Journal article

Publication year: 1997

Pages: 177-184

Journal: Surface Science

Volume number: 376

Issue number: 1-3

DOI Link: https://doi.org/10.1016/S0039-6028(96)01335-0

Publisher: Elsevier

Abstract: 

The order-disorder phase transition of the Rh(111)-(√3 × √3)R30°-CO phase was investigated by He scattering. The critical temperature turned out to be 330 ± 5K, while the critical exponents are consistent with a phase transition belonging to the 3-state Potts universality class. The temperature dependence below the critical temperature of both CO phases was studied using elastic He scattering and LEED. These measurements demonstrate that a simple Debye-Waller evaluation of the diffraction data is not appropriate to provide information on the vibrational properties of the CO molecules. From LEED measurements at low temperatures (< 70K) and various CO partial pressures there is evidence of the formation of a disordered second CO layer in equilibrium with the gas phase. The isosteric heat of CO adsorption in the second layer is about 6 kJ mol−1.

Harvard Citation style: Over, H., Schwegmann, S., Ertl, G., Cvetko, D., De Renzi, V., Florano, L., et al. (1997) Temperature behavior of the (√3 × √3)R30°-1CO and the (2 × 2)-3CO overlayers on Rh(111): a combined HAS and LEED investigation, Surface Science, 376(1-3), pp. 177-184. https://doi.org/10.1016/S0039-6028(96)01335-0

APA Citation style: Over, H., Schwegmann, S., Ertl, G., Cvetko, D., De Renzi, V., Florano, L., Gotter, R., Morgante, A., Peloi, M., Tommasini, F., & Zennaro, S. (1997). Temperature behavior of the (√3 × √3)R30°-1CO and the (2 × 2)-3CO overlayers on Rh(111): a combined HAS and LEED investigation. Surface Science. 376(1-3), 177-184. https://doi.org/10.1016/S0039-6028(96)01335-0