2022)
CO₂	2600	1300	Wakelam et al. (2017); He et al. (2023)
HCO	2290^(b)	–
CH₂OH	3750^(c)	–
CH₃O	3630^(d)	–

Notes. ^(a)Determined by the E_dif/E_des ratio. ^(b)Calculated from the desorption energy of CO and $H_{2} CO : (E_{des, CO} + E_{des, H_{2} CO}) / 2$ ${\rm{H}}:\left( {{E_{{\rm{des}},{\rm{C}}{{\rm{H}}_3}{\rm{OH}}}}\,\,{\rm{ - }}\,\,{E_{{\rm{des}},{\rm{H}}}}} \right)/2$ . ^(c) Calculated from the desorption energy of CH₃OH and $H : (E_{des, {CH}_{3} OH} + E_{des, H}) / 2$ ${\rm{H}}:\left( {{E_{{\rm{des}},{{\rm{H}}_2}{\rm{Co}}}} + {E_{{\rm{des}},{\rm{H}}}}} \right)/2$ . ^(d)Calculated from the desorption energy of H₂CO and $H : (E_{des, H_{2} CO} - E_{des, H}) / 2$ ${{\rm{H}}_2}{\rm{CO}}:\left( {{E_{{\rm{des}},{\rm{CO}}}} + {E_{{\rm{des}},{{\rm{H}}_2}{\rm{Co}}}}} \right)/2$ .

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