Temporal evolution of the mixing ratio of syn,cis−HO−ĊH−CH=O (syn,cis-R₂), syn,cis−O=Ċ−CH₂−OH (syn,cis-R₄), $\dot{\mathrm{O}}$−CH₂−CH₂−OH (R₆), CO, HĊ=O, H₂C=O, and H₂Ċ−OH in the experiment of gylcolaldehyde (GA) + H reaction. The vertical lines refer to the end of the 2217 nm NIR irradiation. The horizontal lines refer to the quantity of the species at the end of the 2217 nm NIR irradiation.