CO adsorbed on MgO(100): a high resolution LEED study |
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Affiliation: | 1. Department of chemistry, School of Science, Gitam University, Hyderabad (TS) 502329, India,;2. Centre for Semio Chemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad (TS) 500076, India |
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Abstract: | The monolayer structure of CO molecules adsorbed on MgO(100) single crystal surfaces cleaved in situ has been analysed by LEED within the 30–56 K temperature range. At T ⩽ 40 K CO forms a 2 × 4 commensurate 2D solid phase. A sharp uniaxial transition occurs above this temperature, along the [10] surface direction which locks the monolayer into a new commensurate 2 × 3 phase stable over a temperature range of 8 K. Above 50 K, this second commensurate phase expands itself uniaxially in a sharp transition toward a solid with disorder increasing with temperature. This succession of transitions is an interesting illustration of the incomplete “devil's staircase”. |
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