Research ArticlePLANETARY SCIENCE

Isomer-specific kinetics of the C+ + H2O reaction at the temperature of interstellar clouds

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Science Advances  06 Jan 2021:
Vol. 7, no. 2, eabe4080
DOI: 10.1126/sciadv.abe4080
  • Fig. 1 Measurement of the reaction rate and isomeric branching ratio.

    (A) Schematic diagram of the experimental setup. MCP, Micro-channel Plate. (B) Time-of-flight trace (10 sample average) of Be+ and C+ exposed to water from the CBGB and 15N2 from the leak valve (10 s) at a density of 1 × 109 cm−3. amu, atomic mass units. (C) The fraction of the titrated isomers saturating as a function of 15N2 density. Fitted parameters yield a ratio of trapped reaction products of 1.4(2) and k3 = ((6.6 ± 1.0) × 10−10) cm3/s. (D) Same as (B), but with 20 s of C+ + H2O reaction and isomerization via CO introduced as a background gas before titration with N2. The lack of a peak for 15N2H+ indicates that the CO has converted all of the HOC+ to HCO+ and that HOC+ does not react with N2.

  • Fig. 2 Energetics of the ground-state reaction pathways for the C+ + H2O reaction.

    The relative energies are marked, along with the ZPE (Zero Point Energy)–corrected values (italic and underlined) in kilocalorie per mole.

Supplementary Materials

  • Supplementary Materials

    Isomer-specific kinetics of the C+ + H2O reaction at the temperature of interstellar clouds

    Tiangang Yang, Anyang Li, Gary K. Chen, Qian Yao, Arthur G. Suits, Hua Guo, Eric R. Hudson, Wesley C. Campbell

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