What does preëxponential mean?

preëxponential

Word Rarity Very rare

Frequency: Zipf frequency 0.00 in modern English

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adj

"In the equation s = W / A, where W = collision frequency per molecule, and A is taken as the Arrhenius preëxponential factor; s is the effective number of oscillators contributing to dissociation in the Kassel theory."
"They also gave the activation energies and preëxponential factors for the pigments which they studied."

How to pronounce preëxponential

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