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In this study, we present C +  ion photofragment spectroscopic studies and photodissociation branching ratio measurements for two CO isotopologs,  13 C 16 O and  12 C 18 O, 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 of  12 C 16 O in the above energy region are reinvestigated up to higher rotational levels compared with previous studies. The results are compared among  12 C 16 O,  13 C 16 O, and  12 C 18 O on a state-by-state basis, and the photodissociation branching ratios for channels C( 1 D) + O( 3 P), and C( 3 P) + O( 1 D) are dramatically changed for most of the absorption bands due to the substitutions of  12 C by  13 C and  16 O by  18 O. The branching ratios of  13 C 16 O and  12 C 18 O 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.

astronomy and astrophysics

Photodissociation branching ratios of 13C16O and 12C18O in the vacuum ultraviolet region from 107 800 to 109 700 cm−1