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Strong and selective isotope effect in the vacuum ultraviolet photodissociation branching ratios of carbon monoxide

Author

Listed:
  • Pan Jiang

    (Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Xiaoping Chi

    (Institute of Chemistry, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Qihe Zhu

    (Institute of Chemistry, Chinese Academy of Sciences)

  • Min Cheng

    (Institute of Chemistry, Chinese Academy of Sciences)

  • Hong Gao

    (Institute of Chemistry, Chinese Academy of Sciences)

Abstract

Rare isotope (13C, 17O and 18O) substitutions can substantially change absorption line positions, oscillator strengths and photodissociation rates of carbon monoxide (CO) in the vacuum ultraviolet (VUV) region, which has been well accounted for in recent photochemical models for understanding the large isotopic fractionation effects that are apparent in carbon and oxygen in the solar system and molecular clouds. Here, we demonstrate a strong isotope effect associated with the VUV photodissociation of CO by measuring the branching ratios of 12C16O and 13C16O in the Rydberg 4p(2), 5p(0) and 5s(0) complex region. The measurements show that the quantum yields of electronically excited C atoms in the photodissociation of 13C16O are dramatically different from those of 12C16O, revealing strong isotope effect. This isotope effect strongly depends on specific quantum states of CO being excited, which implies that such effect must be considered in the photochemical models on a state by state basis.

Suggested Citation

  • Pan Jiang & Xiaoping Chi & Qihe Zhu & Min Cheng & Hong Gao, 2019. "Strong and selective isotope effect in the vacuum ultraviolet photodissociation branching ratios of carbon monoxide," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11086-z
    DOI: 10.1038/s41467-019-11086-z
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