Vibrational analysis of the NH + N coadsorbate on Ru(0001)

Dietrich, Holger; Jacobi, Karl; Ertl, Gerhard

doi:10.1016/S0039-6028(96)01392-1

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Vibrational analysis of the NH + N coadsorbate on Ru(0001)

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Dietrich, Holger
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Jacobi, Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl, Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Dietrich, H., Jacobi, K., & Ertl, G. (1997). Vibrational analysis of the NH + N coadsorbate on Ru(0001). Surface Science, 377-379, 308-311. doi:10.1016/S0039-6028(96)01392-1.

Cite as: https://hdl.handle.net/21.11116/0000-0008-8039-7

Abstract

Using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS) we studied the thermal decomposition of NH₃ on the Ru(0001) surface. Exposing Ru(0001) to high doses of NH₃ at sample temperatures above the desorption temperature of NH₃ a thermally stabilized N + NH coadsorbate phase is formed in which a relatively large coverage of N + NH (θ_{N + NH}=0.47) can be achieved. In this phase NH is stable up to 460 K. The thermal destabilization is accompanied by a first-order desorption of hydrogen and nitrogen. The thermal stabilization is discussed taking into account the different work function changes upon NH and N adsorption. Within the N+NH phase the Ru-NH stretch mode intensity is very weak. Similarities with the Cs+CO system are discussed.