Abstract
We developed an alternative method to measure force curves reproducibly by noncontact force spectroscopy for studying molecules. In this method, the force curve is collected without disabling the tip–sample distance feedback thereby in a non-destructive manner. The method can be used when the interaction force versus the tip–sample distance is monotonic and it is useful especially for measuring force curves on organic surfaces. We safely obtained the force curves, which are overlapped with those measured by the conventional method on graphite and lead-phthalocyanine samples in ultra high vacuum.
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