Imaging of uncoated purple membrane by scanning tunneling microscopy

Guckenberger, R.; Hacker, B.; Hartmann, T.; Scheybani, T.; Wang, Z.; Wiegräbe, W.; Baumeister, W.

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Imaging of uncoated purple membrane by scanning tunneling microscopy

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Guckenberger, R., Hacker, B., Hartmann, T., Scheybani, T., Wang, Z., Wiegräbe, W., et al. (1991). Imaging of uncoated purple membrane by scanning tunneling microscopy. Journal of Vacuum Science & Technology B, 9(2), 1227-1230.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-743B-8

Abstract

Scanning tunneling microscopy images of uncoated purple membrane are easily obtained at tunneling currents lower than 1 pA and tunneling voltages above approximately 7 V. However, the images sometimes show positive, sometimes negative contrast. This effect appears to depend only on the shape of the tunneling tip. A simple model, assuming a constant voltage drop across the purple membrane, is proposed which can explain this observation. (13 References).