Based on our experimental studies of the simultaneous

O^{+}

and

H^{+}

irradiation of graphite, symbolically represented as the

O^{+} - H^{+} \to C

reaction system, we have developed a semiempirical kinetic model for describing the reactions leading to the formation of the reaction products

{CH}_{4},

CO,

{CO}_{2},

and

H_{2} O .

The model builds on previously proposed concepts for methane formation via intermediate precursor generation and a “two-region” description of the graphite microstructure. These concepts have been extended to include intermediate precursor-containing steps for the formation of CO,

{CO}_{2},

and

H_{2} O,

and the breakup of

{CH}_{4}

by the incident ions. Model predictions of the flux and energy dependence of the

{CH}_{4},

CO, and

{CO}_{2}

yields were generally in good agreement with experimental results for the

H^{+} \to C

and

O^{+} \to C

reactions. For the

O^{+} - H^{+} \to C

reaction, the model agrees quite well with the flux ratio dependence of the

H_{2} O

yield and the corresponding reductions in the CO,

{CO}_{2},

and

{CH}_{4}

yields.

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