Abstract

The D atom Rydberg tagging time-of-flight technique was applied to investigate the photodissociation dynamics of DNCO in the vacuum ultraviolet 133–137 nm region. The D atom product was detected and the corresponding product translational energy distributions and angular distributions were obtained. Three product channels, D + NCO(X2Π), D + NCO(A2Σ+) and D + NCO(B2Π), which arise from different dissociation pathways have been observed. It is found that the D + NCO(X2Π) channel involves two different dissociation pathways; one is via internal conversion from the excited state to the S0 state, and the other is via internal conversion from the excited state to the S1 state. The D + NCO(A2Σ+) channel was ascribed to be from dissociation on S2 surface, and the D + NCO(B2Π) channel possibly come from a relatively slow dissociation process. Vibrational structures observed in the D + NCO(A2Σ+) channel shows that there is dominant bending with a little stretching vibrational excitation of NCO(A2Σ+). This is consistent with what has been found in the previous study following VUV photodissociation of HNCO in a similar wavelength region.

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