The one-laser two-color resonance enhanced multiphoton ionization REMPI [(1+1’)+1] and velocity map imaging have been applied to investigate formation of molecular oxygen in excited singlet O₂(a¹Δ_g)$(a^1{\mathrm{\Delta }}_g)$ and ground O₂$(X^3{\mathrm{\Sigma }}_g^{-}$) states in the photodissociation of van der Waals complex isoprene-oxygen C₅H₈-O₂. These molecules were found to appear in the different rotational states with translational energy varied from a value as low as ∼1 meV to a distribution with temperature of about 940 K. The observed traces of electron recoil in the images of photoions reveal participation of several ionization pathways of the resonantly excited intermediate states of O₂.

一激光二色共振增强多光子电离REMPI [（1 + 1' ）+ 1]和速度影像已应用于调查形成分子氧的激发单Ô ₂ （A ¹ Δ_克）$（{\mathrm{一个}}^{\mathrm{1个}}{\mathrm{\Delta }}_G）$和地面O ₂$（X^3{\mathrm{\Sigma }}_G^{--}$）范德华配合物异戊二烯-氧C ₅ H ₈ -O ₂的光解状态。发现这些分子以不同的旋转状态出现，其平移能从低至约1 meV的值变化到约940 K的温度分布。在光离子图像中观察到的电子反冲痕迹显示出多次电离的参与。 O ₂的共振激发中间态的分子途径。