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One of my study books says '...the dipole-dipole measurement, which is a lateral second derivative measurement is the most sensitive to relatively small, lateral variations....'

I have a hard time to figure out why the author is talking about second-order derivative in this relation.

Thank you for help.

Jan

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See the section on Newtonian mechanics in this wiki entry: en.wikipedia.org/wiki/Molecular_vibration. I assume from the limited context of your question that you are talking about using spectroscopic methods to measure changes in molecular configurations. It might help to provide a bit more context. For example, what kind of measurement is concerned? – KDN Feb 17 at 17:21

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