Water Formation through a Quantum Tunneling Surface Reaction, OH + H2,
  at 10 K
  The present study experimentally demonstrated that solid H2O is formed
through the surface reaction OH + H2 at 10 K. This is the first experimental
evidence of solid H2O formation using hydrogen in its molecular form at
temperatures as low as 10 K. We further found that H2O formation through the
reaction OH + H2 is about one order of magnitude more effective than HDO
formation through the reaction OH + D2. This significant isotope effect results
from differences in the effective mass of each reaction, indicating that the
reactions proceed through quantum tunneling.
