Dynamics of the Eley-Rideal Reaction of D Atoms with H Atoms Adsorbed on Cu(111): Vibrational and Rotational State Distributions of the HD Product

We have determined the internal-state distribution for the HD product of the reaction of gas-phase D atoms with H atoms chemisorbed on Cu(111). The populations of the vibrational states $v=0\mathrm{}$, 1, 2, and 3 are comparable, while that for $v=4\mathrm{}$ is considerably smaller, giving a mean vibrational energy of $\sim 0.7$ eV. The mean rotational energy falls with increasing $v$, from $\sim 0.5$ eV for $v=0\mathrm{}$ to $<0.2\mathrm{}$ eV for $v=4\mathrm{}$, with an overall mean rotational energy of $\sim 0.4$ eV. The maximum internal energy observed is $\sim 2.3$ eV, consistent with the total energy available to the product. Results are compared with recent calculations.