摘要:In this study, we present C+ion photofragment spectroscopic studies and photodissociation branching ratio measurements for two CO isotopologs,13C16O and12C18O, in the vacuum ultraviolet (VUV) region from 107 800 cm−1(92.76 nm) to 109 700 cm−1(91.16 nm) using a time-slice velocity-map imaging setup and a tunable VUV laser radiation source generated by the two-photon resonance-enhanced four-wave mixing technique. Several absorption bands of12C16O in the above energy region are reinvestigated up to higher rotational levels compared with previous studies. The results are compared among12C16O,13C16O, and12C18O on a state-by-state basis, and the photodissociation branching ratios for channels C(1D) + O(3P), and C(3P) + O(1D) are dramatically changed for most of the absorption bands due to the substitutions of12C by13C and16O by18O. The branching ratios of13C16O and12C18O are close to each other due to their similar reduced masses. The strong and selective isotope effects obtained here not only provide useful information for understanding the complicated predissociation dynamics of CO, but are also important for developing a comprehensive photochemical model for explaining the C and O isotope heterogeneities as observed in the Solar System.
关键词:enastrochemistrymolecular dataSun: UV radiationISM: moleculesISM: kinematics and dynamicsphoton-dominated region