Abstract
The authors have analyzed the $^{13}\mathrm{C}$ spin-lattice relaxation of CO chemisorbed on supported Pt particles. They fit their relaxation data with a minimum set of relaxation times (${T}_{1}$) ranging from 0.009 to 6 s at 77 K. They find that each ${T}_{1}$ component is inversely proportional to the temperature, but that some ${T}_{1}$ components do not satisfy the Korringa relationship. They express the relaxation by conduction electrons in terms of tight-binding coefficients and evaluate the amount of mixing of the CO orbitals with the Pt conduction bands to account for the observed ${T}_{1}$. They also analyze data for CO on Ir and Pd.
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