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A dagger with two crossbars, raised after a quantity.
Also known as: Activation symbol, Transition state marker, Double dagger in chemistry, Activation barrier symbol
The double dagger marks a quantity as belonging to the transition state — the highest point on the reaction path, which exists for a single vibration and cannot be isolated. ΔG‡ is the activation barrier, and it controls rate where ΔG controls direction.
Denotes a quantity relating to the transition state of a reaction, written as a raised double dagger.
Contexts: Laboratory
Marks the activation barrier when applied to a Gibbs energy change, which governs reaction rate rather than direction.
Contexts: Laboratory
Refers to a configuration that cannot be isolated: the transition state is a saddle point occupied for about one vibrational period.
Contexts: Laboratory
A vertical stroke crossed by two short horizontal bars, one near the top and one near the bottom, raised to the upper right of a quantity.