col (saddle point)

https://doi.org/10.1351/goldbook.C01145
A mountain-pass in a @[email protected] is known as a col or @[email protected] It is a point at which the @[email protected] is zero along all coordinates, and the curvature is positive along all but one coordinate, which is the @[email protected], along which the curvature is negative.
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 158 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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