Michael Mehlhorn and Karina Morgenstern 2009 New J. Phys. 11 093015 doi:10.1088/1367-2630/11/9/093015
Height analysis of amorphous and crystalline ice structures on Cu(111) in scanning tunneling microscopy
Michael Mehlhorn and Karina Morgenstern1
Show affiliationsScanning tunneling microscopy imaging of amorphous and crystalline D2O ice on Cu(111) is discussed with respect to the apparent and the real heights of these structures above the metal surface. The apparent height increases linearly below the conduction band onset of amorphous ice and the first image state of crystalline ice, respectively. However, it largely underestimates the real height. For these voltages, histograms of the apparent height can be used to identify different layers. The dependence of the apparent height on voltage increases step-like up to the real height at the onsets of the first unoccupied electronic state. Apparent height spectroscopy is utilized to relate the apparent height to the real height of the different structures. The analysis reveals the layering during growth of porous amorphous ice between 0.1 and 1.4 BL and the dynamics of crystallization between 130 and 145 K.
- PACS
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68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
61.43.Gt Powders, porous materials
73.20.At Surface states, band structure, electron density of states
- Subjects
- Dates
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Issue 9 (September 2009)
Received 2 July 2009
Published 15 September 2009
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Height analysis of amorphous and crystalline ice structures on Cu(111) in scanning tunneling microscopy
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